SUSE-SU-2026:1379-1: important: Security update for MozillaThunderbird

[SLE-UPDATES]

# Security update for MozillaThunderbird

Announcement ID: SUSE-SU-2026:1379-1  
Release Date: 2026-04-16T08:42:00Z  
Rating: important  
References:

  * bsc#1261663

  
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 Desktop 15 SP7
  * SUSE Linux Enterprise Real Time 15 SP7
  * SUSE Linux Enterprise Server 15 SP7
  * SUSE Linux Enterprise Server for SAP Applications 15 SP7
  * SUSE Linux Enterprise Workstation Extension 15 SP7
  * SUSE Package Hub 15 15-SP7

  
  
An update that solves three vulnerabilities can now be installed.

## Description:

This update for MozillaThunderbird fixes the following issues:

  * Update to 149.0.2 and 140.9.1esr (bsc#1261663).
  * 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 Workstation Extension 15 SP7  
    zypper in -t patch SUSE-SLE-Product-WE-15-SP7-2026-1379=1

  * SUSE Package Hub 15 15-SP7  
    zypper in -t patch SUSE-SLE-Module-Packagehub-Subpackages-15-SP7-2026-1379=1

## Package List:

  * SUSE Linux Enterprise Workstation Extension 15 SP7 (x86_64)
    * MozillaThunderbird-translations-common-140.9.1-150200.8.266.1
    * MozillaThunderbird-translations-other-140.9.1-150200.8.266.1
    * MozillaThunderbird-debuginfo-140.9.1-150200.8.266.1
    * MozillaThunderbird-140.9.1-150200.8.266.1
    * MozillaThunderbird-debugsource-140.9.1-150200.8.266.1
  * SUSE Package Hub 15 15-SP7 (aarch64 ppc64le s390x)
    * MozillaThunderbird-translations-common-140.9.1-150200.8.266.1
    * MozillaThunderbird-translations-other-140.9.1-150200.8.266.1
    * MozillaThunderbird-debuginfo-140.9.1-150200.8.266.1
    * MozillaThunderbird-140.9.1-150200.8.266.1
    * MozillaThunderbird-debugsource-140.9.1-150200.8.266.1

## 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

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