The remote Debian 12 / 13 host has packages installed that are affected by multiple vulnerabilities as referenced in the dsa-6179 advisory.

    - -------------------------------------------------------------------------     Debian Security Advisory DSA-6179-1                   security@debian.org     https://www.debian.org/security/                     Salvatore Bonaccorso     March 26, 2026                        https://www.debian.org/security/faq
    - -------------------------------------------------------------------------

    Package        : thunderbird     CVE ID         : CVE-2025-59375 CVE-2026-3889 CVE-2026-4371 CVE-2026-4684                      CVE-2026-4685 CVE-2026-4686 CVE-2026-4687 CVE-2026-4688                      CVE-2026-4689 CVE-2026-4690 CVE-2026-4691 CVE-2026-4692                      CVE-2026-4693 CVE-2026-4694 CVE-2026-4695 CVE-2026-4696                      CVE-2026-4697 CVE-2026-4698 CVE-2026-4699 CVE-2026-4700                      CVE-2026-4701 CVE-2026-4702 CVE-2026-4704 CVE-2026-4705                      CVE-2026-4706 CVE-2026-4707 CVE-2026-4708 CVE-2026-4709                      CVE-2026-4710 CVE-2026-4713 CVE-2026-4714 CVE-2026-4715                      CVE-2026-4716 CVE-2026-4717 CVE-2026-4718 CVE-2026-4719                      CVE-2026-4720 CVE-2026-4721

    Multiple security issues were discovered in Thunderbird, which could     result in the execution of arbitrary code or information disclosure.

    For the oldstable distribution (bookworm), these problems have been     fixed in version 1:140.9.0esr-1~deb12u1.

    For the stable distribution (trixie), these problems have been fixed in     version 1:140.9.0esr-1~deb13u1.

    We recommend that you upgrade your thunderbird packages.

    For the detailed security status of thunderbird please refer to its     security tracker page at:
    https://security-tracker.debian.org/tracker/thunderbird

    Further information about Debian Security Advisories, how to apply     these updates to your system and frequently asked questions can be     found at: https://www.debian.org/security/

    Mailing list: debian-security-announce@lists.debian.org

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Debian 11 host has packages installed that are affected by multiple vulnerabilities as referenced in the dla-4510 advisory.

    - -------------------------------------------------------------------------     Debian LTS Advisory DLA-4510-1                debian-lts@lists.debian.org     https://www.debian.org/lts/security/               Emilio Pozuelo Monfort     March 26, 2026                                https://wiki.debian.org/LTS
    - -------------------------------------------------------------------------

    Package        : firefox-esr     Version        : 140.9.0esr-1~deb11u1     CVE ID         : CVE-2025-59375 CVE-2026-4684 CVE-2026-4685 CVE-2026-4686                      CVE-2026-4687 CVE-2026-4688 CVE-2026-4689 CVE-2026-4690                      CVE-2026-4691 CVE-2026-4692 CVE-2026-4693 CVE-2026-4694                      CVE-2026-4695 CVE-2026-4696 CVE-2026-4697 CVE-2026-4698                      CVE-2026-4699 CVE-2026-4700 CVE-2026-4701 CVE-2026-4702                      CVE-2026-4704 CVE-2026-4705 CVE-2026-4706 CVE-2026-4707                      CVE-2026-4708 CVE-2026-4709 CVE-2026-4710 CVE-2026-4713                      CVE-2026-4714 CVE-2026-4715 CVE-2026-4716 CVE-2026-4717                      CVE-2026-4718 CVE-2026-4719 CVE-2026-4720 CVE-2026-4721

    Multiple security issues have been found in the Mozilla Firefox web     browser, which could potentially result in the execution of arbitrary     code, sandbox escape, information disclosure, denial of service or     privilege escalation.

    For Debian 11 bullseye, these problems have been fixed in version     140.9.0esr-1~deb11u1.

    We recommend that you upgrade your firefox-esr packages.

    For the detailed security status of firefox-esr please refer to     its security tracker page at:
    https://security-tracker.debian.org/tracker/firefox-esr

    Further information about Debian LTS security advisories, how to apply     these updates to your system and frequently asked questions can be     found at: https://wiki.debian.org/LTS

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2026-1554 advisory.

    LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable     Network Graphics) raster image files. In versions 1.2.1 through 1.6.55, `png_set_tRNS` and `png_set_PLTE`     each alias a heap-allocated buffer between `png_struct` and `png_info`, sharing a single allocation across     two structs with independent lifetimes. The `trans_alpha` aliasing has been present since at least libpng     1.0, and the `palette` aliasing since at least 1.2.1. Both affect all prior release lines `png_set_tRNS`     sets `png_ptr->trans_alpha = info_ptr->trans_alpha` (256-byte buffer) and `png_set_PLTE` sets     `info_ptr->palette = png_ptr->palette` (768-byte buffer). In both cases, calling `png_free_data` (with     `PNG_FREE_TRNS` or `PNG_FREE_PLTE`) frees the buffer through `info_ptr` while the corresponding `png_ptr`     pointer remains dangling. Subsequent row-transform functions dereference and, in some code paths, write to     the freed memory. A second call to `png_set_tRNS` or `png_set_PLTE` has the same effect, because both     functions call `png_free_data` internally before reallocating the `info_ptr` buffer. Version 1.6.56 fixes     the issue.

    NOTE: https://github.com/pnggroup/libpng/security/advisories/GHSA-m4pc-p4q3-4c7jNOTE:
    https://github.com/pnggroup/libpng/pull/824NOTE: Fixed by:
    https://github.com/pnggroup/libpng/commit/23019269764e35ed8458e517f1897bd3c54820eb (v1.6.56)NOTE: Fixed     by: https://github.com/pnggroup/libpng/commit/a3a21443ed12bfa1ef46fa0d4fb2b74a0fa34a25 (v1.6.56)NOTE:
    Fixed by: https://github.com/pnggroup/libpng/commit/7ea9eea884a2328cc7fdcb3c0c00246a50d90667     (v1.6.56)NOTE: Fixed by:
    https://github.com/pnggroup/libpng/commit/c1b0318b393c90679e6fa5bc1d329fd5d5012ec1 (v1.6.56)     (CVE-2026-33416)

    LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable     Network Graphics) raster image files. In versions 1.6.36 through 1.6.55, an out-of-bounds read and write     exists in libpng's ARM/AArch64 Neon-optimized palette expansion path. When expanding 8-bit paletted rows     to RGB or RGBA, the Neon loop processes a final partial chunk without verifying that enough input pixels     remain. Because the implementation works backward from the end of the row, the final iteration     dereferences pointers before the start of the row buffer (OOB read) and writes expanded pixel data to the     same underflowed positions (OOB write). This is reachable via normal decoding of attacker-controlled PNG     input if Neon is enabled. Version 1.6.56 fixes the issue.

    NOTE: https://github.com/pnggroup/libpng/security/advisories/GHSA-wjr5-c57x-95m2NOTE: Introduced with:
    https://github.com/pnggroup/libpng/commit/7734cda20cf1236aef60f3bbd2267c97bbb40869 (v1.6.36)NOTE: Fixed     by: https://github.com/pnggroup/libpng/commit/aba9f18eba870d14fb52c5ba5d73451349e339c3 (v1.6.56)     (CVE-2026-33636)

    Race condition, use-after-free in the Graphics: WebRender component. This vulnerability affects Firefox <     149, Firefox ESR < 115.34, and Firefox ESR < 140.9. (CVE-2026-4684)

    Incorrect boundary conditions in the Graphics: Canvas2D component. This vulnerability affects Firefox <     149, Firefox ESR < 115.34, and Firefox ESR < 140.9. (CVE-2026-4685)

    Incorrect boundary conditions in the Graphics: Canvas2D component. This vulnerability affects Firefox <     149, Firefox ESR < 115.34, and Firefox ESR < 140.9. (CVE-2026-4686)

    Sandbox escape due to incorrect boundary conditions in the Telemetry component. This vulnerability affects     Firefox < 149, Firefox ESR < 115.34, and Firefox ESR < 140.9. (CVE-2026-4687)

    Sandbox escape due to use-after-free in the Disability Access APIs component. This vulnerability affects     Firefox < 149 and Firefox ESR < 140.9. (CVE-2026-4688)

    Sandbox escape due to incorrect boundary conditions, integer overflow in the XPCOM component. This     vulnerability affects Firefox < 149, Firefox ESR < 115.34, and Firefox ESR < 140.9. (CVE-2026-4689)

    Sandbox escape due to incorrect boundary conditions, integer overflow in the XPCOM component. This     vulnerability affects Firefox < 149, Firefox ESR < 115.34, and Firefox ESR < 140.9. (CVE-2026-4690)

    Use-after-free in the CSS Parsing and Computation component. This vulnerability affects Firefox < 149,     Firefox ESR < 115.34, and Firefox ESR < 140.9. (CVE-2026-4691)

    Sandbox escape in the Responsive Design Mode component. This vulnerability affects Firefox < 149, Firefox     ESR < 115.34, and Firefox ESR < 140.9. (CVE-2026-4692)

    Incorrect boundary conditions in the Audio/Video: Playback component. This vulnerability affects Firefox <     149, Firefox ESR < 115.34, and Firefox ESR < 140.9. (CVE-2026-4693)

    Incorrect boundary conditions, integer overflow in the Graphics component. This vulnerability affects     Firefox < 149, Firefox ESR < 115.34, and Firefox ESR < 140.9. (CVE-2026-4694)

    Incorrect boundary conditions in the Audio/Video: Web Codecs component. This vulnerability affects Firefox     < 149 and Firefox ESR < 140.9. (CVE-2026-4695)

    Use-after-free in the Layout: Text and Fonts component. This vulnerability affects Firefox < 149, Firefox     ESR < 115.34, and Firefox ESR < 140.9. (CVE-2026-4696)

    Incorrect boundary conditions in the Audio/Video: Web Codecs component. This vulnerability affects Firefox     < 149 and Firefox ESR < 140.9. (CVE-2026-4697)

    JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability affects Firefox < 149,     Firefox ESR < 115.34, and Firefox ESR < 140.9. (CVE-2026-4698)

    Incorrect boundary conditions in the Layout: Text and Fonts component. This vulnerability affects Firefox     < 149, Firefox ESR < 115.34, and Firefox ESR < 140.9. (CVE-2026-4699)

    Mitigation bypass in the Networking: HTTP component. This vulnerability affects Firefox < 149 and Firefox     ESR < 140.9. (CVE-2026-4700)

    Use-after-free in the JavaScript Engine component. This vulnerability affects Firefox < 149 and Firefox     ESR < 140.9. (CVE-2026-4701)

    JIT miscompilation in the JavaScript Engine component. This vulnerability affects Firefox < 149 and     Firefox ESR < 140.9. (CVE-2026-4702)

    Denial-of-service in the WebRTC: Signaling component. This vulnerability affects Firefox < 149 and Firefox     ESR < 140.9. (CVE-2026-4704)

    Undefined behavior in the WebRTC: Signaling component. This vulnerability affects Firefox < 149 and     Firefox ESR < 140.9. (CVE-2026-4705)

    Incorrect boundary conditions in the Graphics: Canvas2D component. This vulnerability affects Firefox <     149, Firefox ESR < 115.34, and Firefox ESR < 140.9. (CVE-2026-4706)

    Incorrect boundary conditions in the Graphics: Canvas2D component. This vulnerability affects Firefox <     149, Firefox ESR < 115.34, and Firefox ESR < 140.9. (CVE-2026-4707)

    Incorrect boundary conditions in the Graphics component. This vulnerability affects Firefox < 149 and     Firefox ESR < 140.9. (CVE-2026-4708)

    Incorrect boundary conditions in the Audio/Video: GMP component. This vulnerability affects Firefox < 149,     Firefox ESR < 115.34, and Firefox ESR < 140.9. (CVE-2026-4709)

    Incorrect boundary conditions in the Audio/Video component. This vulnerability affects Firefox < 149 and     Firefox ESR < 140.9. (CVE-2026-4710)

    Use-after-free in the Widget: Cocoa component. This vulnerability affects Firefox < 149 and Firefox ESR <     140.9. (CVE-2026-4711)

    Information disclosure in the Widget: Cocoa component. This vulnerability affects Firefox < 149 and     Firefox ESR < 140.9. (CVE-2026-4712)

    Incorrect boundary conditions in the Graphics component. This vulnerability affects Firefox < 149 and     Firefox ESR < 140.9. (CVE-2026-4713)

    Incorrect boundary conditions in the Audio/Video component. This vulnerability affects Firefox < 149 and     Firefox ESR < 140.9. (CVE-2026-4714)

    Uninitialized memory in the Graphics: Canvas2D component. This vulnerability affects Firefox < 149 and     Firefox ESR < 140.9. (CVE-2026-4715)

    Incorrect boundary conditions, uninitialized memory in the JavaScript Engine component. This vulnerability     affects Firefox < 149 and Firefox ESR < 140.9. (CVE-2026-4716)

    Privilege escalation in the Netmonitor component. This vulnerability affects Firefox < 149 and Firefox ESR     < 140.9. (CVE-2026-4717)

    Undefined behavior in the WebRTC: Signaling component. This vulnerability affects Firefox < 149 and     Firefox ESR < 140.9. (CVE-2026-4718)

    Incorrect boundary conditions in the Graphics: Text component. This vulnerability affects Firefox < 149     and Firefox ESR < 140.9. (CVE-2026-4719)

    Memory safety bugs present in Firefox ESR 140.8, Thunderbird ESR 140.8, Firefox 148 and Thunderbird 148.
    Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of     these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 149 and     Firefox ESR < 140.9. (CVE-2026-4720)

    Memory safety bugs present in Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird ESR 140.8, Firefox 148     and Thunderbird 148. Some of these bugs showed evidence of memory corruption and we presume that with     enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects     Firefox < 149, Firefox ESR < 115.34, and Firefox ESR < 140.9. (CVE-2026-4721)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of thunderbird installed on the remote host is prior to 140.9.0-1. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2-2026-3241 advisory.

    LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable     Network Graphics) raster image files. In versions 1.2.1 through 1.6.55, `png_set_tRNS` and `png_set_PLTE`     each alias a heap-allocated buffer between `png_struct` and `png_info`, sharing a single allocation across     two structs with independent lifetimes. The `trans_alpha` aliasing has been present since at least libpng     1.0, and the `palette` aliasing since at least 1.2.1. Both affect all prior release lines `png_set_tRNS`     sets `png_ptr->trans_alpha = info_ptr->trans_alpha` (256-byte buffer) and `png_set_PLTE` sets     `info_ptr->palette = png_ptr->palette` (768-byte buffer). In both cases, calling `png_free_data` (with     `PNG_FREE_TRNS` or `PNG_FREE_PLTE`) frees the buffer through `info_ptr` while the corresponding `png_ptr`     pointer remains dangling. Subsequent row-transform functions dereference and, in some code paths, write to     the freed memory. A second call to `png_set_tRNS` or `png_set_PLTE` has the same effect, because both     functions call `png_free_data` internally before reallocating the `info_ptr` buffer. Version 1.6.56 fixes     the issue.

    NOTE: https://github.com/pnggroup/libpng/security/advisories/GHSA-m4pc-p4q3-4c7jNOTE:
    https://github.com/pnggroup/libpng/pull/824NOTE: Fixed by:
    https://github.com/pnggroup/libpng/commit/23019269764e35ed8458e517f1897bd3c54820eb (v1.6.56)NOTE: Fixed     by: https://github.com/pnggroup/libpng/commit/a3a21443ed12bfa1ef46fa0d4fb2b74a0fa34a25 (v1.6.56)NOTE:
    Fixed by: https://github.com/pnggroup/libpng/commit/7ea9eea884a2328cc7fdcb3c0c00246a50d90667     (v1.6.56)NOTE: Fixed by:
    https://github.com/pnggroup/libpng/commit/c1b0318b393c90679e6fa5bc1d329fd5d5012ec1 (v1.6.56)     (CVE-2026-33416)

    LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable     Network Graphics) raster image files. In versions 1.6.36 through 1.6.55, an out-of-bounds read and write     exists in libpng's ARM/AArch64 Neon-optimized palette expansion path. When expanding 8-bit paletted rows     to RGB or RGBA, the Neon loop processes a final partial chunk without verifying that enough input pixels     remain. Because the implementation works backward from the end of the row, the final iteration     dereferences pointers before the start of the row buffer (OOB read) and writes expanded pixel data to the     same underflowed positions (OOB write). This is reachable via normal decoding of attacker-controlled PNG     input if Neon is enabled. Version 1.6.56 fixes the issue.

    NOTE: https://github.com/pnggroup/libpng/security/advisories/GHSA-wjr5-c57x-95m2NOTE: Introduced with:
    https://github.com/pnggroup/libpng/commit/7734cda20cf1236aef60f3bbd2267c97bbb40869 (v1.6.36)NOTE: Fixed     by: https://github.com/pnggroup/libpng/commit/aba9f18eba870d14fb52c5ba5d73451349e339c3 (v1.6.56)     (CVE-2026-33636)

    Spoofing issue in Thunderbird. This vulnerability affects Thunderbird < 149 and Thunderbird < 140.9.
    (CVE-2026-3889)

    A malicious mail server could send malformed strings with negative lengths, causing the parser to read     memory outside the buffer. If a mail server or connection to a mail server were compromised, an attacker     could cause the parser to malfunction, potentially crashing Thunderbird or leaking sensitive data. This     vulnerability affects Thunderbird < 149 and Thunderbird < 140.9. (CVE-2026-4371)

    Race condition, use-after-free in the Graphics: WebRender component. This vulnerability affects Firefox <     149, Firefox ESR < 115.34, and Firefox ESR < 140.9. (CVE-2026-4684)

    Incorrect boundary conditions in the Graphics: Canvas2D component. This vulnerability affects Firefox <     149, Firefox ESR < 115.34, and Firefox ESR < 140.9. (CVE-2026-4685)

    Incorrect boundary conditions in the Graphics: Canvas2D component. This vulnerability affects Firefox <     149, Firefox ESR < 115.34, and Firefox ESR < 140.9. (CVE-2026-4686)

    Sandbox escape due to incorrect boundary conditions in the Telemetry component. This vulnerability affects     Firefox < 149, Firefox ESR < 115.34, and Firefox ESR < 140.9. (CVE-2026-4687)

    Sandbox escape due to use-after-free in the Disability Access APIs component. This vulnerability affects     Firefox < 149 and Firefox ESR < 140.9. (CVE-2026-4688)

    Sandbox escape due to incorrect boundary conditions, integer overflow in the XPCOM component. This     vulnerability affects Firefox < 149, Firefox ESR < 115.34, and Firefox ESR < 140.9. (CVE-2026-4689)

    Sandbox escape due to incorrect boundary conditions, integer overflow in the XPCOM component. This     vulnerability affects Firefox < 149, Firefox ESR < 115.34, and Firefox ESR < 140.9. (CVE-2026-4690)

    Use-after-free in the CSS Parsing and Computation component. This vulnerability affects Firefox < 149,     Firefox ESR < 115.34, and Firefox ESR < 140.9. (CVE-2026-4691)

    Sandbox escape in the Responsive Design Mode component. This vulnerability affects Firefox < 149, Firefox     ESR < 115.34, and Firefox ESR < 140.9. (CVE-2026-4692)

    Incorrect boundary conditions in the Audio/Video: Playback component. This vulnerability affects Firefox <     149, Firefox ESR < 115.34, and Firefox ESR < 140.9. (CVE-2026-4693)

    Incorrect boundary conditions, integer overflow in the Graphics component. This vulnerability affects     Firefox < 149, Firefox ESR < 115.34, and Firefox ESR < 140.9. (CVE-2026-4694)

    Incorrect boundary conditions in the Audio/Video: Web Codecs component. This vulnerability affects Firefox     < 149 and Firefox ESR < 140.9. (CVE-2026-4695)

    Use-after-free in the Layout: Text and Fonts component. This vulnerability affects Firefox < 149, Firefox     ESR < 115.34, and Firefox ESR < 140.9. (CVE-2026-4696)

    Incorrect boundary conditions in the Audio/Video: Web Codecs component. This vulnerability affects Firefox     < 149 and Firefox ESR < 140.9. (CVE-2026-4697)

    JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability affects Firefox < 149,     Firefox ESR < 115.34, and Firefox ESR < 140.9. (CVE-2026-4698)

    Incorrect boundary conditions in the Layout: Text and Fonts component. This vulnerability affects Firefox     < 149, Firefox ESR < 115.34, and Firefox ESR < 140.9. (CVE-2026-4699)

    Mitigation bypass in the Networking: HTTP component. This vulnerability affects Firefox < 149 and Firefox     ESR < 140.9. (CVE-2026-4700)

    Use-after-free in the JavaScript Engine component. This vulnerability affects Firefox < 149 and Firefox     ESR < 140.9. (CVE-2026-4701)

    JIT miscompilation in the JavaScript Engine component. This vulnerability affects Firefox < 149 and     Firefox ESR < 140.9. (CVE-2026-4702)

    Denial-of-service in the WebRTC: Signaling component. This vulnerability affects Firefox < 149 and Firefox     ESR < 140.9. (CVE-2026-4704)

    Undefined behavior in the WebRTC: Signaling component. This vulnerability affects Firefox < 149 and     Firefox ESR < 140.9. (CVE-2026-4705)

    Incorrect boundary conditions in the Graphics: Canvas2D component. This vulnerability affects Firefox <     149, Firefox ESR < 115.34, and Firefox ESR < 140.9. (CVE-2026-4706)

    Incorrect boundary conditions in the Graphics: Canvas2D component. This vulnerability affects Firefox <     149, Firefox ESR < 115.34, and Firefox ESR < 140.9. (CVE-2026-4707)

    Incorrect boundary conditions in the Graphics component. This vulnerability affects Firefox < 149 and     Firefox ESR < 140.9. (CVE-2026-4708)

    Incorrect boundary conditions in the Audio/Video: GMP component. This vulnerability affects Firefox < 149,     Firefox ESR < 115.34, and Firefox ESR < 140.9. (CVE-2026-4709)

    Incorrect boundary conditions in the Audio/Video component. This vulnerability affects Firefox < 149 and     Firefox ESR < 140.9. (CVE-2026-4710)

    Use-after-free in the Widget: Cocoa component. This vulnerability affects Firefox < 149 and Firefox ESR <     140.9. (CVE-2026-4711)

    Information disclosure in the Widget: Cocoa component. This vulnerability affects Firefox < 149 and     Firefox ESR < 140.9. (CVE-2026-4712)

    Incorrect boundary conditions in the Graphics component. This vulnerability affects Firefox < 149 and     Firefox ESR < 140.9. (CVE-2026-4713)

    Incorrect boundary conditions in the Audio/Video component. This vulnerability affects Firefox < 149 and     Firefox ESR < 140.9. (CVE-2026-4714)

    Uninitialized memory in the Graphics: Canvas2D component. This vulnerability affects Firefox < 149 and     Firefox ESR < 140.9. (CVE-2026-4715)

    Incorrect boundary conditions, uninitialized memory in the JavaScript Engine component. This vulnerability     affects Firefox < 149 and Firefox ESR < 140.9. (CVE-2026-4716)

    Privilege escalation in the Netmonitor component. This vulnerability affects Firefox < 149 and Firefox ESR     < 140.9. (CVE-2026-4717)

    Undefined behavior in the WebRTC: Signaling component. This vulnerability affects Firefox < 149 and     Firefox ESR < 140.9. (CVE-2026-4718)

    Incorrect boundary conditions in the Graphics: Text component. This vulnerability affects Firefox < 149     and Firefox ESR < 140.9. (CVE-2026-4719)

    Memory safety bugs present in Firefox ESR 140.8, Thunderbird ESR 140.8, Firefox 148 and Thunderbird 148.
    Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of     these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 149 and     Firefox ESR < 140.9. (CVE-2026-4720)

    Memory safety bugs present in Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird ESR 140.8, Firefox 148     and Thunderbird 148. Some of these bugs showed evidence of memory corruption and we presume that with     enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects     Firefox < 149, Firefox ESR < 115.34, and Firefox ESR < 140.9. (CVE-2026-4721)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	名稱	產品	系列	已發布	已更新	嚴重性
303892	Debian dsa-6179 : thunderbird - security update	Nessus	Debian Local Security Checks	2026/3/26	2026/4/30	critical
303894	Debian dla-4510 : firefox-esr - security update	Nessus	Debian Local Security Checks	2026/3/26	2026/3/26	critical
306216	Amazon Linux 2023 : firefox (ALAS2023-2026-1554)	Nessus	Amazon Linux Local Security Checks	2026/4/13	2026/4/13	critical
306281	Amazon Linux 2 : thunderbird, --advisory ALAS2-2026-3241 (ALAS-2026-3241)	Nessus	Amazon Linux Local Security Checks	2026/4/14	2026/4/14	critical

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