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RLSA-2026:58899

RLSA-2026:58899 · Important: firefox security update

This page contains facts from public vulnerability sources. Check the original advisory before updating.

This page shows selected source facts. See the linked advisories for the complete description and affected versions.

Mozilla Firefox is an open-source web browser, designed for standards compliance, performance, and portability. Security Fix(es): * firefox: thunderbird: Mitigation bypass in the Data Loss Prevention component (CVE-2026-74983) * firefox: thunderbird: Site isolation issue in the Graphics: CanvasWebGL component (CVE-2026-74934) * firefox: thunderbird: Privilege escalation in the Networking: Cookies component (CVE-2026-74953) * firefox: thunderbird: Internally found bugs fixed in Firefox ESR 140.14, Firefox ESR 153.1 and Firefox 154 (CVE-2026-74987) * firefox: thunderbird: Information disclosure in the Graphics component (CVE-2026-74948) * firefox: thunderbird: Use-after-free in the Graphics: ImageLib component (CVE-2026-74943) * firefox: thunderbird: Information disclosure in the DOM: UI Events & Focus Handling component (CVE-2026-74971) * firefox: thunderbird: Privilege escalation in the Graphics: CanvasWebGL component (CVE-2026-74941) * firefox: Privilege escalation in the Shell Integration component (CVE-2026-74965) * firefox: thunderbird: Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component (CVE-2026-74946) * firefox: Race condition, use-after-free in the Graphics component (CVE-2026-74973) * firefox: thunderbird: Privilege escalation due to use-after-free in the Graphics: Canvas2D component (CVE-2026-74949) * firefox: thunderbird: Internally found bugs fixed in Firefox ESR 115.39, Firefox ESR 140.14, Firefox ESR 153.1 and Firefox 154 (CVE-2026-74990) * firefox: thunderbird: Use-after-free in the JavaScript: WebAssembly component (CVE-2026-74936) * firefox: thunderbird: Use-after-free in the Graphics: Text component (CVE-2026-74940) * firefox: thunderbird: Site isolation issue in the WebExtensions component (CVE-2026-74960) * firefox: thunderbird: Use-after-free in the Layout: Text and Fonts component (CVE-2026-74969) * firefox: thunderbird: Mitigation bypass in the Storage: Cache API component (CVE-2026-74959) * firefox: thunderbird: JIT miscompilation in the JavaScript Engine: JIT component (CVE-2026-74976) * firefox: thunderbird: Same-origin policy bypass in the Graphics: ImageLib component (CVE-2026-74974) * firefox: thunderbird: Mitigation bypass in the Safe Browsing component (CVE-2026-74957) * firefox: thunderbird: Same-origin policy bypass in the Audio/Video: Playback component (CVE-2026-74967) * firefox: Privilege escalation in the Remote Settings Client component (CVE-2026-74942) * firefox: thunderbird: Privilege escalation in the DOM: Navigation component (CVE-2026-74939) * firefox: thunderbird: Information disclosure in the DOM: Push Subscriptions component (CVE-2026-74972) * firefox: thunderbird: Information disclosure in the Graphics: Text component (CVE-2026-74945) * firefox: thunderbird: Same-origin policy bypass in the Networking: Cookies component (CVE-2026-74963) * firefox: thunderbird: Use-after-free in the DOM: Core & HTML component (CVE-2026-74944) * firefox: Integer overflow in the Graphics component (CVE-2026-74964) * firefox: Site isolation issue in the Networking: Cookies component (CVE-2026-74962) * firefox: thunderbird: Privilege escalation in the DOM: Networking component (CVE-2026-74935) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

CVSS 7.5 · High · Fix available

Published
Updated

Stack: system

Affected products and versions

  • firefox Rocky Linux:10

    Affected ranges
    • ECOSYSTEM: < 0:140.14.0-1.el10_2

    Update to 0:140.14.0-1.el10_2

Original sources

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