In libexpat before 2.8.1, the computational complexity of attribute name collision checks allows a denial of service via moderately sized crafted XML input.

The version of IBM HTTP Server running on the remote host is affected by multiple vulnerabilities:

  - IBM HTTP Server is vulnerable to denial of service and a potential remote code execution due to improper     input validation. (CVE-2026-9170)

  - IBM HTTP Server is vulnerable to remote code execution and denial of service in configurations with TLS     mutual authentication (client authentication). (CVE-2026-8855)

  - IBM HTTP Server contains a buffer overflow vulnerability. A privileged user, authenticated to the     Administration Server, could exploit this vulnerability to execute remote code or cause a denial of     service. (CVE-2026-8834)

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 140.10.2-1. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2-2026-3315 advisory.

    In libexpat before 2.8.1, the computational complexity of attribute name collision checks allows a denial     of service via moderately sized crafted XML input. (CVE-2026-45186)

    Use-after-free in the DOM: Networking component. This vulnerability was fixed in Firefox 150.0.2, Firefox     ESR 140.10.2, and Firefox ESR 115.35.2. (CVE-2026-8090)

    Incorrect boundary conditions in the Audio/Video: Playback component. This vulnerability was fixed in     Firefox 150, Thunderbird 150, Firefox ESR 140.10.1, Thunderbird 140.10.1, and Firefox ESR 115.35.2.
    (CVE-2026-8091)

    Memory safety bugs present in Firefox ESR 115.35.1, Firefox ESR 140.10.1 and Firefox 150.0.1. 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 was fixed in Firefox 150.0.2, Firefox ESR     140.10.2, and Firefox ESR 115.35.2. (CVE-2026-8092)

    Other issue in the WebRTC component. This vulnerability was fixed in Firefox ESR 140.10.2. (CVE-2026-8094)

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 firefox installed on the remote host is prior to 140.10.2-1. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2FIREFOX-2026-060 advisory.

    In libexpat before 2.8.1, the computational complexity of attribute name collision checks allows a denial     of service via moderately sized crafted XML input. (CVE-2026-45186)

    Use-after-free in the DOM: Networking component. This vulnerability was fixed in Firefox 150.0.2, Firefox     ESR 140.10.2, and Firefox ESR 115.35.2. (CVE-2026-8090)

    Incorrect boundary conditions in the Audio/Video: Playback component. This vulnerability was fixed in     Firefox 150, Thunderbird 150, Firefox ESR 140.10.1, Thunderbird 140.10.1, and Firefox ESR 115.35.2.
    (CVE-2026-8091)

    Memory safety bugs present in Firefox ESR 115.35.1, Firefox ESR 140.10.1 and Firefox 150.0.1. 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 was fixed in Firefox 150.0.2, Firefox ESR     140.10.2, and Firefox ESR 115.35.2. (CVE-2026-8092)

    Other issue in the WebRTC component. This vulnerability was fixed in Firefox ESR 140.10.2. (CVE-2026-8094)

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.

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2026-1725 advisory.

    In libexpat before 2.8.1, the computational complexity of attribute name collision checks allows a denial     of service via moderately sized crafted XML input. (CVE-2026-45186)

    Use-after-free in the DOM: Networking component. This vulnerability was fixed in Firefox 150.0.2, Firefox     ESR 140.10.2, and Firefox ESR 115.35.2. (CVE-2026-8090)

    Incorrect boundary conditions in the Audio/Video: Playback component. This vulnerability was fixed in     Firefox 150, Thunderbird 150, Firefox ESR 140.10.1, Thunderbird 140.10.1, and Firefox ESR 115.35.2.
    (CVE-2026-8091)

    Memory safety bugs present in Firefox ESR 115.35.1, Firefox ESR 140.10.1 and Firefox 150.0.1. 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 was fixed in Firefox 150.0.2, Firefox ESR     140.10.2, and Firefox ESR 115.35.2. (CVE-2026-8092)

    Other issue in the WebRTC component. This vulnerability was fixed in Firefox ESR 140.10.2. (CVE-2026-8094)

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.

An update of the expat package has been released.

The version of expat installed on the remote host is prior to 2.7.5 / 2.8.1. It is, therefore, affected by a vulnerability as referenced in the SSA:2026-132-01 advisory.

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

Tenable has extracted the preceding description block directly from the expat 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 version of FreeBSD installed on the remote host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the bacc1417-4d82-11f1-87f3-18dbf25a98c6 advisory.

    Expat 2.8.1 was released yesterday. The key motivation for cutting a release and doing so now was:
    Fixing vulnerability CVE-2026-45186 that allows easy denial of service.
    See also https://github.com/libexpat/libexpat/pull/1216

Tenable has extracted the preceding description block directly from the FreeBSD 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.

  - In libexpat before 2.8.1, the computational complexity of attribute name collision checks allows a denial     of service via moderately sized crafted XML input. (CVE-2026-45186)

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

ID	Name	Product	Family	Severity
317395	IBM HTTP Server 8.5.0.0 < 8.5.5.30 / 9.0.0.0 < 9.0.5.29 Multiple Vulnerabilities (7274065)	Nessus	Web Servers	critical
316912	Amazon Linux 2 : thunderbird, --advisory ALAS2-2026-3315 (ALAS-2026-3315)	Nessus	Amazon Linux Local Security Checks	high
316908	Amazon Linux 2 : firefox, --advisory ALAS2FIREFOX-2026-060 (ALASFIREFOX-2026-060)	Nessus	Amazon Linux Local Security Checks	high
316905	Amazon Linux 2023 : firefox (ALAS2023-2026-1725)	Nessus	Amazon Linux Local Security Checks	high
315994	Photon OS 4.0: Expat PHSA-2026-4.0-1022	Nessus	PhotonOS Local Security Checks	high
314368	Slackware Linux 15.0 / current expat Vulnerability (SSA:2026-132-01)	Nessus	Slackware Local Security Checks	high
314367	FreeBSD : Vulnerability found in Expat (bacc1417-4d82-11f1-87f3-18dbf25a98c6)	Nessus	FreeBSD Local Security Checks	high
313709	Linux Distros Unpatched Vulnerability : CVE-2026-45186	Nessus	Misc.	high

Detections

Analytics

CVE-2026-45186

high

Tenable Plugins

critical

high

high

high

high

high

high

high