SUSE-SU-2026:21157-1: important: Security update for MozillaFirefox

[SLE-SECURITY-UPDATES]

# Security update for MozillaFirefox

Announcement ID: SUSE-SU-2026:21157-1  
Release Date: 2026-04-09T12:58:07Z  
Rating: important  
References:

  * bsc#1261663
  * jsc#PED-15778

  
Cross-References:

  * CVE-2026-5731
  * CVE-2026-5732
  * CVE-2026-5734

  
CVSS scores:

  * CVE-2026-5731 ( SUSE ):  7.5 CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
  * CVE-2026-5731 ( NVD ):  9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
  * CVE-2026-5732 ( SUSE ):  8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
  * CVE-2026-5732 ( NVD ):  8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
  * CVE-2026-5734 ( SUSE ):  7.5 CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
  * CVE-2026-5734 ( NVD ):  9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
  * CVE-2026-5734 ( NVD ):  8.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

  
Affected Products:

  * SUSE Linux Enterprise Server 16.0
  * SUSE Linux Enterprise Server for SAP applications 16.0

  
  
An update that solves three vulnerabilities and contains one feature can now be
installed.

## Description:

This update for MozillaFirefox fixes the following issues:

Update to Firefox Extended Support Release 140.9.1 ESR (bsc#1261663).

  * MFSA 2026-27:
  * CVE-2026-5731: memory safety bugs fixed in Firefox ESR 115.34.1, Firefox ESR
    140.9.1, Thunderbird ESR 140.9.1, Firefox 149.0.2 and Thunderbird 149.0.2.
  * CVE-2026-5732: incorrect boundary conditions, integer overflow in the
    Graphics: Text component.
  * CVE-2026-5734: memory safety bugs fixed in Firefox ESR 140.9.1, Thunderbird
    ESR 140.9.1, Firefox 149.0.2 and Thunderbird 149.0.2.

## 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 16.0  
    zypper in -t patch SUSE-SLES-16.0-501=1

  * SUSE Linux Enterprise Server for SAP applications 16.0  
    zypper in -t patch SUSE-SLES-16.0-501=1

## Package List:

  * SUSE Linux Enterprise Server 16.0 (aarch64 ppc64le s390x x86_64)
    * MozillaFirefox-translations-common-140.9.1-160000.1.1
    * MozillaFirefox-translations-other-140.9.1-160000.1.1
    * MozillaFirefox-debuginfo-140.9.1-160000.1.1
    * MozillaFirefox-140.9.1-160000.1.1
    * MozillaFirefox-debugsource-140.9.1-160000.1.1
  * SUSE Linux Enterprise Server 16.0 (noarch)
    * MozillaFirefox-devel-140.9.1-160000.1.1
  * SUSE Linux Enterprise Server for SAP applications 16.0 (ppc64le x86_64)
    * MozillaFirefox-translations-common-140.9.1-160000.1.1
    * MozillaFirefox-translations-other-140.9.1-160000.1.1
    * MozillaFirefox-debuginfo-140.9.1-160000.1.1
    * MozillaFirefox-140.9.1-160000.1.1
    * MozillaFirefox-debugsource-140.9.1-160000.1.1
  * SUSE Linux Enterprise Server for SAP applications 16.0 (noarch)
    * MozillaFirefox-devel-140.9.1-160000.1.1

## References:

  * https://www.suse.com/security/cve/CVE-2026-5731.html
  * https://www.suse.com/security/cve/CVE-2026-5732.html
  * https://www.suse.com/security/cve/CVE-2026-5734.html
  * https://bugzilla.suse.com/show_bug.cgi?id=1261663
  * https://jira.suse.com/browse/PED-15778

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