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SUSE MozillaFirefox Important Vulnerability Patch 2026-2039-1

suse
Calendar Grey May 21, 2026
Dist Suse Esm H88
Critical updates for MozillaFirefox on SUSE addresses 20 issues including sandbox escapes and denial of service risks.
An update that solves 20 vulnerabilities can now be installed.

Summary

## This update for MozillaFirefox fixes the following issue Update to Firefox Extended Support Release 140.11.0 ESR MFSA 2026-48 (bsc#1265212) * CVE-2026-8388: Incorrect boundary conditions in the JavaScript Engine: JIT component. * CVE-2026-8391: Other issue in the JavaScript Engine component. * CVE-2026-8401: Sandbox escape in the Profile Backup component. * CVE-2026-8946: Incorrect boundary conditions in the Audio/Video: Web Codecs component. * CVE-2026-8947: Use-after-free in the DOM: Bindings (WebIDL) component. * CVE-2026-8949: Integer overflow in the Widget: Win32 component. * CVE-2026-8950: Same-origin policy bypass in the Networking: HTTP component. * CVE-2026-8953: Sandbox escape due to use-after-free in the Disability Access APIs component.

Topics%20covered

Topics Covered

security advisory denial of service SuSE important sandbox escape MozillaFirefox

References

* bsc#1265212

Cross-

* CVE-2026-8388

* CVE-2026-8391

* CVE-2026-8401

* CVE-2026-8946

* CVE-2026-8947

* CVE-2026-8949

* CVE-2026-8950

* CVE-2026-8953

* CVE-2026-8954

* CVE-2026-8955

* CVE-2026-8956

* CVE-2026-8957

* CVE-2026-8958

* CVE-2026-8959

* CVE-2026-8961

* CVE-2026-8962

* CVE-2026-8968

* CVE-2026-8970

* CVE-2026-8974

* CVE-2026-8975

CVSS scores:

* CVE-2026-8388 ( NVD ): 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

* CVE-2026-8391 ( NVD ): 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

* CVE-2026-8401 ( SUSE ): 8.3 CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H

* CVE-2026-8401 ( NVD ): 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

* CVE-2026-8946 ( SUSE ): 8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Severity
important
Lowest
Low
Medium
High
Critical

Announcement ID: SUSE-SU-2026:2039-1
Release Date: 2026-05-21T13:34:04Z
Rating: important

Topics%20covered

Topics Covered

security advisory denial of service SuSE important sandbox escape MozillaFirefox

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