# Security update for MozillaFirefox
Announcement ID: SUSE-SU-2026:1273-1
Release Date: 2026-04-11T19:04:49Z
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
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
* SUSE Linux Enterprise Server for SAP Applications 12 SP5
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 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
* SUSE Linux Enterprise Server 12 SP5 LTSS Extended Security
zypper in -t patch SUSE-SLE-SERVER-12-SP5-LTSS-EXTENDED-SECURITY-2026-1273=1
## Package List:
* SUSE Linux Enterprise Server 12 SP5 LTSS (aarch64 ppc64le s390x x86_64)
* MozillaFirefox-140.9.1-112.307.1
* MozillaFirefox-debugsource-140.9.1-112.307.1
* MozillaFirefox-debuginfo-140.9.1-112.307.1
* MozillaFirefox-translations-common-140.9.1-112.307.1
* SUSE Linux Enterprise Server 12 SP5 LTSS (noarch)
* MozillaFirefox-devel-140.9.1-112.307.1
* SUSE Linux Enterprise Server 12 SP5 LTSS Extended Security (x86_64)
* MozillaFirefox-140.9.1-112.307.1
* MozillaFirefox-debugsource-140.9.1-112.307.1
* MozillaFirefox-debuginfo-140.9.1-112.307.1
* MozillaFirefox-translations-common-140.9.1-112.307.1
* SUSE Linux Enterprise Server 12 SP5 LTSS Extended Security (noarch)
* MozillaFirefox-devel-140.9.1-112.307.1
## 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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