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SUSE Mozilla Firefox Key Memory Safety Issues Fix Advisory 2026-21157-1

suse
Calendar Grey April 21, 2026
Dist Suse Esm H88
Update for MozillaFirefox resolves critical risks including memory safety issues and integer overflow. Install patches now.
An update that solves three vulnerabilities and contains one feature can now be installed.

Summary

## 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

Topics%20covered

Topics Covered

security advisory SuSE important integer overflow memory safety mozilla firefox

References

* bsc#1261663

* jsc#PED-15778

Cross-

* 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

Severity
important
Lowest
Low
Medium
High
Critical

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

Topics%20covered

Topics Covered

security advisory SuSE important integer overflow memory safety mozilla firefox

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