Site isolation issue in the Graphics component. This vulnerability was fixed in Firefox 156 and Thunderbird 156.

The remote Fedora 43 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-a387125860 advisory.

    Update to latest upstream version.

    ----

    Update to latest stable upstream version.

Tenable has extracted the preceding description block directly from the Fedora 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 packages installed that are affected by multiple vulnerabilities as referenced in the FEDORA-2026-d7ba4af112 advisory.

    NSS Release Notes

    Update NSS to 3.129.0

    - Bug 2017322 - set CKA_NSS_SERVER_DISTRUST_AFTER for CN=Izenpe.com.
    - Bug 2025246 - fix unknown key error type in ssl_SetAuthKeyBits.
    - Bug 2029288 - avoid integer overflow in PK11_BlockData.
    - Bug 2056790 - Use PK11 digest contexts for explicit hashing in cryptohi.
    - Bug 2056793 - Add tests for concurrent channel info queries during session replacement.
    - Bug 2057185 - Document ./mach try and its Mercurial-only caveat in CLAUDE.md.
    - Bug 2060316 - remove support for pre-standard Kyber.
    - Bug 2065219 - Update Cryptofuzz version.
    - Bug 2065423 - Build NSPR out of tree, into the dist directory.
    - Bug 2065879 - re-vendor HACL* and simplify run_hacl.sh.
    - Bug 2066046 - Fix a race in STAN_GetNSSCertificate.
    - Bug 2066265 - Support for ML-KEM-512 in freebl and softoken.
    - Bug 2066266 - ML-KEM-1024 incorrectly allows an explicit encapsulation seed.
    - Bug 2066591 - Remove write-only blLib and libraryName statics from freebl's lowhash_vector.
    - Bug 2066900 - pin NSPR 4.40 in CI.
    - Bug 2066960 - fix UB in ecperf.c.
    - Bug 2067237 - MLKEM mechinfo needs keys sizes.
    - Bug 2067239 - Old coverity issues.
    - Bug 2067434 - avoid building libcrux twice in makefile builds.
    - Bug 2068010 - fix non-linux arm64 makefile builds.
    - Bug 2068191 - add --dry-run to mach try to print job list.
    - Bug 2068788 - emit static library names during static build.

    https://firefox-source-docs.mozilla.org/security/nss/releases/nss_3_129.html

    Firefox updated to latest upstream (156.0)

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

  - Site isolation issue in the Graphics component. This vulnerability was fixed in Firefox 156 and     Thunderbird 156. (CVE-2026-92034)

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

The version of Thunderbird installed on the remote Windows host is prior to 156.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2026-94 advisory.

  - Privilege escalation in the Enterprise Policies component. This vulnerability was fixed in Firefox 156,     Firefox ESR 153.3, and Thunderbird 156. (CVE-2026-92073)

  - A maliciously constructed mail header could lead to multiple fields being parsed as one, or potential     memory safety violations. (CVE-2026-92238)

  - A maliciously constructed IMAP line could cause an out-of-bounds buffer read. (CVE-2026-92239)

  - A malicious or compromised IMAP server can trigger an out-of-bounds read in the IMAP response parser by     sending an untagged ' ID' response, crashing Thunderbird. The affected parsing path is reachable before     authentication. (CVE-2026-92240)

  - Use-after-free in the Audio/Video: Web Codecs component. This vulnerability was fixed in Firefox 156,     Firefox ESR 140.16, Firefox ESR 153.3, Thunderbird 156, and Thunderbird 140.16. (CVE-2026-92005)

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 macOS or Mac OS X host is prior to 156.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2026-94 advisory.

  - Privilege escalation in the Enterprise Policies component. This vulnerability was fixed in Firefox 156,     Firefox ESR 153.3, and Thunderbird 156. (CVE-2026-92073)

  - A maliciously constructed mail header could lead to multiple fields being parsed as one, or potential     memory safety violations. (CVE-2026-92238)

  - A maliciously constructed IMAP line could cause an out-of-bounds buffer read. (CVE-2026-92239)

  - A malicious or compromised IMAP server can trigger an out-of-bounds read in the IMAP response parser by     sending an untagged ' ID' response, crashing Thunderbird. The affected parsing path is reachable before     authentication. (CVE-2026-92240)

  - Use-after-free in the Audio/Video: Web Codecs component. This vulnerability was fixed in Firefox 156,     Firefox ESR 140.16, Firefox ESR 153.3, Thunderbird 156, and Thunderbird 140.16. (CVE-2026-92005)

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 macOS or Mac OS X host is prior to 156.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2026-90 advisory.

  - Privilege escalation in the Memory component. This vulnerability was fixed in Firefox 156 and Firefox ESR     153.3. (CVE-2026-92054)

  - Privilege escalation in the WebExtensions component. This vulnerability was fixed in Firefox 156, Firefox     ESR 115.41, Firefox ESR 140.16, and Firefox ESR 153.3. (CVE-2026-92015)

  - Use-after-free in the Audio/Video: Web Codecs component. This vulnerability was fixed in Firefox 156,     Firefox ESR 140.16, and Firefox ESR 153.3. (CVE-2026-92005)

  - Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component. This     vulnerability was fixed in Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, and Firefox ESR 153.3.
    (CVE-2026-92006, CVE-2026-92007, CVE-2026-92008, CVE-2026-92009, CVE-2026-92010, CVE-2026-92011,     CVE-2026-92012, CVE-2026-92013)

  - Sandbox escape due to incorrect boundary conditions in the Graphics component. This vulnerability was     fixed in Firefox 156 and Firefox ESR 153.3. (CVE-2026-92035)

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 Windows host is prior to 156.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2026-90 advisory.

  - Privilege escalation in the Memory component. This vulnerability was fixed in Firefox 156 and Firefox ESR     153.3. (CVE-2026-92054)

  - Privilege escalation in the WebExtensions component. This vulnerability was fixed in Firefox 156, Firefox     ESR 115.41, Firefox ESR 140.16, and Firefox ESR 153.3. (CVE-2026-92015)

  - Use-after-free in the Audio/Video: Web Codecs component. This vulnerability was fixed in Firefox 156,     Firefox ESR 140.16, and Firefox ESR 153.3. (CVE-2026-92005)

  - Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component. This     vulnerability was fixed in Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, and Firefox ESR 153.3.
    (CVE-2026-92006, CVE-2026-92007, CVE-2026-92008, CVE-2026-92009, CVE-2026-92010, CVE-2026-92011,     CVE-2026-92012, CVE-2026-92013)

  - Sandbox escape due to incorrect boundary conditions in the Graphics component. This vulnerability was     fixed in Firefox 156 and Firefox ESR 153.3. (CVE-2026-92035)

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

ID	Name	Product	Family	Type	Severity
351285	Fedora 43 : thunderbird (2026-a387125860)	Nessus	Fedora Local Security Checks	Local	critical
348270	Fedora 43 : firefox / nss (2026-d7ba4af112)	Nessus	Fedora Local Security Checks	Local	critical
346371	Linux Distros Unpatched Vulnerability : CVE-2026-92034	Nessus	Misc.	Local	critical
346179	Mozilla Thunderbird < 156.0	Nessus	Windows	Local	critical
346176	Mozilla Thunderbird < 156.0	Nessus	MacOS X Local Security Checks	Local	critical
345903	Mozilla Firefox < 156.0	Nessus	MacOS X Local Security Checks	Local	critical
345901	Mozilla Firefox < 156.0	Nessus	Windows	Local	critical

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CVE-2026-92034

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