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ALSA-2026:0667 — Important: firefox security update

Affected: AlmaLinux:8: firefox

Mozilla Firefox is an open-source web browser, designed for standards compliance, performance, and portability.

Security Fix(es):

* firefox: Spoofing issue in the Downloads Panel component (CVE-2025-14327) * firefox: Use-after-free in the JavaScript: GC component (CVE-2026-0885) * firefox: thunderbird: Memory safety bugs fixed in Firefox ESR 140.7, Thunderbird ESR 140.7, Firefox 147 and Thunderbird 147 (CVE-2026-0891) * firefox: Sandbox escape due to incorrect boundary conditions in the Graphics: CanvasWebGL component (CVE-2026-0878) * firefox: Use-after-free in the IPC component (CVE-2026-0882) * firefox: Use-after-free in the JavaScript Engine component (CVE-2026-0884) * firefox: Information disclosure in the Networking component (CVE-2026-0883) * firefox: Mitigation bypass in the DOM: Security component (CVE-2026-0877) * firefox: Spoofing issue in the DOM: Copy & Paste and Drag & Drop component (CVE-2026-0890) * firefox: Clickjacking issue, information disclosure in the PDF Viewer component (CVE-2026-0887) * firefox: Sandbox escape due to incorrect boundary conditions in the Graphics component (CVE-2026-0879) * firefox: Sandbox escape due to integer overflow in the Graphics component (CVE-2026-0880) * firefox: Incorrect boundary conditions in the Graphics component (CVE-2026-0886)

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) liste…

bdu:2026-00525

certfr-2026-avi-0038 — De multiples vulnérabilités ont été découvertes dans les produits Mozilla. Certaines d'entre elles permettent à un atta…

certfr-2026-avi-0038

cnvd-2026-11806

EUVD-2026-337597

fkie_cve-2026-0891

Memory safety bugs present in Firefox ESR 140.6, Thunderbird ESR 140.6, Firefox 146 and Thunderbird 146. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 147, Firefox ESR 140.7, Thunderbird 147, and Thunderbird 140.7.

GHSA-w588-qjhp-fm98

OESA-2026-1085 — firefox security update

Affected: openEuler:24.03-LTS-SP1: firefox

Mozilla Firefox is an open-source web browser, designed for standards compliance, performance and portability. %if 0 %global moz_debug_prefix /lib/debug %global moz_debug_dir /lib/debug/ %global uname_m %(uname -m) %global symbols_file_name -.en-US.-%(uname.crashreporter-symbols.zip %global symbols_file_path /lib/debug//-.en-US.-%(uname.crashreporter-symbols.zip %global _find_debuginfo_opts -p /lib/debug//-.en-US.-%(uname.crashreporter-symbols.zip -o debugcrashreporter.list %global crashreporter_pkg_name mozilla-crashreporter--debuginfo Security Fix(es):

Use-after-free vulnerability in the WebRTC Signaling component of Firefox browser. This vulnerability affects Firefox versions prior to 146 and Firefox ESR versions prior to 140.6.(CVE-2025-14321)

Sandbox escape due to incorrect boundary conditions in the Graphics: CanvasWebGL component. This vulnerability affects Firefox < 146, Firefox ESR < 115.31, and Firefox ESR < 140.6.(CVE-2025-14322)

Privilege escalation in the DOM: Notifications component. This vulnerability affects Firefox < 146, Firefox ESR < 115.31, and Firefox ESR < 140.6.(CVE-2025-14323)

A JIT (Just-In-Time) miscompilation vulnerability exists in the JavaScript Engine component of Mozilla Firefox. This vulnerability affects Firefox < 146, Firefox ESR < 115.31, and Firefox ESR < 140.6. An attacker could potentially exploit this vulnerability to cause memory corruption or execute arbitrary code.(CVE-2025-14324)

JIT miscompilation…

openSUSE-SU-2026:10037-1 — firefox-esr-140.7.0-1.1 on GA media

firefox-esr-140.7.0-1.1 on GA media

RHSA-2026:1413 — Red Hat Security Advisory: thunderbird security update

firefox: Spoofing issue in the Downloads Panel component firefox: thunderbird: Mitigation bypass in the DOM: Security component firefox: thunderbird: Sandbox escape due to incorrect boundary conditions in the Graphics: CanvasWebGL component firefox: thunderbird: Sandbox escape due to incorrect boundary conditions in the Graphics component firefox: thunderbird: Sandbox escape due to integer overflow in the Graphics component firefox: thunderbird: Use-after-free in the IPC component firefox: thunderbird: Information disclosure in the Networking component firefox: thunderbird: Use-after-free in the JavaScript Engine component firefox: thunderbird: Use-after-free in the JavaScript: GC component firefox: thunderbird: Incorrect boundary conditions in the Graphics component firefox: thunderbird: Clickjacking issue, information disclosure in the PDF Viewer component firefox: thunderbird: Spoofing issue in the DOM: Copy & Paste and Drag & Drop component firefox: thunderbird: Memory safety bugs fixed in Firefox ESR 140.7, Thunderbird ESR 140.7, Firefox 147 and Thunderbird 147

SUSE-SU-2026:0122-1 — Security update for MozillaFirefox

Security update for MozillaFirefox

UBUNTU-CVE-2026-0891

Affected: Ubuntu:18.04:LTS: mozjs52, Ubuntu:18.04:LTS: mozjs38, Ubuntu:20.04:LTS: mozjs68, Ubuntu:20.04:LTS: mozjs52, Ubuntu:22.04:LTS: mozjs102, Ubuntu:22.04:LTS: mozjs78, Ubuntu:22.04:LTS: mozjs91, Ubuntu:22.04:LTS: thunderbird, Ubuntu:24.04:LTS: mozjs102, Ubuntu:24.04:LTS: mozjs115

WID-SEC-W-2026-0090 — Mozilla Firefox und Thunderbird: Mehrere Schwachstellen

Ein Angreifer kann mehrere Schwachstellen in Mozilla Firefox und Thunderbird ausnutzen, um einen Denial-of-Service-Zustand herbeizuführen, vertrauliche Informationen offenzulegen, Spoofing-Angriffe durchzuführen, Sicherheitsmaßnahmen zu umgehen, Speicherbeschädigungen zu verursachen, die möglicherweise zur Ausführung von beliebigem Code führen, oder andere nicht näher definierte Angriffe durchzuführen.