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