Threats Tagged 'cve-2026-74987'

A security update for Mozilla Firefox Extended Support Release (ESR) 140.14.0 addresses multiple vulnerabilities including privilege escalations, use-after-free bugs, information disclosures, site isolation issues, mitigation bypasses, race conditions, integer overflows, and same-origin policy bypasses across various components such as Graphics, DOM, Networking, JavaScript, and Storage. These issues were fixed in Firefox ESR 140.14.0 and related versions.

This update for MozillaFirefox fixes the following issues: Update to Firefox Extended Support Release 140.14.0 ESR. - MFSA 2026-76 (bsc#1274867) * CVE-2026-74934: Site isolation issue in the Graphics: CanvasWebGL component * CVE-2026-74935: Privilege escalation in the DOM: Networking component * CVE-2026-74936: Use-after-free in the JavaScript: WebAssembly component * CVE-2026-74939: Privilege escalation in the DOM: Navigation component * CVE-2026-74940: Use-after-free in the Graphics: Text component * CVE-2026-74941: Privilege escalation in the Graphics: CanvasWebGL component * CVE-2026-74942: Privilege escalation in the Remote Settings Client component * CVE-2026-74943: Use-after-free in the Graphics: ImageLib component * CVE-2026-74944: Use-after-free in the DOM: Core & HTML component * CVE-2026-74945: Information disclosure in the Graphics: Text component * CVE-2026-74946: Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component * CVE-2026-74948: Information disclosure in the Graphics component * CVE-2026-74949: Privilege escalation due to use-after-free in the Graphics:Canvas2D component * CVE-2026-74953: Privilege escalation in the Networking: Cookies component * CVE-2026-74957: Mitigation bypass in the Safe Browsing component * CVE-2026-74959: Mitigation bypass in the Storage: Cache API component * CVE-2026-74960: Site isolation issue in the WebExtensions component * CVE-2026-74962: Site isolation issue in the Networking: Cookies component * CVE-2026-74963: Same-origin policy bypass in the Networking: Cookies component * CVE-2026-74964: Integer overflow in the Graphics component * CVE-2026-74965: Privilege escalation in the Shell Integration component * CVE-2026-74967: Same-origin policy bypass in the Audio/Video: Playback component * CVE-2026-74969: Use-after-free in the Layout: Text and Fonts component * CVE-2026-74971: Information disclosure in the DOM: UI Events & Focus Handling component * CVE-2026-74972: Information disclosure in the DOM: Push Subscriptions component * CVE-2026-74973: Race condition, use-after-free in the Graphics component * CVE-2026-74974: Same-origin policy bypass in the Graphics: ImageLib component * CVE-2026-74976: JIT miscompilation in the JavaScript Engine: JIT component * CVE-2026-74983: Mitigation bypass in the Data Loss Prevention component * CVE-2026-74987: Internally found bugs fixed in Firefox ESR 140.14, Firefox ESR 153.1 and Firefox 154 * CVE-2026-74990: Internally found bugs fixed in Firefox ESR 115.39, Firefox ESR 140.14, Firefox ESR 153.1 and Firefox 154

Internally found bugs present in Thunderbird ESR 140.13, Thunderbird ESR 153.0 and Thunderbird 153. Some of these bugs showed evidence of memory corruption or another security-relevant defect and we presume that with enough effort some of these could have been exploited. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.