The version of mozilla-firefox installed on the remote host is prior to 140.14.0esr. It is, therefore, affected by multiple vulnerabilities as referenced in the SSA:2026-231-01 advisory.

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

Tenable has extracted the preceding description block directly from the mozilla-firefox 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 openSUSE 16 host has packages installed that are affected by multiple vulnerabilities as referenced in the openSUSE-SU-2026:21594-1 advisory.

    Update to Firefox Extended Support Release 140.14.0 ESR.

    - MFSA 2026-76 (bsc#1274867)
      * CVE-2026-74934: Site isolation issue in the Graphics: CanvasWebGL component
      * CVE-2026-74935: Privilege escalation in the DOM: Networking component
      * CVE-2026-74936: Use-after-free in the JavaScript: WebAssembly component
      * CVE-2026-74939: Privilege escalation in the DOM: Navigation component
      * CVE-2026-74940: Use-after-free in the Graphics: Text component
      * CVE-2026-74941: Privilege escalation in the Graphics: CanvasWebGL component
      * CVE-2026-74942: Privilege escalation in the Remote Settings Client component
      * CVE-2026-74943: Use-after-free in the Graphics: ImageLib component
      * CVE-2026-74944: Use-after-free in the DOM: Core & HTML component
      * CVE-2026-74945: Information disclosure in the Graphics: Text component
      * CVE-2026-74946: Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL     component
      * CVE-2026-74948: Information disclosure in the Graphics component
      * CVE-2026-74949: Privilege escalation due to use-after-free in the Graphics:Canvas2D component
      * CVE-2026-74953: Privilege escalation in the Networking: Cookies component
      * CVE-2026-74957: Mitigation bypass in the Safe Browsing component
      * CVE-2026-74959: Mitigation bypass in the Storage: Cache API component
      * CVE-2026-74960: Site isolation issue in the WebExtensions component
      * CVE-2026-74962: Site isolation issue in the Networking: Cookies component
      * CVE-2026-74963: Same-origin policy bypass in the Networking: Cookies component
      * CVE-2026-74964: Integer overflow in the Graphics component
      * CVE-2026-74965: Privilege escalation in the Shell Integration component
      * CVE-2026-74967: Same-origin policy bypass in the Audio/Video: Playback component
      * CVE-2026-74969: Use-after-free in the Layout: Text and Fonts component
      * CVE-2026-74971: Information disclosure in the DOM: UI Events & Focus Handling component
      * CVE-2026-74972: Information disclosure in the DOM: Push Subscriptions component
      * CVE-2026-74973: Race condition, use-after-free in the Graphics component
      * CVE-2026-74974: Same-origin policy bypass in the Graphics: ImageLib component
      * CVE-2026-74976: JIT miscompilation in the JavaScript Engine: JIT component
      * CVE-2026-74983: Mitigation bypass in the Data Loss Prevention component
      * CVE-2026-74987: Internally found bugs fixed in Firefox ESR 140.14, Firefox ESR 153.1 and Firefox 154
      * CVE-2026-74990: Internally found bugs fixed in Firefox ESR 115.39, Firefox ESR 140.14, Firefox ESR     153.1 and         Firefox 154

Tenable has extracted the preceding description block directly from the SUSE 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 Redhat Enterprise Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:58897 advisory.

    Mozilla Firefox is an open-source web browser, designed for standards compliance, performance, and     portability.

    Security Fix(es):

    * firefox: thunderbird: Mitigation bypass in the Data Loss Prevention component (CVE-2026-74983)

    * firefox: thunderbird: Site isolation issue in the Graphics: CanvasWebGL component (CVE-2026-74934)

    * firefox: thunderbird: Privilege escalation in the Networking: Cookies component (CVE-2026-74953)

    * firefox: thunderbird: Internally found bugs fixed in Firefox ESR 140.14, Firefox ESR 153.1 and Firefox     154 (CVE-2026-74987)

    * firefox: thunderbird: Information disclosure in the Graphics component (CVE-2026-74948)

    * firefox: thunderbird: Use-after-free in the Graphics: ImageLib component (CVE-2026-74943)

    * firefox: thunderbird: Information disclosure in the DOM: UI Events & Focus Handling component     (CVE-2026-74971)

    * firefox: thunderbird: Privilege escalation in the Graphics: CanvasWebGL component (CVE-2026-74941)

    * firefox: Privilege escalation in the Shell Integration component (CVE-2026-74965)

    * firefox: thunderbird: Privilege escalation due to incorrect boundary conditions in the Graphics:
    CanvasWebGL component (CVE-2026-74946)

    * firefox: Race condition, use-after-free in the Graphics component (CVE-2026-74973)

    * firefox: thunderbird: Privilege escalation due to use-after-free in the Graphics: Canvas2D component     (CVE-2026-74949)

    * firefox: thunderbird: Internally found bugs fixed in Firefox ESR 115.39, Firefox ESR 140.14, Firefox ESR     153.1 and Firefox 154 (CVE-2026-74990)

    * firefox: thunderbird: Use-after-free in the JavaScript: WebAssembly component (CVE-2026-74936)

    * firefox: thunderbird: Use-after-free in the Graphics: Text component (CVE-2026-74940)

    * firefox: thunderbird: Site isolation issue in the WebExtensions component (CVE-2026-74960)

    * firefox: thunderbird: Use-after-free in the Layout: Text and Fonts component (CVE-2026-74969)

    * firefox: thunderbird: Mitigation bypass in the Storage: Cache API component (CVE-2026-74959)

    * firefox: thunderbird: JIT miscompilation in the JavaScript Engine: JIT component (CVE-2026-74976)

    * firefox: thunderbird: Same-origin policy bypass in the Graphics: ImageLib component (CVE-2026-74974)

    * firefox: thunderbird: Mitigation bypass in the Safe Browsing component (CVE-2026-74957)

    * firefox: thunderbird: Same-origin policy bypass in the Audio/Video: Playback component (CVE-2026-74967)

    * firefox: Privilege escalation in the Remote Settings Client component (CVE-2026-74942)

    * firefox: thunderbird: Privilege escalation in the DOM: Navigation component (CVE-2026-74939)

    * firefox: thunderbird: Information disclosure in the DOM: Push Subscriptions component (CVE-2026-74972)

    * firefox: thunderbird: Information disclosure in the Graphics: Text component (CVE-2026-74945)

    * firefox: thunderbird: Same-origin policy bypass in the Networking: Cookies component (CVE-2026-74963)

    * firefox: thunderbird: Use-after-free in the DOM: Core & HTML component (CVE-2026-74944)

    * firefox: Integer overflow in the Graphics component (CVE-2026-74964)

    * firefox: Site isolation issue in the Networking: Cookies component (CVE-2026-74962)

    * firefox: thunderbird: Privilege escalation in the DOM: Networking component (CVE-2026-74935)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise 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 Oracle Linux 8 host has a package installed that is affected by multiple vulnerabilities as referenced in the ELSA-2026-58898 advisory.

    [140.14.0-1.0.1]
    - Fix firefox-oracle-default-prefs.js for new nss [Orabug: 37079789]
    - diable wasi_sdk to prevent build failure with newer llvm

    [140.14.0]
    - Add debranding patches (Mustafa Gezen)
    - Add OpenELA default preferences (Louis Abel)

    [140.14.0-1]
    - Update to 140.14.0 ESR

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 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the RLSA-2026:58899 advisory.

    * firefox: thunderbird: Mitigation bypass in the Data Loss Prevention component (CVE-2026-74983)

    * firefox: thunderbird: Site isolation issue in the Graphics: CanvasWebGL component (CVE-2026-74934)

    * firefox: thunderbird: Privilege escalation in the Networking: Cookies component (CVE-2026-74953)

    * firefox: thunderbird: Internally found bugs fixed in Firefox ESR 140.14, Firefox ESR 153.1 and Firefox     154 (CVE-2026-74987)

    * firefox: thunderbird: Information disclosure in the Graphics component (CVE-2026-74948)

    * firefox: thunderbird: Use-after-free in the Graphics: ImageLib component (CVE-2026-74943)

    * firefox: thunderbird: Information disclosure in the DOM: UI Events & Focus Handling component     (CVE-2026-74971)

    * firefox: thunderbird: Privilege escalation in the Graphics: CanvasWebGL component (CVE-2026-74941)

    * firefox: Privilege escalation in the Shell Integration component (CVE-2026-74965)

    * firefox: thunderbird: Privilege escalation due to incorrect boundary conditions in the Graphics:
    CanvasWebGL component (CVE-2026-74946)

    * firefox: Race condition, use-after-free in the Graphics component (CVE-2026-74973)

    * firefox: thunderbird: Privilege escalation due to use-after-free in the Graphics: Canvas2D component     (CVE-2026-74949)

    * firefox: thunderbird: Internally found bugs fixed in Firefox ESR 115.39, Firefox ESR 140.14, Firefox ESR     153.1 and Firefox 154 (CVE-2026-74990)

    * firefox: thunderbird: Use-after-free in the JavaScript: WebAssembly component (CVE-2026-74936)

    * firefox: thunderbird: Use-after-free in the Graphics: Text component (CVE-2026-74940)

    * firefox: thunderbird: Site isolation issue in the WebExtensions component (CVE-2026-74960)

    * firefox: thunderbird: Use-after-free in the Layout: Text and Fonts component (CVE-2026-74969)

    * firefox: thunderbird: Mitigation bypass in the Storage: Cache API component (CVE-2026-74959)

    * firefox: thunderbird: JIT miscompilation in the JavaScript Engine: JIT component (CVE-2026-74976)

    * firefox: thunderbird: Same-origin policy bypass in the Graphics: ImageLib component (CVE-2026-74974)

    * firefox: thunderbird: Mitigation bypass in the Safe Browsing component (CVE-2026-74957)

    * firefox: thunderbird: Same-origin policy bypass in the Audio/Video: Playback component (CVE-2026-74967)

    * firefox: Privilege escalation in the Remote Settings Client component (CVE-2026-74942)

    * firefox: thunderbird: Privilege escalation in the DOM: Navigation component (CVE-2026-74939)

    * firefox: thunderbird: Information disclosure in the DOM: Push Subscriptions component (CVE-2026-74972)

    * firefox: thunderbird: Information disclosure in the Graphics: Text component (CVE-2026-74945)

    * firefox: thunderbird: Same-origin policy bypass in the Networking: Cookies component (CVE-2026-74963)

    * firefox: thunderbird: Use-after-free in the DOM: Core & HTML component (CVE-2026-74944)

    * firefox: Integer overflow in the Graphics component (CVE-2026-74964)

    * firefox: Site isolation issue in the Networking: Cookies component (CVE-2026-74962)

    * firefox: thunderbird: Privilege escalation in the DOM: Networking component (CVE-2026-74935)

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 AlmaLinux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the ALSA-2026:58897 advisory.

    * firefox: thunderbird: Mitigation bypass in the Data Loss Prevention component (CVE-2026-74983)
      * firefox: thunderbird: Site isolation issue in the Graphics: CanvasWebGL component (CVE-2026-74934)
      * firefox: thunderbird: Privilege escalation in the Networking: Cookies component (CVE-2026-74953)
      * firefox: thunderbird: Internally found bugs fixed in Firefox ESR 140.14, Firefox ESR 153.1 and Firefox     154 (CVE-2026-74987)
      * firefox: thunderbird: Information disclosure in the Graphics component (CVE-2026-74948)
      * firefox: thunderbird: Use-after-free in the Graphics: ImageLib component (CVE-2026-74943)
      * firefox: thunderbird: Information disclosure in the DOM: UI Events & Focus Handling component     (CVE-2026-74971)
      * firefox: thunderbird: Privilege escalation in the Graphics: CanvasWebGL component (CVE-2026-74941)
      * firefox: Privilege escalation in the Shell Integration component (CVE-2026-74965)
      * firefox: thunderbird: Privilege escalation due to incorrect boundary conditions in the Graphics:
    CanvasWebGL component (CVE-2026-74946)
      * firefox: Race condition, use-after-free in the Graphics component (CVE-2026-74973)
      * firefox: thunderbird: Privilege escalation due to use-after-free in the Graphics: Canvas2D component     (CVE-2026-74949)
      * firefox: thunderbird: Internally found bugs fixed in Firefox ESR 115.39, Firefox ESR 140.14, Firefox     ESR 153.1 and Firefox 154 (CVE-2026-74990)
      * firefox: thunderbird: Use-after-free in the JavaScript: WebAssembly component (CVE-2026-74936)
      * firefox: thunderbird: Use-after-free in the Graphics: Text component (CVE-2026-74940)
      * firefox: thunderbird: Site isolation issue in the WebExtensions component (CVE-2026-74960)
      * firefox: thunderbird: Use-after-free in the Layout: Text and Fonts component (CVE-2026-74969)
      * firefox: thunderbird: Mitigation bypass in the Storage: Cache API component (CVE-2026-74959)
      * firefox: thunderbird: JIT miscompilation in the JavaScript Engine: JIT component (CVE-2026-74976)
      * firefox: thunderbird: Same-origin policy bypass in the Graphics: ImageLib component (CVE-2026-74974)
      * firefox: thunderbird: Mitigation bypass in the Safe Browsing component (CVE-2026-74957)
      * firefox: thunderbird: Same-origin policy bypass in the Audio/Video: Playback component     (CVE-2026-74967)
      * firefox: Privilege escalation in the Remote Settings Client component (CVE-2026-74942)
      * firefox: thunderbird: Privilege escalation in the DOM: Navigation component (CVE-2026-74939)
      * firefox: thunderbird: Information disclosure in the DOM: Push Subscriptions component (CVE-2026-74972)
      * firefox: thunderbird: Information disclosure in the Graphics: Text component (CVE-2026-74945)
      * firefox: thunderbird: Same-origin policy bypass in the Networking: Cookies component (CVE-2026-74963)
      * firefox: thunderbird: Use-after-free in the DOM: Core & HTML component (CVE-2026-74944)
      * firefox: Integer overflow in the Graphics component (CVE-2026-74964)
      * firefox: Site isolation issue in the Networking: Cookies component (CVE-2026-74962)
      * firefox: thunderbird: Privilege escalation in the DOM: Networking component (CVE-2026-74935)

Tenable has extracted the preceding description block directly from the AlmaLinux 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 ALAS2023-2026-2105 advisory.

    Expat through 2.8.3 contains a denial of service vulnerability caused by quadratic algorithmic complexity     in the storeAtts() function in xmlparse.c, where processing N specified attributes with non-normalized     values triggers an O(N^2) linear scan of elementType->defaultAtts to determine CDATA status. A remote     unauthenticated attacker can supply a single well-formed XML document of a few megabytes to an application     parsing untrusted XML to cause excessive CPU consumption, resulting in denial of service without requiring     authentication, external entity resolution, or non-default parser options. (CVE-2026-66046)

    libexpat before 2.8.3 has an out-of-bounds read and resultant infinite loop because low surrogates are     treated the same as high surrogates during Unicode processing in the *_toUtf16 functions. (CVE-2026-72522)

    Site isolation issue in the Graphics: CanvasWebGL component. This vulnerability was fixed in Firefox 154,     Firefox ESR 115.39, Firefox ESR 140.14, and Firefox ESR 153.1. (CVE-2026-74934)

    Privilege escalation in the DOM: Networking component. This vulnerability was fixed in Firefox 154,     Firefox ESR 115.39, Firefox ESR 140.14, and Firefox ESR 153.1. (CVE-2026-74935)

    Use-after-free in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 154,     Firefox ESR 140.14, and Firefox ESR 153.1. (CVE-2026-74936)

    Mitigation bypass in the JavaScript: GC component. This vulnerability was fixed in Firefox 154, Firefox     ESR 153.1, Thunderbird 154, and Thunderbird 153.1. (CVE-2026-74938)

    Privilege escalation in the DOM: Navigation component. This vulnerability was fixed in Firefox 154,     Firefox ESR 115.39, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and     Thunderbird 153.1. (CVE-2026-74939)

    Use-after-free in the Graphics: Text component. This vulnerability was fixed in Firefox 154, Firefox ESR     115.39, Firefox ESR 140.14, and Firefox ESR 153.1. (CVE-2026-74940)

    Privilege escalation in the Graphics: CanvasWebGL component. This vulnerability was fixed in Firefox 154,     Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.
    (CVE-2026-74941)

    Privilege escalation in the Remote Settings Client component. This vulnerability was fixed in Firefox 154,     Firefox ESR 115.39, Firefox ESR 140.14, and Firefox ESR 153.1. (CVE-2026-74942)

    Use-after-free in the Graphics: ImageLib component. This vulnerability was fixed in Firefox 154, Firefox     ESR 115.39, Firefox ESR 140.14, and Firefox ESR 153.1. (CVE-2026-74943)

    Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 154, Firefox ESR     140.14, and Firefox ESR 153.1. (CVE-2026-74944)

    Information disclosure in the Graphics: Text component. This vulnerability was fixed in Firefox 154,     Firefox ESR 115.39, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and     Thunderbird 153.1. (CVE-2026-74945)

    Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component. This     vulnerability was fixed in Firefox 154, Firefox ESR 115.39, Firefox ESR 140.14, and Firefox ESR 153.1.
    (CVE-2026-74946)

    Information disclosure in the Graphics component. This vulnerability was fixed in Firefox 154, Firefox ESR     115.39, Firefox ESR 140.14, and Firefox ESR 153.1. (CVE-2026-74948)

    Privilege escalation due to use-after-free in the Graphics: Canvas2D component. This vulnerability was     fixed in Firefox 154, Firefox ESR 140.14, and Firefox ESR 153.1. (CVE-2026-74949)

    Privilege escalation in the Downloads API component. This vulnerability was fixed in Firefox 154, Firefox     ESR 153.1, Thunderbird 154, and Thunderbird 153.1. (CVE-2026-74950)

    Privilege escalation in the Networking: Cookies component. This vulnerability was fixed in Firefox 154,     Firefox ESR 140.14, and Firefox ESR 153.1. (CVE-2026-74953)

    Mitigation bypass in the Safe Browsing component. This vulnerability was fixed in Firefox 154, Firefox ESR     140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1. (CVE-2026-74957)

    Mitigation bypass in the Storage: Cache API component. This vulnerability was fixed in Firefox 154,     Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.
    (CVE-2026-74959)

    Site isolation issue in the WebExtensions component. This vulnerability was fixed in Firefox 154, Firefox     ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.
    (CVE-2026-74960)

    Site isolation issue in the Networking: Cookies component. This vulnerability was fixed in Firefox 154,     Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.
    (CVE-2026-74962)

    Same-origin policy bypass in the Networking: Cookies component. This vulnerability was fixed in Firefox     154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.
    (CVE-2026-74963)

    Integer overflow in the Graphics component. This vulnerability was fixed in Firefox 154, Firefox ESR     140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1. (CVE-2026-74964)

    Privilege escalation in the Shell Integration component. This vulnerability was fixed in Firefox 154,     Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.
    (CVE-2026-74965)

    Same-origin policy bypass in the Audio/Video: Playback component. This vulnerability was fixed in Firefox     154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.
    (CVE-2026-74967)

    Site isolation issue in the Graphics: WebRender component. This vulnerability was fixed in Firefox 154,     Firefox ESR 153.1, Thunderbird 154, and Thunderbird 153.1. (CVE-2026-74968)

    Use-after-free in the Layout: Text and Fonts component. This vulnerability was fixed in Firefox 154,     Firefox ESR 115.39, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and     Thunderbird 153.1. (CVE-2026-74969)

    Information disclosure in the DOM: UI Events & Focus Handling component. This vulnerability was fixed in     Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird     153.1. (CVE-2026-74971)

    Information disclosure in the DOM: Push Subscriptions component. This vulnerability was fixed in Firefox     154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.
    (CVE-2026-74972)

    Race condition, use-after-free in the Graphics component. This vulnerability was fixed in Firefox 154,     Firefox ESR 115.39, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and     Thunderbird 153.1. (CVE-2026-74973)

    Same-origin policy bypass in the Graphics: ImageLib component. This vulnerability was fixed in Firefox     154, Firefox ESR 115.39, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and     Thunderbird 153.1. (CVE-2026-74974)

    JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 154,     Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.
    (CVE-2026-74976)

    Mitigation bypass in the Data Loss Prevention component. This vulnerability was fixed in Firefox 154,     Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.
    (CVE-2026-74983)

    Internally found bugs present in Thunderbird ESR 140.13, Thunderbird ESR 153.0 and Thunderbird 153. Some     of these bugs showed evidence of memory corruption or another security-relevant defect and we presume that     with enough effort some of these could have been exploited. This vulnerability was fixed in Firefox 154,     Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.
    (CVE-2026-74987)

    Internally found bugs present in Thunderbird ESR 153.0 and Thunderbird 153. Some of these bugs showed     evidence of memory corruption or another security-relevant defect and we presume that with enough effort     some of these could have been exploited. This vulnerability was fixed in Firefox 154, Firefox ESR 153.1,     Thunderbird 154, and Thunderbird 153.1. (CVE-2026-74988)

    Internally found bugs present in Thunderbird ESR 140.13, Thunderbird ESR 153.0 and Thunderbird 153. Some     of these bugs showed evidence of memory corruption or another security-relevant defect and we presume that     with enough effort some of these could have been exploited. This vulnerability was fixed in Firefox 154,     Firefox ESR 115.39, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and     Thunderbird 153.1. (CVE-2026-74990)

    libexpat before 2.8.4 lacks handler call depth tracking with custom encoding callbacks. Thus, a use-after-     free can occur. NOTE: this is similar to CVE-2026-50219, CVE-2026-56131 and CVE-2026-56412.
    (CVE-2026-76957)

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 remote MiracleLinux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the AXSA:2026-1727:22 advisory.

    * firefox: thunderbird: Mitigation bypass in the Data Loss Prevention component (CVE-2026-74983)
      * firefox: thunderbird: Site isolation issue in the Graphics: CanvasWebGL component (CVE-2026-74934)
      * firefox: thunderbird: Privilege escalation in the Networking: Cookies component (CVE-2026-74953)
      * firefox: thunderbird: Internally found bugs fixed in Firefox ESR 140.14, Firefox ESR 153.1 and Firefox     154 (CVE-2026-74987)
      * firefox: thunderbird: Information disclosure in the Graphics component (CVE-2026-74948)
      * firefox: thunderbird: Use-after-free in the Graphics: ImageLib component (CVE-2026-74943)
      * firefox: thunderbird: Information disclosure in the DOM: UI Events & Focus Handling component     (CVE-2026-74971)
      * firefox: thunderbird: Privilege escalation in the Graphics: CanvasWebGL component (CVE-2026-74941)
      * firefox: Privilege escalation in the Shell Integration component (CVE-2026-74965)
      * firefox: thunderbird: Privilege escalation due to incorrect boundary conditions in the Graphics:
    CanvasWebGL component (CVE-2026-74946)
      * firefox: Race condition, use-after-free in the Graphics component (CVE-2026-74973)
      * firefox: thunderbird: Privilege escalation due to use-after-free in the Graphics: Canvas2D component     (CVE-2026-74949)
      * firefox: thunderbird: Internally found bugs fixed in Firefox ESR 115.39, Firefox ESR 140.14, Firefox     ESR 153.1 and Firefox 154 (CVE-2026-74990)
      * firefox: thunderbird: Use-after-free in the JavaScript: WebAssembly component (CVE-2026-74936)
      * firefox: thunderbird: Use-after-free in the Graphics: Text component (CVE-2026-74940)
      * firefox: thunderbird: Site isolation issue in the WebExtensions component (CVE-2026-74960)
      * firefox: thunderbird: Use-after-free in the Layout: Text and Fonts component (CVE-2026-74969)
      * firefox: thunderbird: Mitigation bypass in the Storage: Cache API component (CVE-2026-74959)
      * firefox: thunderbird: JIT miscompilation in the JavaScript Engine: JIT component (CVE-2026-74976)
      * firefox: thunderbird: Same-origin policy bypass in the Graphics: ImageLib component (CVE-2026-74974)
      * firefox: thunderbird: Mitigation bypass in the Safe Browsing component (CVE-2026-74957)
      * firefox: thunderbird: Same-origin policy bypass in the Audio/Video: Playback component     (CVE-2026-74967)
      * firefox: Privilege escalation in the Remote Settings Client component (CVE-2026-74942)
      * firefox: thunderbird: Privilege escalation in the DOM: Navigation component (CVE-2026-74939)
      * firefox: thunderbird: Information disclosure in the DOM: Push Subscriptions component (CVE-2026-74972)
      * firefox: thunderbird: Information disclosure in the Graphics: Text component (CVE-2026-74945)
      * firefox: thunderbird: Same-origin policy bypass in the Networking: Cookies component (CVE-2026-74963)
      * firefox: thunderbird: Use-after-free in the DOM: Core & HTML component (CVE-2026-74944)
      * firefox: Integer overflow in the Graphics component (CVE-2026-74964)
      * firefox: Site isolation issue in the Networking: Cookies component (CVE-2026-74962)
      * firefox: thunderbird: Privilege escalation in the DOM: Networking component (CVE-2026-74935)

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 remote Redhat Enterprise Linux 10 host has a package installed that is affected by multiple vulnerabilities as referenced in the RHSA-2026:64813 advisory.

    Mozilla Firefox is an open-source web browser, designed for standards compliance, performance, and     portability.

    Security Fix(es):

    * firefox: thunderbird: Mitigation bypass in the Data Loss Prevention component (CVE-2026-74983)

    * firefox: thunderbird: Site isolation issue in the Graphics: CanvasWebGL component (CVE-2026-74934)

    * firefox: thunderbird: Privilege escalation in the Networking: Cookies component (CVE-2026-74953)

    * firefox: thunderbird: Internally found bugs fixed in Firefox ESR 140.14, Firefox ESR 153.1 and Firefox     154 (CVE-2026-74987)

    * firefox: thunderbird: Information disclosure in the Graphics component (CVE-2026-74948)

    * firefox: thunderbird: Use-after-free in the Graphics: ImageLib component (CVE-2026-74943)

    * firefox: thunderbird: Information disclosure in the DOM: UI Events & Focus Handling component     (CVE-2026-74971)

    * firefox: thunderbird: Privilege escalation in the Graphics: CanvasWebGL component (CVE-2026-74941)

    * firefox: Privilege escalation in the Shell Integration component (CVE-2026-74965)

    * firefox: thunderbird: Privilege escalation due to incorrect boundary conditions in the Graphics:
    CanvasWebGL component (CVE-2026-74946)

    * firefox: Race condition, use-after-free in the Graphics component (CVE-2026-74973)

    * firefox: thunderbird: Privilege escalation due to use-after-free in the Graphics: Canvas2D component     (CVE-2026-74949)

    * firefox: thunderbird: Internally found bugs fixed in Firefox ESR 115.39, Firefox ESR 140.14, Firefox ESR     153.1 and Firefox 154 (CVE-2026-74990)

    * firefox: thunderbird: Use-after-free in the JavaScript: WebAssembly component (CVE-2026-74936)

    * firefox: thunderbird: Use-after-free in the Graphics: Text component (CVE-2026-74940)

    * firefox: thunderbird: Site isolation issue in the WebExtensions component (CVE-2026-74960)

    * firefox: thunderbird: Use-after-free in the Layout: Text and Fonts component (CVE-2026-74969)

    * firefox: thunderbird: Mitigation bypass in the Storage: Cache API component (CVE-2026-74959)

    * firefox: thunderbird: JIT miscompilation in the JavaScript Engine: JIT component (CVE-2026-74976)

    * firefox: thunderbird: Same-origin policy bypass in the Graphics: ImageLib component (CVE-2026-74974)

    * firefox: thunderbird: Mitigation bypass in the Safe Browsing component (CVE-2026-74957)

    * firefox: thunderbird: Same-origin policy bypass in the Audio/Video: Playback component (CVE-2026-74967)

    * firefox: Privilege escalation in the Remote Settings Client component (CVE-2026-74942)

    * firefox: thunderbird: Privilege escalation in the DOM: Navigation component (CVE-2026-74939)

    * firefox: thunderbird: Information disclosure in the DOM: Push Subscriptions component (CVE-2026-74972)

    * firefox: thunderbird: Information disclosure in the Graphics: Text component (CVE-2026-74945)

    * firefox: thunderbird: Same-origin policy bypass in the Networking: Cookies component (CVE-2026-74963)

    * firefox: thunderbird: Use-after-free in the DOM: Core & HTML component (CVE-2026-74944)

    * firefox: Integer overflow in the Graphics component (CVE-2026-74964)

    * firefox: Site isolation issue in the Networking: Cookies component (CVE-2026-74962)

    * firefox: thunderbird: Privilege escalation in the DOM: Networking component (CVE-2026-74935)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise 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 Redhat Enterprise Linux 8 host has a package installed that is affected by multiple vulnerabilities as referenced in the RHSA-2026:64814 advisory.

    Mozilla Firefox is an open-source web browser, designed for standards compliance, performance, and     portability.

    Security Fix(es):

    * firefox: thunderbird: Mitigation bypass in the Data Loss Prevention component (CVE-2026-74983)

    * firefox: thunderbird: Site isolation issue in the Graphics: CanvasWebGL component (CVE-2026-74934)

    * firefox: thunderbird: Privilege escalation in the Networking: Cookies component (CVE-2026-74953)

    * firefox: thunderbird: Internally found bugs fixed in Firefox ESR 140.14, Firefox ESR 153.1 and Firefox     154 (CVE-2026-74987)

    * firefox: thunderbird: Information disclosure in the Graphics component (CVE-2026-74948)

    * firefox: thunderbird: Use-after-free in the Graphics: ImageLib component (CVE-2026-74943)

    * firefox: thunderbird: Information disclosure in the DOM: UI Events & Focus Handling component     (CVE-2026-74971)

    * firefox: thunderbird: Privilege escalation in the Graphics: CanvasWebGL component (CVE-2026-74941)

    * firefox: Privilege escalation in the Shell Integration component (CVE-2026-74965)

    * firefox: thunderbird: Privilege escalation due to incorrect boundary conditions in the Graphics:
    CanvasWebGL component (CVE-2026-74946)

    * firefox: Race condition, use-after-free in the Graphics component (CVE-2026-74973)

    * firefox: thunderbird: Privilege escalation due to use-after-free in the Graphics: Canvas2D component     (CVE-2026-74949)

    * firefox: thunderbird: Internally found bugs fixed in Firefox ESR 115.39, Firefox ESR 140.14, Firefox ESR     153.1 and Firefox 154 (CVE-2026-74990)

    * firefox: thunderbird: Use-after-free in the JavaScript: WebAssembly component (CVE-2026-74936)

    * firefox: thunderbird: Use-after-free in the Graphics: Text component (CVE-2026-74940)

    * firefox: thunderbird: Site isolation issue in the WebExtensions component (CVE-2026-74960)

    * firefox: thunderbird: Use-after-free in the Layout: Text and Fonts component (CVE-2026-74969)

    * firefox: thunderbird: Mitigation bypass in the Storage: Cache API component (CVE-2026-74959)

    * firefox: thunderbird: JIT miscompilation in the JavaScript Engine: JIT component (CVE-2026-74976)

    * firefox: thunderbird: Same-origin policy bypass in the Graphics: ImageLib component (CVE-2026-74974)

    * firefox: thunderbird: Mitigation bypass in the Safe Browsing component (CVE-2026-74957)

    * firefox: thunderbird: Same-origin policy bypass in the Audio/Video: Playback component (CVE-2026-74967)

    * firefox: Privilege escalation in the Remote Settings Client component (CVE-2026-74942)

    * firefox: thunderbird: Privilege escalation in the DOM: Navigation component (CVE-2026-74939)

    * firefox: thunderbird: Information disclosure in the DOM: Push Subscriptions component (CVE-2026-74972)

    * firefox: thunderbird: Information disclosure in the Graphics: Text component (CVE-2026-74945)

    * firefox: thunderbird: Same-origin policy bypass in the Networking: Cookies component (CVE-2026-74963)

    * firefox: thunderbird: Use-after-free in the DOM: Core & HTML component (CVE-2026-74944)

    * firefox: Integer overflow in the Graphics component (CVE-2026-74964)

    * firefox: Site isolation issue in the Networking: Cookies component (CVE-2026-74962)

    * firefox: thunderbird: Privilege escalation in the DOM: Networking component (CVE-2026-74935)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise 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.

ID	Name	Product	Family	Published	Updated	Severity
338219	Slackware Linux 15.0 / current mozilla-firefox Multiple Vulnerabilities (SSA:2026-231-01)	Nessus	Slackware Local Security Checks	8/20/2026	8/24/2026	critical
338684	openSUSE 16: MozillaFirefox / MozillaFirefox-branding-upstream / etc (openSUSE-SU-2026:21594-1)	Nessus	SuSE Local Security Checks	8/21/2026	8/24/2026	critical
339160	RHEL 9 : firefox (RHSA-2026:58897)	Nessus	Red Hat Local Security Checks	8/24/2026	8/28/2026	critical
339360	Oracle Linux 8 : firefox (ELSA-2026-58898)	Nessus	Oracle Linux Local Security Checks	8/25/2026	8/25/2026	critical
339421	RockyLinux 10 : firefox (RLSA-2026:58899)	Nessus	Rocky Linux Local Security Checks	8/25/2026	8/28/2026	critical
340748	AlmaLinux 9 : firefox (ALSA-2026:58897)	Nessus	Alma Linux Local Security Checks	8/26/2026	8/28/2026	critical
341868	Amazon Linux 2023 : firefox (ALAS2023-2026-2105)	Nessus	Amazon Linux Local Security Checks	8/31/2026	9/3/2026	high
342263	MiracleLinux 9 : firefox-140.14.0-1.el9_8.ML.1 (AXSA:2026-1727:22)	Nessus	Miracle Linux Local Security Checks	9/1/2026	9/1/2026	critical
343805	RHEL 10 : firefox (RHSA-2026:64813)	Nessus	Red Hat Local Security Checks	9/8/2026	9/8/2026	critical
343817	RHEL 8 : firefox (RHSA-2026:64814)	Nessus	Red Hat Local Security Checks	9/8/2026	9/8/2026	critical

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