The version of Firefox installed on the remote macOS or Mac OS X host is prior to 149.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2026-20 advisory.

  - Sandbox escape due to use-after-free in the Graphics: Canvas2D component. This vulnerability affects     Firefox < 149 and Thunderbird < 149. (CVE-2026-4725)

  - Race condition, use-after-free in the Graphics: WebRender component. This vulnerability affects Firefox <     149, Firefox ESR < 115.34, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.
    (CVE-2026-4684)

  - Incorrect boundary conditions in the Graphics: Canvas2D component. This vulnerability affects Firefox <     149, Firefox ESR < 115.34, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.
    (CVE-2026-4685, CVE-2026-4686, CVE-2026-4706, CVE-2026-4707)

  - Sandbox escape due to incorrect boundary conditions in the Telemetry component. This vulnerability affects     Firefox < 149, Firefox ESR < 115.34, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.
    (CVE-2026-4687)

  - Sandbox escape due to use-after-free in the Disability Access APIs component. This vulnerability affects     Firefox < 149, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9. (CVE-2026-4688)

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 149.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2026-23 advisory.

  - Sandbox escape due to use-after-free in the Graphics: Canvas2D component. This vulnerability affects     Firefox < 149 and Thunderbird < 149. (CVE-2026-4725)

  - Spoofing issue in Thunderbird. This vulnerability affects Thunderbird < 149 and Thunderbird < 140.9.
    (CVE-2026-3889)

  - A malicious mail server could send malformed strings with negative lengths, causing the parser to read     memory outside the buffer. If a mail server or connection to a mail server were compromised, an attacker     could cause the parser to malfunction, potentially crashing Thunderbird or leaking sensitive data.
    (CVE-2026-4371)

  - Race condition, use-after-free in the Graphics: WebRender component. This vulnerability affects Firefox <     149, Firefox ESR < 115.34, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.
    (CVE-2026-4684)

  - Incorrect boundary conditions in the Graphics: Canvas2D component. This vulnerability affects Firefox <     149, Firefox ESR < 115.34, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.
    (CVE-2026-4685, CVE-2026-4686, CVE-2026-4706, CVE-2026-4707)

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 Tencent Linux installed on the remote TencentOS Server 3 host is prior to tested version. It is, therefore, affected by multiple vulnerabilities as referenced in the TSSA-2026:0397 advisory.

    Package updates are available for TencentOS Server 3 that fix the following vulnerabilities:

    CVE-2026-4684:
    Race condition, use-after-free in the Graphics: WebRender component. This vulnerability affects Firefox <     149, Firefox ESR < 115.34, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.

    CVE-2026-4685:
    Incorrect boundary conditions in the Graphics: Canvas2D component. This vulnerability affects Firefox <     149, Firefox ESR < 115.34, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.

    CVE-2026-4686:
    Incorrect boundary conditions in the Graphics: Canvas2D component. This vulnerability affects Firefox <     149, Firefox ESR < 115.34, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.

    CVE-2026-4687:
    Sandbox escape due to incorrect boundary conditions in the Telemetry component. This vulnerability affects     Firefox < 149, Firefox ESR < 115.34, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.

    CVE-2026-4688:
    Sandbox escape due to use-after-free in the Disability Access APIs component. This vulnerability affects     Firefox < 149, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.

    CVE-2026-4689:
    Sandbox escape due to incorrect boundary conditions, integer overflow in the XPCOM component. This     vulnerability affects Firefox < 149, Firefox ESR < 115.34, Firefox ESR < 140.9, Thunderbird < 149, and     Thunderbird < 140.9.

    CVE-2026-4690:
    Sandbox escape due to incorrect boundary conditions, integer overflow in the XPCOM component. This     vulnerability affects Firefox < 149, Firefox ESR < 115.34, Firefox ESR < 140.9, Thunderbird < 149, and     Thunderbird < 140.9.

    CVE-2026-4691:
    Use-after-free in the CSS Parsing and Computation component. This vulnerability affects Firefox < 149,     Firefox ESR < 115.34, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.

    CVE-2026-4692:
    Sandbox escape in the Responsive Design Mode component. This vulnerability affects Firefox < 149, Firefox     ESR < 115.34, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.

    CVE-2026-4693:
    Incorrect boundary conditions in the Audio/Video: Playback component. This vulnerability affects Firefox <     149, Firefox ESR < 115.34, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.

    CVE-2026-4694:
    Incorrect boundary conditions, integer overflow in the Graphics component. This vulnerability affects     Firefox < 149, Firefox ESR < 115.34, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.

    CVE-2026-4695:
    Incorrect boundary conditions in the Audio/Video: Web Codecs component. This vulnerability affects Firefox     < 149, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.

    CVE-2026-4696:
    Use-after-free in the Layout: Text and Fonts component. This vulnerability affects Firefox < 149, Firefox     ESR < 115.34, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.

    CVE-2026-4697:
    Incorrect boundary conditions in the Audio/Video: Web Codecs component. This vulnerability affects Firefox     < 149, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.

    CVE-2026-4698:
    JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability affects Firefox < 149,     Firefox ESR < 115.34, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.

    CVE-2026-4699:
    Incorrect boundary conditions in the Layout: Text and Fonts component. This vulnerability affects Firefox     < 149, Firefox ESR < 115.34, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.

    CVE-2026-4700:
    Mitigation bypass in the Networking: HTTP component. This vulnerability affects Firefox < 149, Firefox ESR     < 140.9, Thunderbird < 149, and Thunderbird < 140.9.

    CVE-2026-4701:
    Use-after-free in the JavaScript Engine component. This vulnerability affects Firefox < 149, Firefox ESR <     140.9, Thunderbird < 149, and Thunderbird < 140.9.

    CVE-2026-4702:
    JIT miscompilation in the JavaScript Engine component. This vulnerability affects Firefox < 149, Firefox     ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.

    CVE-2026-4704:
    Denial-of-service in the WebRTC: Signaling component. This vulnerability affects Firefox < 149, Firefox     ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.

    CVE-2026-4705:
    Undefined behavior in the WebRTC: Signaling component. This vulnerability affects Firefox < 149, Firefox     ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.

    CVE-2026-4706:
    Incorrect boundary conditions in the Graphics: Canvas2D component. This vulnerability affects Firefox <     149, Firefox ESR < 115.34, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.

    CVE-2026-4707:
    Incorrect boundary conditions in the Graphics: Canvas2D component. This vulnerability affects Firefox <     149, Firefox ESR < 115.34, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.

    CVE-2026-4708:
    Incorrect boundary conditions in the Graphics component. This vulnerability affects Firefox < 149, Firefox     ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.

    CVE-2026-4709:
    Incorrect boundary conditions in the Audio/Video: GMP component. This vulnerability affects Firefox < 149,     Firefox ESR < 115.34, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.

    CVE-2026-4710:
    Incorrect boundary conditions in the Audio/Video component. This vulnerability affects Firefox < 149,     Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.

    CVE-2026-4711:
    Use-after-free in the Widget: Cocoa component. This vulnerability affects Firefox < 149, Firefox ESR <     140.9, Thunderbird < 149, and Thunderbird < 140.9.

    CVE-2026-4712:
    Information disclosure in the Widget: Cocoa component. This vulnerability affects Firefox < 149, Firefox     ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.

    CVE-2026-4713:
    Incorrect boundary conditions in the Graphics component. This vulnerability affects Firefox < 149, Firefox     ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.

    CVE-2026-4714:
    Incorrect boundary conditions in the Audio/Video component. This vulnerability affects Firefox < 149,     Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.

    CVE-2026-4715:
    Uninitialized memory in the Graphics: Canvas2D component. This vulnerability affects Firefox < 149,     Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.

    CVE-2026-4716:
    Incorrect boundary conditions, uninitialized memory in the JavaScript Engine component. This vulnerability     affects Firefox < 149, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.

    CVE-2026-4717:
    Privilege escalation in the Netmonitor component. This vulnerability affects Firefox < 149, Firefox ESR <     140.9, Thunderbird < 149, and Thunderbird < 140.9.

    CVE-2026-4718:
    Undefined behavior in the WebRTC: Signaling component. This vulnerability affects Firefox < 149, Firefox     ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.

    CVE-2026-4719:
    Incorrect boundary conditions in the Graphics: Text component. This vulnerability affects Firefox < 149,     Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.

    CVE-2026-4720:
    Memory safety bugs present in Firefox ESR 140.8, Thunderbird ESR 140.8, Firefox 148 and Thunderbird 148.
    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 affects Firefox < 149, Firefox     ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.

    CVE-2026-4721:
    Memory safety bugs present in Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird ESR 140.8, Firefox 148     and Thunderbird 148. 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 affects     Firefox < 149, Firefox ESR < 115.34, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.

Tenable has extracted the preceding description block directly from the Tencent 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 Rocky Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the CIQ crlsa-2026_5930 advisory.

    * firefox: thunderbird: Use-after-free in the JavaScript Engine component (CVE-2026-4701)

    * firefox: thunderbird: Memory safety bugs fixed in Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird ESR     140.9, Firefox 149 and Thunderbird 149 (CVE-2026-4721)

    * firefox: thunderbird: Privilege escalation in the Netmonitor component (CVE-2026-4717)

    * firefox: thunderbird: Sandbox escape due to use-after-free in the Disability Access APIs component     (CVE-2026-4688)

    * firefox: thunderbird: Incorrect boundary conditions in the Graphics: Canvas2D component (CVE-2026-4706)

    * firefox: thunderbird: Incorrect boundary conditions in the Audio/Video: Web Codecs component     (CVE-2026-4695)

    * firefox: thunderbird: Sandbox escape due to incorrect boundary conditions, integer overflow in the XPCOM     component (CVE-2026-4689)

    * firefox: thunderbird: JIT miscompilation in the JavaScript Engine: JIT component (CVE-2026-4698)

    * firefox: thunderbird: Incorrect boundary conditions, uninitialized memory in the JavaScript Engine     component (CVE-2026-4716)

    * firefox: thunderbird: Race condition, use-after-free in the Graphics: WebRender component     (CVE-2026-4684)

    * firefox: thunderbird: Undefined behavior in the WebRTC: Signaling component (CVE-2026-4705)

    * firefox: thunderbird: Uninitialized memory in the Graphics: Canvas2D component (CVE-2026-4715)

    * firefox: thunderbird: Incorrect boundary conditions in the Graphics: Canvas2D component (CVE-2026-4685)

    * firefox: thunderbird: Incorrect boundary conditions in the Audio/Video component (CVE-2026-4714)

    * firefox: thunderbird: Incorrect boundary conditions in the Audio/Video: GMP component (CVE-2026-4709)

    * firefox: thunderbird: Incorrect boundary conditions in the Audio/Video component (CVE-2026-4710)

    * firefox: thunderbird: Information disclosure in the Widget: Cocoa component (CVE-2026-4712)

    * firefox: thunderbird: Incorrect boundary conditions in the Audio/Video: Web Codecs component     (CVE-2026-4697)

    * firefox: thunderbird: Incorrect boundary conditions in the Graphics component (CVE-2026-4713)

    * firefox: thunderbird: Sandbox escape due to incorrect boundary conditions, integer overflow in the XPCOM     component (CVE-2026-4690)

    * firefox: thunderbird: Use-after-free in the Widget: Cocoa component (CVE-2026-4711)

    * firefox: thunderbird: Incorrect boundary conditions in the Graphics: Canvas2D component (CVE-2026-4686)

    * firefox: thunderbird: Incorrect boundary conditions in the Graphics component (CVE-2026-4708)

    * firefox: thunderbird: Use-after-free in the CSS Parsing and Computation component (CVE-2026-4691)

    * firefox: thunderbird: Incorrect boundary conditions in the Layout: Text and Fonts component     (CVE-2026-4699)

    * firefox: thunderbird: Use-after-free in the Layout: Text and Fonts component (CVE-2026-4696)

    * firefox: thunderbird: Incorrect boundary conditions in the Audio/Video: Playback component     (CVE-2026-4693)

    * firefox: thunderbird: Undefined behavior in the WebRTC: Signaling component (CVE-2026-4718)

    * firefox: thunderbird: JIT miscompilation in the JavaScript Engine component (CVE-2026-4702)

    * firefox: thunderbird: Incorrect boundary conditions in the Graphics: Text component (CVE-2026-4719)

    * firefox: thunderbird: Incorrect boundary conditions, integer overflow in the Graphics component     (CVE-2026-4694)

    * firefox: thunderbird: Sandbox escape in the Responsive Design Mode component (CVE-2026-4692)

    * firefox: thunderbird: Memory safety bugs fixed in Firefox ESR 140.9, Thunderbird ESR 140.9, Firefox 149     and Thunderbird 149 (CVE-2026-4720)

    * firefox: thunderbird: Mitigation bypass in the Networking: HTTP component (CVE-2026-4700)

    * firefox: thunderbird: Incorrect boundary conditions in the Graphics: Canvas2D component (CVE-2026-4707)

    * firefox: thunderbird: Denial-of-service in the WebRTC: Signaling component (CVE-2026-4704)

    * firefox: thunderbird: Sandbox escape due to incorrect boundary conditions in the Telemetry component     (CVE-2026-4687)

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 Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-101173 advisory.

    Incorrect boundary conditions in the Audio/Video component. This vulnerability was fixed in Firefox 149,     Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.

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 AlmaLinux 9.2 host has a package installed that is affected by multiple vulnerabilities as referenced in the TuxCare ALMALINUX9.2:CLSA-2026:1785560172 advisory.

  - Certificate OCSP revocation status was not checked when verifying S/Mime signatures. Mail signed with a     revoked certificate would be displayed as having a valid signature. Thunderbird versions from 68 to     102.7.0 were affected by this bug. This vulnerability affects Thunderbird < 102.7.1. (CVE-2023-0430)

  - If a MIME email combines OpenPGP and OpenPGP MIME data in a certain way Thunderbird repeatedly attempts to     process and display the message, which could cause Thunderbird's user interface to lock up and no longer     respond to the user's actions. An attacker could send a crafted message with this structure to attempt a     DoS attack. This vulnerability affects Thunderbird < 102.8. (CVE-2023-0616)

  - Unexpected data returned from the Safe Browsing API could have led to memory corruption and a potentially     exploitable crash. This vulnerability affects Thunderbird < 102.10 and Firefox ESR < 102.10.
    (CVE-2023-1945)

  - Due to the Firefox GTK wrapper code's use of text/plain for drag data and GTK treating all text/plain     MIMEs containing file URLs as being dragged a website could arbitrarily read a file via a call to     `DataTransfer.setData`. This vulnerability affects Firefox < 109, Firefox ESR < 102.7, and Thunderbird <     102.7. (CVE-2023-23598)

  - When importing a SPKI RSA public key as ECDSA P-256, the key would be handled incorrectly causing the tab     to crash. This vulnerability affects Firefox < 110, Thunderbird < 102.8, and Firefox ESR < 102.8.
    (CVE-2023-25742)

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

The remote SUSE Linux SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 / openSUSE 15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:1126-1 advisory.

    Update to Firefox 140.9.0 ESR (MFSA 2026-22, bsc#1260083):

      - CVE-2026-4684: Race condition, use-after-free in the Graphics: WebRender component
      - CVE-2026-4685: Incorrect boundary conditions in the Graphics: Canvas2D component
      - CVE-2026-4686: Incorrect boundary conditions in the Graphics: Canvas2D component
      - CVE-2026-4687: Sandbox escape due to incorrect boundary conditions in the Telemetry component
      - CVE-2026-4688: Sandbox escape due to use-after-free in the Disability Access APIs component
      - CVE-2026-4689: Sandbox escape due to incorrect boundary conditions, integer overflow in the XPCOM     component
      - CVE-2026-4690: Sandbox escape due to incorrect boundary conditions, integer overflow in the XPCOM     component
      - CVE-2026-4691: Use-after-free in the CSS Parsing and Computation component
      - CVE-2026-4692: Sandbox escape in the Responsive Design Mode component
      - CVE-2026-4693: Incorrect boundary conditions in the Audio/Video: Playback component
      - CVE-2026-4694: Incorrect boundary conditions, integer overflow in the Graphics component
      - CVE-2026-4695: Incorrect boundary conditions in the Audio/Video: Web Codecs component
      - CVE-2026-4696: Use-after-free in the Layout: Text and Fonts component
      - CVE-2026-4697: Incorrect boundary conditions in the Audio/Video: Web Codecs component
      - CVE-2026-4698: JIT miscompilation in the JavaScript Engine: JIT component
      - CVE-2026-4699: Incorrect boundary conditions in the Layout: Text and Fonts component
      - CVE-2026-4700: Mitigation bypass in the Networking: HTTP component
      - CVE-2026-4701: Use-after-free in the JavaScript Engine component
      - CVE-2026-4702: JIT miscompilation in the JavaScript Engine component
      - CVE-2026-4704: Denial-of-service in the WebRTC: Signaling component
      - CVE-2026-4705: Undefined behavior in the WebRTC: Signaling component
      - CVE-2026-4706: Incorrect boundary conditions in the Graphics: Canvas2D component
      - CVE-2026-4707: Incorrect boundary conditions in the Graphics: Canvas2D component
      - CVE-2026-4708: Incorrect boundary conditions in the Graphics component
      - CVE-2026-4709: Incorrect boundary conditions in the Audio/Video: GMP component
      - CVE-2026-4710: Incorrect boundary conditions in the Audio/Video component
      - CVE-2026-4711: Use-after-free in the Widget: Cocoa component
      - CVE-2026-4712: Information disclosure in the Widget: Cocoa component
      - CVE-2026-4713: Incorrect boundary conditions in the Graphics component
      - CVE-2026-4714: Incorrect boundary conditions in the Audio/Video component
      - CVE-2026-4715: Uninitialized memory in the Graphics: Canvas2D component
      - CVE-2026-4716: Incorrect boundary conditions, uninitialized memory in the JavaScript Engine component
      - CVE-2026-4717: Privilege escalation in the Netmonitor component
      - CVE-2025-59375: Denial-of-service in the XML component
      - CVE-2026-4718: Undefined behavior in the WebRTC: Signaling component
      - CVE-2026-4719: Incorrect boundary conditions in the Graphics: Text component
      - CVE-2026-4720: Memory safety bugs fixed in Firefox ESR 140.9, Thunderbird ESR 140.9, Firefox 149 and         Thunderbird 149
      - CVE-2026-4721: Memory safety bugs fixed in Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird ESR     140.9,         Firefox 149 and Thunderbird 149

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.

ID	名称	产品	系列	发布时间	最近更新时间	严重程度
303471	Mozilla Firefox < 149.0	Nessus	MacOS X Local Security Checks	2026/3/24	2026/4/30	critical
303504	Mozilla Thunderbird < 149.0	Nessus	MacOS X Local Security Checks	2026/3/24	2026/4/30	critical
316673	TencentOS Server 3: firefox (TSSA-2026:0397)	Nessus	Tencent Local Security Checks	2026/5/26	2026/5/26	critical
355936	Rocky Linux 9 [CIQ] Security Update: firefox / firefox-debuginfo / firefox-debugsource / firefox-x11 Multiple Vulnerabilities (crlsa-2026_5930)	Nessus	Rocky Linux Local Security Checks	2026/10/1	2026/10/1	critical
336457	Unity Linux 20.1050a / 20.1060a / 20.1070a Security Update: firefox (UTSA-2026-101173)	Nessus	Unity Linux Local Security Checks	2026/8/17	2026/8/17	critical
360088	AlmaLinux 9.2 [TuxCare] Security Update: thunderbird Multiple Vulnerabilities (ALMALINUX9.2:CLSA-2026:1785560172)	Nessus	Alma Linux Local Security Checks	2026/10/1	2026/10/1	critical
350280	SUSE SLED15: MozillaFirefox / MozillaFirefox-branding-upstream / etc (SUSE-SU-2026:1126-1)	Nessus	SuSE Local Security Checks	2026/9/25	2026/9/28	critical

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