The remote Fedora 42 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-a026a1b0c5 advisory.

    - Fix blurry popups on some fraction scales (mzbz#2019668)

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 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-2026:1163-1 advisory.

    Update to Mozilla Thunderbird 140.9 (MFSA 2026-24, bsc#1260083):

    - CVE-2026-3889: Spoofing issue in Thunderbird
    - CVE-2026-4371: Out of bounds read in IMAP parsing
    - 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.

The version of firefox installed on the remote host is prior to 140.9.0-1. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2FIREFOX-2026-056 advisory.

    LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable     Network Graphics) raster image files. In versions 1.2.1 through 1.6.55, `png_set_tRNS` and `png_set_PLTE`     each alias a heap-allocated buffer between `png_struct` and `png_info`, sharing a single allocation across     two structs with independent lifetimes. The `trans_alpha` aliasing has been present since at least libpng     1.0, and the `palette` aliasing since at least 1.2.1. Both affect all prior release lines `png_set_tRNS`     sets `png_ptr->trans_alpha = info_ptr->trans_alpha` (256-byte buffer) and `png_set_PLTE` sets     `info_ptr->palette = png_ptr->palette` (768-byte buffer). In both cases, calling `png_free_data` (with     `PNG_FREE_TRNS` or `PNG_FREE_PLTE`) frees the buffer through `info_ptr` while the corresponding `png_ptr`     pointer remains dangling. Subsequent row-transform functions dereference and, in some code paths, write to     the freed memory. A second call to `png_set_tRNS` or `png_set_PLTE` has the same effect, because both     functions call `png_free_data` internally before reallocating the `info_ptr` buffer. Version 1.6.56 fixes     the issue.

    NOTE: https://github.com/pnggroup/libpng/security/advisories/GHSA-m4pc-p4q3-4c7jNOTE:
    https://github.com/pnggroup/libpng/pull/824NOTE: Fixed by:
    https://github.com/pnggroup/libpng/commit/23019269764e35ed8458e517f1897bd3c54820eb (v1.6.56)NOTE: Fixed     by: https://github.com/pnggroup/libpng/commit/a3a21443ed12bfa1ef46fa0d4fb2b74a0fa34a25 (v1.6.56)NOTE:
    Fixed by: https://github.com/pnggroup/libpng/commit/7ea9eea884a2328cc7fdcb3c0c00246a50d90667     (v1.6.56)NOTE: Fixed by:
    https://github.com/pnggroup/libpng/commit/c1b0318b393c90679e6fa5bc1d329fd5d5012ec1 (v1.6.56)     (CVE-2026-33416)

    LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable     Network Graphics) raster image files. In versions 1.6.36 through 1.6.55, an out-of-bounds read and write     exists in libpng's ARM/AArch64 Neon-optimized palette expansion path. When expanding 8-bit paletted rows     to RGB or RGBA, the Neon loop processes a final partial chunk without verifying that enough input pixels     remain. Because the implementation works backward from the end of the row, the final iteration     dereferences pointers before the start of the row buffer (OOB read) and writes expanded pixel data to the     same underflowed positions (OOB write). This is reachable via normal decoding of attacker-controlled PNG     input if Neon is enabled. Version 1.6.56 fixes the issue.

    NOTE: https://github.com/pnggroup/libpng/security/advisories/GHSA-wjr5-c57x-95m2NOTE: Introduced with:
    https://github.com/pnggroup/libpng/commit/7734cda20cf1236aef60f3bbd2267c97bbb40869 (v1.6.36)NOTE: Fixed     by: https://github.com/pnggroup/libpng/commit/aba9f18eba870d14fb52c5ba5d73451349e339c3 (v1.6.56)     (CVE-2026-33636)

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

    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 and     Firefox ESR < 140.9. (CVE-2026-4720)

    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, and Firefox ESR < 140.9. (CVE-2026-4721)

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.

ID	Name	Product	Family	Published	Updated	Severity
304448	Fedora 42 : firefox (2026-a026a1b0c5)	Nessus	Fedora Local Security Checks	3/31/2026	4/30/2026	critical
304635	SUSE SLED15: MozillaThunderbird / MozillaThunderbird-translations-common / etc (SUSE-SU-2026:1163-1)	Nessus	SuSE Local Security Checks	4/2/2026	6/26/2026	critical
306262	Amazon Linux 2 : firefox, --advisory ALAS2FIREFOX-2026-056 (ALASFIREFOX-2026-056)	Nessus	Amazon Linux Local Security Checks	4/14/2026	4/14/2026	critical

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