There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - libexpat through 2.9.0 contains a denial of service vulnerability because billion laughs protection in
    accountingDiffTolerated() in xmlparse.c detects entity amplification too late. Attackers can supply a
    moderately sized XML document with a large DTD and nested entity expansions to consume tens of seconds of
    CPU per parse. (CVE-2026-115506)

There are packages installed that are affected by multiple vulnerabilities referenced in the following CVEs:

  - libexpat 2.7.2 through 2.9.0 contains a denial of service vulnerability because XML_ParserReset zeroes the
    direct byte count but never offsets tracked heap allocations. Attackers can submit a large XML document so
    later documents on the same reset parser fail with XML_ERROR_NO_MEMORY until it is recreated.
    (CVE-2026-113351)

  - libexpat through 2.9.0 contains a denial of service vulnerability because billion laughs protection in
    accountingDiffTolerated() in xmlparse.c detects entity amplification too late. Attackers can supply a
    moderately sized XML document with a large DTD and nested entity expansions to consume tens of seconds of
    CPU per parse. (CVE-2026-115506)

  - libexpat through 2.9.0 contains a NULL pointer dereference vulnerability in externalEntityInitProcessor2()
    in lib/xmlparse.c that mishandles the XML_TOK_NONE token from empty input. Attackers who control stream
    chunking can force an empty non-final first parse on an external entity subparser, causing a later parse
    to crash the application. (CVE-2026-117610)

  - libexpat through 2.9.0 contains a signed integer overflow vulnerability in storeAtts() in lib/xmlparse.c
    that allows attackers to trigger out-of-bounds writes via oversized attribute counts. Attackers can supply
    a multi-gigabyte document with a start tag carrying over 2^30 attributes to overflow attIndex and
    nPrefixes, crashing applications or corrupting heap memory. (CVE-2026-118370)

Linux/Unix 主機上安裝了一個或多個受到弱點影響的套件，且廠商未提供可用的修補程式。

  - libexpat through 包含 2.9.0 拒絕服務弱點，因為 accounting中的 billion laughs 保護 xmlparse.c 中的 DiffTolerated（） 偵測實體放大為時已晚。攻擊者可以提供具有大型 DTD 和巢狀實體擴充的中等大小的 XML 文件，以每次剖析消耗數十秒的 CPU。（CVE-2026-115506）

請注意，Nessus 的判定取決於廠商所報告的套件是否存在。

Linux/Unix 主机中安装的一个或多个程序包受到一个漏洞影响，而供应商没有提供补丁程序。

  - libexpat through 2.9.0 包含一个拒绝服务漏洞，因为 xmlparse.c 中 accountingDiffTolerated（） 的 billion laughs 保护检测到实体放大太晚。攻击者可提供具有大型 DTD 和嵌套实体扩展的中等大小的 XML 文档，导致每次解析消耗数十秒的 CPU。（CVE-2026-115506）

请注意，Nessus 依赖供应商报告的程序包是否存在进行判断。

Linux/Unix ホストには、ベンダーが提供するパッチが利用できない脆弱性の影響を受ける複数のパッケージがインストールされています。

  - 2.9.0 までのlibexpatには、accountingのbillion laughs保護のサービス拒否の脆弱性が含まれています。xmlparse.cのDiffTolerated()がエンティティ増幅の検出が遅すぎるためです。攻撃者が、大きなDTDとネスト化されたエンティティ展開を持つ中程度のサイズのXMLドキュメントを提供し、解析ごとに数十秒のCPUを消費する可能性があります。(CVE-2026-115506)

Nessus は、ベンダーから報告されたパッケージの存在に依存していることに注意してください。

The version of expat installed on the remote host is prior to 2.10.0. It is, therefore, affected by multiple vulnerabilities as referenced in the SSA:2026-306-01 advisory.

    New expat packages are available for Slackware 15.0 and -current to fix security issues.

Tenable has extracted the preceding description block directly from the expat 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 Fedora 43 host has a package installed that is affected by a vulnerability as referenced in the FEDORA-2026-a83294f5ab advisory.

    Update to 2.9.0, fixes CVE-2026-115506.

Tenable has extracted the preceding description block directly from the Fedora 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 Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - libexpat through 2.9.0 contains a denial of service vulnerability because billion laughs protection in     accountingDiffTolerated() in xmlparse.c detects entity amplification too late. Attackers can supply a     moderately sized XML document with a large DTD and nested entity expansions to consume tens of seconds of     CPU per parse. (CVE-2026-115506)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	名稱	產品	系列	已發布	已更新	嚴重性
477143	Echo: expat: security update to 2.10.0-1	Tenable Cloud Security	Echo Local Security Checks	2026/10/23	2026/11/9	high
478182	Alpine: libexpat, multiple expat packages: security update to 2.10.0-r0	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	2026/11/2	2026/11/2	high
477143	Echo: expat: security update to 2.10.0-1	Tenable Self-Hosted Container Security	Echo Local Security Checks	2026/10/23	2026/11/9	high
478182	Alpine: libexpat, multiple expat packages: security update to 2.10.0-r0	Tenable Cloud Security	Alpine Linux Local Security Checks	2026/11/2	2026/11/2	high
478205	Chainguard: libexpat1, multiple expat packages: security update to 2.10.0-r0	Tenable Self-Hosted Container Security	Chainguard Local Security Checks	2026/11/3	2026/11/3	high
478205	Chainguard: libexpat1, multiple expat packages: security update to 2.10.0-r0	Tenable Cloud Security	Chainguard Local Security Checks	2026/11/3	2026/11/3	high
371288	Linux Distros 未修補弱點：CVE-2026-115506	Nessus	Misc.	2026/10/23	2026/11/9	high
371288	Linux Distros 未修补的漏洞：CVE-2026-115506	Nessus	Misc.	2026/10/23	2026/11/9	high
371288	Linux Distros のパッチ未適用の脆弱性: CVE-2026-115506	Nessus	Misc.	2026/10/23	2026/11/9	high
375415	Slackware Linux 15.0 / current expat Multiple Vulnerabilities (SSA:2026-306-01)	Nessus	Slackware Local Security Checks	2026/11/3	2026/11/3	high
378076	Fedora 43 : mingw-expat (2026-a83294f5ab)	Nessus	Fedora Local Security Checks	2026/11/10	2026/11/10	high
371288	Linux Distros Unpatched Vulnerability : CVE-2026-115506	Nessus	Misc.	2026/10/23	2026/11/9	high

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