SUSE alert openSUSE-SU-2026:20789-1 (firefox)

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openSUSE-SU-2026:20789-1: important: Security update for MozillaFirefox
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Mon, 25 May 2026 17:51:40 +0200
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<20260525155140.A1235FCEF@maintenance.suse.de>
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Article
openSUSE security update: security update for mozillafirefox
-------------------------------------------------------------

Announcement ID: openSUSE-SU-2026:20789-1
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-2026-8401 ( SUSE ): 8.3 CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H
  * CVE-2026-8946 ( SUSE ): 8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
  * CVE-2026-8947 ( SUSE ): 8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
  * CVE-2026-8949 ( SUSE ): 6.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L
  * CVE-2026-8950 ( SUSE ): 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
  * CVE-2026-8953 ( SUSE ): 7.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L
  * CVE-2026-8954 ( SUSE ): 7.6 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:L
  * CVE-2026-8955 ( SUSE ): 6.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L
  * CVE-2026-8956 ( SUSE ): 6.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L
  * CVE-2026-8957 ( SUSE ): 6.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L
  * CVE-2026-8958 ( SUSE ): 8.6 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
  * CVE-2026-8959 ( SUSE ): 7.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L
  * CVE-2026-8961 ( SUSE ): 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
  * CVE-2026-8962 ( SUSE ): 5.4 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
  * CVE-2026-8968 ( SUSE ): 4.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
  * CVE-2026-8970 ( SUSE ): 6.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L
  * CVE-2026-8974 ( SUSE ): 8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
  * CVE-2026-8975 ( SUSE ): 8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected Products:

         openSUSE Leap 16.0

-------------------------------------------------------------

An update that solves 20 vulnerabilities and has one bug fix can now be installed.

Description:

This update for MozillaFirefox fixes the following issues

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

MFSA 2026-48:

- 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 openSUSE security update use the suse recommended installation methods
   like YaST online_update or "zypper patch".
   Alternatively you can run the command listed for your product:

- openSUSE Leap 16.0

   zypper in -t patch openSUSE-Leap-16.0-795=1

Package List:

- openSUSE Leap 16.0:

  MozillaFirefox-140.11.0-160000.1.1
  MozillaFirefox-branding-upstream-140.11.0-160000.1.1
  MozillaFirefox-devel-140.11.0-160000.1.1
  MozillaFirefox-translations-common-140.11.0-160000.1.1
  MozillaFirefox-translations-other-140.11.0-160000.1.1

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