SUSE-SU-2026:2039-1: important: Security update for MozillaFirefox

SLE-UPDATES null at suse.de
Thu May 21 20:32:31 UTC 2026 

# Security update for MozillaFirefox

Announcement ID: SUSE-SU-2026:2039-1  
Release Date: 2026-05-21T13:34:04Z  
Rating: important  
References:

  * bsc#1265212

  
Cross-References:

  * CVE-2026-8388
  * CVE-2026-8391
  * CVE-2026-8401
  * CVE-2026-8946
  * CVE-2026-8947
  * CVE-2026-8949
  * CVE-2026-8950
  * CVE-2026-8953
  * CVE-2026-8954
  * CVE-2026-8955
  * CVE-2026-8956
  * CVE-2026-8957
  * CVE-2026-8958
  * CVE-2026-8959
  * CVE-2026-8961
  * CVE-2026-8962
  * CVE-2026-8968
  * CVE-2026-8970
  * CVE-2026-8974
  * CVE-2026-8975

  
CVSS scores:

  * CVE-2026-8388 ( NVD ):  6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
  * CVE-2026-8391 ( NVD ):  5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
  * CVE-2026-8401 ( SUSE ):  8.3 CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H
  * CVE-2026-8401 ( NVD ):  9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
  * CVE-2026-8946 ( SUSE ):  8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
  * CVE-2026-8946 ( NVD ):  7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
  * CVE-2026-8947 ( SUSE ):  8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
  * CVE-2026-8947 ( NVD ):  7.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
  * CVE-2026-8949 ( SUSE ):  6.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L
  * CVE-2026-8949 ( NVD ):  7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
  * CVE-2026-8950 ( SUSE ):  6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
  * CVE-2026-8950 ( NVD ):  9.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N
  * CVE-2026-8953 ( SUSE ):  7.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L
  * CVE-2026-8953 ( NVD ):  9.6 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
  * CVE-2026-8954 ( SUSE ):  7.6 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:L
  * CVE-2026-8954 ( NVD ):  7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
  * CVE-2026-8955 ( SUSE ):  6.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L
  * CVE-2026-8955 ( NVD ):  8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
  * CVE-2026-8956 ( SUSE ):  6.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L
  * CVE-2026-8956 ( NVD ):  9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
  * CVE-2026-8957 ( SUSE ):  6.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L
  * CVE-2026-8957 ( NVD ):  8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
  * CVE-2026-8958 ( SUSE ):  8.6 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
  * CVE-2026-8958 ( NVD ):  8.6 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
  * CVE-2026-8959 ( SUSE ):  7.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L
  * CVE-2026-8959 ( NVD ):  9.6 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
  * CVE-2026-8961 ( SUSE ):  6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
  * CVE-2026-8961 ( NVD ):  6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
  * CVE-2026-8962 ( SUSE ):  5.4 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
  * CVE-2026-8962 ( NVD ):  8.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
  * CVE-2026-8968 ( SUSE ):  4.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
  * CVE-2026-8968 ( NVD ):  7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
  * CVE-2026-8970 ( SUSE ):  6.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L
  * CVE-2026-8970 ( NVD ):  8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
  * CVE-2026-8974 ( SUSE ):  8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
  * CVE-2026-8974 ( NVD ):  8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
  * CVE-2026-8975 ( SUSE ):  8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
  * CVE-2026-8975 ( NVD ):  8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

  
Affected Products:

  * SUSE Linux Enterprise High Performance Computing 12 SP5
  * SUSE Linux Enterprise Server 12 SP5
  * SUSE Linux Enterprise Server 12 SP5 LTSS
  * SUSE Linux Enterprise Server 12 SP5 LTSS Extended Security
  * SUSE Linux Enterprise Server for SAP Applications 12 SP5

  
  
An update that solves 20 vulnerabilities can now be installed.

## Description:

This update for MozillaFirefox fixes the following issue

Update to Firefox Extended Support Release 140.11.0 ESR MFSA 2026-48
(bsc#1265212)

  * CVE-2026-8388: Incorrect boundary conditions in the JavaScript Engine: JIT
    component.
  * CVE-2026-8391: Other issue in the JavaScript Engine component.
  * CVE-2026-8401: Sandbox escape in the Profile Backup component.
  * CVE-2026-8946: Incorrect boundary conditions in the Audio/Video: Web Codecs
    component.
  * CVE-2026-8947: Use-after-free in the DOM: Bindings (WebIDL) component.
  * CVE-2026-8949: Integer overflow in the Widget: Win32 component.
  * CVE-2026-8950: Same-origin policy bypass in the Networking: HTTP component.
  * CVE-2026-8953: Sandbox escape due to use-after-free in the Disability Access
    APIs component.
  * CVE-2026-8954: Incorrect boundary conditions, integer overflow in the
    Audio/Video component.
  * CVE-2026-8955: Privilege escalation in the DOM: Workers component.
  * CVE-2026-8956: Integer overflow in the Networking: JAR component.
  * CVE-2026-8957: Privilege escalation in the Enterprise Policies component.
  * CVE-2026-8958: Information disclosure, sandbox escape in the Security:
    Process Sandboxing component.
  * CVE-2026-8959: Sandbox escape due to incorrect boundary conditions in the
    Widget: Win32 component.
  * CVE-2026-8961: Spoofing issue in the Form Autofill component.
  * CVE-2026-8962: Mitigation bypass in the DOM: Security component.
  * CVE-2026-8968: Denial-of-service due to invalid pointer in the Audio/Video:
    Web Codecs component.
  * CVE-2026-8970: Privilege escalation in the Security component.
  * CVE-2026-8974: Memory safety bugs fixed in Firefox ESR 140.11 and Firefox
    151.
  * CVE-2026-8975: Memory safety bugs fixed in Firefox ESR 115.36, Firefox ESR
    140.11 and Firefox 151.

## Patch Instructions:

To install this SUSE update use the SUSE recommended installation methods like
YaST online_update or "zypper patch".  
Alternatively you can run the command listed for your product:

  * SUSE Linux Enterprise Server 12 SP5 LTSS  
    zypper in -t patch SUSE-SLE-SERVER-12-SP5-LTSS-2026-2039=1

  * SUSE Linux Enterprise Server 12 SP5 LTSS Extended Security  
    zypper in -t patch SUSE-SLE-SERVER-12-SP5-LTSS-EXTENDED-SECURITY-2026-2039=1

## Package List:

  * SUSE Linux Enterprise Server 12 SP5 LTSS (aarch64 ppc64le s390x x86_64)
    * MozillaFirefox-debuginfo-140.11.0-112.318.1
    * MozillaFirefox-translations-common-140.11.0-112.318.1
    * MozillaFirefox-debugsource-140.11.0-112.318.1
    * MozillaFirefox-140.11.0-112.318.1
  * SUSE Linux Enterprise Server 12 SP5 LTSS (noarch)
    * MozillaFirefox-devel-140.11.0-112.318.1
  * SUSE Linux Enterprise Server 12 SP5 LTSS Extended Security (x86_64)
    * MozillaFirefox-debuginfo-140.11.0-112.318.1
    * MozillaFirefox-translations-common-140.11.0-112.318.1
    * MozillaFirefox-debugsource-140.11.0-112.318.1
    * MozillaFirefox-140.11.0-112.318.1
  * SUSE Linux Enterprise Server 12 SP5 LTSS Extended Security (noarch)
    * MozillaFirefox-devel-140.11.0-112.318.1

## References:

  * https://www.suse.com/security/cve/CVE-2026-8388.html
  * https://www.suse.com/security/cve/CVE-2026-8391.html
  * https://www.suse.com/security/cve/CVE-2026-8401.html
  * https://www.suse.com/security/cve/CVE-2026-8946.html
  * https://www.suse.com/security/cve/CVE-2026-8947.html
  * https://www.suse.com/security/cve/CVE-2026-8949.html
  * https://www.suse.com/security/cve/CVE-2026-8950.html
  * https://www.suse.com/security/cve/CVE-2026-8953.html
  * https://www.suse.com/security/cve/CVE-2026-8954.html
  * https://www.suse.com/security/cve/CVE-2026-8955.html
  * https://www.suse.com/security/cve/CVE-2026-8956.html
  * https://www.suse.com/security/cve/CVE-2026-8957.html
  * https://www.suse.com/security/cve/CVE-2026-8958.html
  * https://www.suse.com/security/cve/CVE-2026-8959.html
  * https://www.suse.com/security/cve/CVE-2026-8961.html
  * https://www.suse.com/security/cve/CVE-2026-8962.html
  * https://www.suse.com/security/cve/CVE-2026-8968.html
  * https://www.suse.com/security/cve/CVE-2026-8970.html
  * https://www.suse.com/security/cve/CVE-2026-8974.html
  * https://www.suse.com/security/cve/CVE-2026-8975.html
  * https://bugzilla.suse.com/show_bug.cgi?id=1265212

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