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SUSE MozillaFirefox Important Fix Denial-of-Service Issue 2026-2582

SUSE MozillaFirefox Important Fix Denial-of-Service Issue 2026-2582

Linuxsecurity •LinuxSecurity Advisories • June 24, 2026

## This update for MozillaFirefox fixes the following issues: Update to Firefox 140.12.0 ESR (MFSA 2026-58, bsc#1268071): * CVE-2026-12289: Privilege escalation in the Graphics: WebRender component. * CVE-2026-12290: Memory safety bug fixed in Firefox ESR 140.12. * CVE-2026-12291: Use-after-free in the Networking: HTTP component. * CVE-2026-12292: Incorrect boundary conditions in the Web Audio component. * CVE-2026-12294: Sandbox escape in the DOM: Workers component. * CVE-2026-12295: Sandbox escape in the DOM: component. * CVE-2026-12296: Sandbox escape in the Security: Process Sandboxing component. * CVE-2026-12297: Sandbox escape due to incorrect boundary conditions in the Networking component. * CVE-2026-12298: Memory safety bug fixed in Firefox ESR 140.12.

## This update for MozillaFirefox fixes the following issues: Update to Firefox 140.12.0 ESR (MFSA 2026-58, bsc#1268071): * CVE-2026-12289: Privilege escalation in the Graphics: WebRender component. * CVE-2026-12290: Memory safety bug fixed in Firefox ESR 140.12. * CVE-2026-12291: Use-after-free in the Networking: HTTP component. * CVE-2026-12292: Incorrect boundary conditions in the Web Audio component. * CVE-2026-12294: Sandbox escape in the DOM: Workers component. * CVE-2026-12295: Sandbox escape in the DOM: component. * CVE-2026-12296: Sandbox escape in the Security: Process Sandboxing component. * CVE-2026-12297: Sandbox escape due to incorrect boundary conditions in the Networking component. * CVE-2026-12298: Memory safety bug fixed in Firefox ESR 140.12.

* CVE-2026-12289 ( NVD ): 8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

* CVE-2026-12290 ( SUSE ): 8.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

* CVE-2026-12290 ( NVD ): 8.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

Announcement ID: SUSE-SU-2026:2582-1 Release Date: 2026-06-23T13:27:08Z Rating: important

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