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SUSE MozillaFirefox Important Memory Safety Issues CVE-2026-5731 1273-1

suse
Calendar Grey April 13, 2026
Dist Suse Esm H88
Critical update for MozillaFirefox from SUSE resolves important memory safety issues and includes a new feature.
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 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 Server 12 SP5 LTSS zypper in -t patch SUSE-SLE-SERVER-12-SP5-LTSS-2026-1273=1

Topics%20covered

Topics Covered

security advisory SuSE important integer overflow memory safety MozillaFirefox

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

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

Severity
important
Lowest
Low
Medium
High
Critical

Announcement ID: SUSE-SU-2026:1273-1
Release Date: 2026-04-11T19:04:49Z
Rating: important

Topics%20covered

Topics Covered

security advisory SuSE important integer overflow memory safety MozillaFirefox

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