The Rocky Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the CIQ crlsa-2026_98477 advisory.

    * dovecot: Dovecot: Denial of Service via IMAP ID command with excessive parameters (CVE-2026-42391)

    * dovecot: Dovecot: Authentication bypass via incorrect OAuth2 token validation (CVE-2026-73208)

    * dovecot: Dovecot: Denial of service via crafted email headers (CVE-2026-27852)

    * dovecot: Dovecot: Denial of Service via truncated quoted argument in ManageSieve (CVE-2026-40019)

    * dovecot: Dovecot: Denial of Service and potential message duplication via connection limit exhaustion     (CVE-2026-33263)

    * dovecot: Dovecot: Denial of Service in ManageSieve login process (CVE-2026-33605)

    * dovecot: Dovecot: Arbitrary Code Execution via Sieve editheader use-after-free (CVE-2026-42007)

    * dovecot: Dovecot: MySQL multi-byte escaping wrong (CVE-2026-40018)

Tenable has extracted the preceding description block directly from the CIQ 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 13 host has packages installed that are affected by multiple vulnerabilities as referenced in the dsa-6526 advisory.

    - -------------------------------------------------------------------------     Debian Security Advisory DSA-6526-1                   security@debian.org     https://www.debian.org/security/                       Moritz Muehlenhoff     September 28, 2026                    https://www.debian.org/security/faq
    - -------------------------------------------------------------------------

    Package        : dovecot     CVE ID         : CVE-2026-27852 CVE-2026-33263 CVE-2026-33604 CVE-2026-33605                      CVE-2026-33606 CVE-2026-33607 CVE-2026-40013 CVE-2026-40014                      CVE-2026-40015 CVE-2026-40017 CVE-2026-40018 CVE-2026-40203                      CVE-2026-40204 CVE-2026-40205 CVE-2026-42007 CVE-2026-42008                      CVE-2026-42391 CVE-2026-42392 CVE-2026-42393 CVE-2026-42394                      CVE-2026-42395 CVE-2026-52681 CVE-2026-52687 CVE-2026-73208                      CVE-2026-73209     Debian Bug     : 1144639

    Multiple vulnerabilities have been discovered in the Dovecot IMAP server     which could result in denial of service, SMTP smuggling, information     disclosure, code injection via malformed Sieve scripts or bypass of ACL     restrictions.

    For the stable distribution (trixie), these problems have been fixed in     version 1:2.4.1+dfsg1-6+deb13u7.

    We recommend that you upgrade your dovecot packages.

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

    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 RockyLinux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RLSA-2026:76763 advisory.

    * dovecot: Dovecot: Denial of Service via IMAP ID command with excessive parameters (CVE-2026-42391)

    * dovecot: Dovecot: Authentication bypass via incorrect OAuth2 token validation (CVE-2026-73208)

    * dovecot: Dovecot: Denial of service via crafted email headers (CVE-2026-27852)

    * dovecot: Dovecot: Denial of Service via truncated quoted argument in ManageSieve (CVE-2026-40019)

    * dovecot: Dovecot: Denial of Service and potential message duplication via connection limit exhaustion     (CVE-2026-33263)

    * dovecot: Dovecot: Denial of Service in ManageSieve login process (CVE-2026-33605)

    * dovecot: Dovecot: Arbitrary Code Execution via Sieve editheader use-after-free (CVE-2026-42007)

    * dovecot: Dovecot: MySQL multi-byte escaping wrong (CVE-2026-40018)

    Bug Fix(es) and Enhancement(s):

    * Dovecot crashes when accessing mailbox with: Panic: file mail-user.c: line 229 (mail_user_deinit):
    assertion failed: ((*user)->refcount == 1) (JIRA:Rocky Linux-176273)

Tenable has extracted the preceding description block directly from the RockyLinux 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 Oracle Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2026-76763 advisory.

    - fix CVE-2026-33605: ManageSieve login deadlock caused by lone CR       protocol violation (RHEL-251995)
    - fix CVE-2026-42007: heap use-after-free in pigeonhole edit_mail_snapshot       after deleteheader operation (RHEL-251946)
    - fix CVE-2026-40018: incorrect escaping of multi-byte strings in SQL commands (RHEL-252064)
    - fix CVE-2026-42391: pre-auth CPU/memory amplification via       excessive ID command key/value pairs (RHEL-252056)
    - fix CVE-2026-73208: OAuth2 scope check requires all configured scopes, add oauth2_audience setting     (RHEL-251905)
    - fix CVE-2026-27852: denial of service via memory exhaustion from       crafted message headers (RHEL-251573)
    - fix CVE-2026-33263: submission-login panic at       mail_max_userip_connections limit (RHEL-251922)

Tenable has extracted the preceding description block directly from the Oracle Linux 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 RockyLinux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RLSA-2026:80825 advisory.

    * dovecot: Dovecot: Denial of Service via IMAP ID command with excessive parameters (CVE-2026-42391)

    * dovecot: Dovecot: Authentication bypass via incorrect OAuth2 token validation (CVE-2026-73208)

    * dovecot: Dovecot: Denial of service via crafted email headers (CVE-2026-27852)

    * dovecot: Dovecot: Denial of Service via truncated quoted argument in ManageSieve (CVE-2026-40019)

    * dovecot: Dovecot: Denial of Service and potential message duplication via connection limit exhaustion     (CVE-2026-33263)

    * dovecot: Dovecot: Denial of Service in ManageSieve login process (CVE-2026-33605)

    * dovecot: Dovecot: Arbitrary Code Execution via Sieve editheader use-after-free (CVE-2026-42007)

    * dovecot: Dovecot: MySQL multi-byte escaping wrong (CVE-2026-40018)

Tenable has extracted the preceding description block directly from the RockyLinux 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 Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-130083 advisory.

    An attacker that holds a token intended for a different purpose can authenticate, because when an OAuth2     token response does not contain a scope claim, the audience claim is used in its place and checked against     the configured required scopes. These are different concepts, and the audience claim does not describe     what a token is allowed to do. A token that grants no relevant permissions can be accepted because its     intended recipient value happens to match a configured scope name, granting access that should have been     denied. It also hides an identity provider misconfiguration where scopes are not being issued at all.
    Ensure the identity provider issues a scope claim for all tokens used with Dovecot, and that configured     scope names do not match audience values. Update to non-vulnerable version. No publicly available exploits     are known.

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

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

The remote MiracleLinux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the AXSA:2026-2051:08 advisory.

    * dovecot: Dovecot: Denial of Service via IMAP ID command with excessive parameters (CVE-2026-42391)
      * dovecot: Dovecot: Authentication bypass via incorrect OAuth2 token validation (CVE-2026-73208)
      * dovecot: Dovecot: Denial of service via crafted email headers (CVE-2026-27852)
      * dovecot: Dovecot: Denial of Service via truncated quoted argument in ManageSieve (CVE-2026-40019)
      * dovecot: Dovecot: Denial of Service and potential message duplication via connection limit exhaustion     (CVE-2026-33263)
      * dovecot: Dovecot: Denial of Service in ManageSieve login process (CVE-2026-33605)
      * dovecot: Dovecot: Arbitrary Code Execution via Sieve editheader use-after-free (CVE-2026-42007)
      * dovecot: Dovecot: MySQL multi-byte escaping wrong (CVE-2026-40018)

Tenable has extracted the preceding description block directly from the MiracleLinux 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 CentOS Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the TuxCare CENTOS-STREAM8:CLSA-2026:1792237792 advisory.

  - An attacker that can send mail to a user can craft a message whose headers contain a very large number of     email addresses or MIME parameters, which causes excessive memory usage when the message is later parsed.
    The message is still delivered, but reading it over IMAP can exhaust the memory limit of the process and     terminate it, causing denial of service for the affected user. Update to non-vulnerable version. No     publicly available exploits are known. (CVE-2026-27852)

  - When mail_max_userip_connections is set (default 10) and reached, submission-login can crash with epoll()     panic caused by file descriptor handling issues. If running in high-security mode (default for community     releases), only the new submission connection gets terminated. If running in high-performance mode     (default for Pro releases), all connections handled by the submission-login process will be terminated.
    The crashes can cause failure for user to send a message, or it can cause duplicate messages to be sent.
    If TLS is not used (in the backend server processing the submission), duplicate deliveries cannot happen,     because the crash can only happen at AUTH stage. Limit the number of connections handled by single     submission-login process. This has a performance impact though. Update to non-vulnerable version. No     publicly available exploits are known. (CVE-2026-33263)

  - An unauthenticated attacker can crash the ManageSieve login process by sending a small malformed command     before authenticating. If running in high-security mode (default for community releases), only the     attacker's own connection is terminated. If running in high-performance mode (default for Pro releases),     all connections handled by the same managesieve-login process are terminated. Repeating the attack can     cause denial of service for Sieve script management. Restrict network access to the ManageSieve service to     trusted clients. Update to non-vulnerable version. No publicly available exploits are known.
    (CVE-2026-33605)

  - None None None No publicly available exploits are known. (CVE-2026-40018)

  - An attacker that has valid credentials can use a Sieve script with the editheader extension to trigger a     use-after-free in the mail editing code, and to write memory contents beyond the intended buffer into the     delivered mail. This causes memory leak and opportunity to do memory corruption during mail delivery,     which can crash the delivery process and may allow execution of arbitrary code in the context of that     process. Disable the Sieve editheader extension. Update to non-vulnerable version. No publicly available     exploits are known. (CVE-2026-42007)

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

The remote RockyLinux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RLSA-2026:98477 advisory.

    * dovecot: Dovecot: Denial of Service via IMAP ID command with excessive parameters (CVE-2026-42391)

    * dovecot: Dovecot: Authentication bypass via incorrect OAuth2 token validation (CVE-2026-73208)

    * dovecot: Dovecot: Denial of service via crafted email headers (CVE-2026-27852)

    * dovecot: Dovecot: Denial of Service via truncated quoted argument in ManageSieve (CVE-2026-40019)

    * dovecot: Dovecot: Denial of Service and potential message duplication via connection limit exhaustion     (CVE-2026-33263)

    * dovecot: Dovecot: Denial of Service in ManageSieve login process (CVE-2026-33605)

    * dovecot: Dovecot: Arbitrary Code Execution via Sieve editheader use-after-free (CVE-2026-42007)

    * dovecot: Dovecot: MySQL multi-byte escaping wrong (CVE-2026-40018)

Tenable has extracted the preceding description block directly from the RockyLinux 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
381151	Rocky Linux 9 [CIQ] Security Update: dovecot / dovecot-debuginfo / dovecot-debugsource / dovecot-devel / etc Multiple Vulnerabilities (crlsa-2026_98477)	Nessus	Rocky Linux Local Security Checks	2026/11/14	2026/11/14	critical
350920	Debian dsa-6526 : dovecot-auth-lua - security update	Nessus	Debian Local Security Checks	2026/9/29	2026/10/23	critical
363744	RockyLinux 8 : dovecot (RLSA-2026:76763)	Nessus	Rocky Linux Local Security Checks	2026/10/7	2026/10/7	critical
363755	Oracle Linux 8 : dovecot (ELSA-2026-76763)	Nessus	Oracle Linux Local Security Checks	2026/10/7	2026/10/7	critical
365535	RockyLinux 9 : dovecot (RLSA-2026:80825)	Nessus	Rocky Linux Local Security Checks	2026/10/14	2026/10/14	critical
365809	Unity Linux 20.1050a / 20.1060a / 20.1070a Security Update: dovecot (UTSA-2026-130083)	Nessus	Unity Linux Local Security Checks	2026/10/14	2026/10/14	high
366016	MiracleLinux 9 : dovecot-2.3.16-18.el9_8.8 (AXSA:2026-2051:08)	Nessus	Miracle Linux Local Security Checks	2026/10/15	2026/10/15	critical
366780	CentOS Linux 8 [TuxCare] Security Update: dovecot / dovecot-devel / dovecot-mysql / dovecot-pgsql / etc Multiple Vulnerabilities (CENTOS-STREAM8:CLSA-2026:1792237792)	Nessus	CentOS Local Security Checks	2026/10/17	2026/10/17	critical
380627	RockyLinux 9 : dovecot (RLSA-2026:98477)	Nessus	Rocky Linux Local Security Checks	2026/11/13	2026/11/13	critical

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