Firefox CVE Vulnerabilities

By Mozilla81 known vulnerabilities

Critical
11
High
48
Medium
22
Low
0
None
0

All Firefox CVEs

CVE-2026-6751
7.3 high

Uninitialized memory in the Audio/Video: Web Codecs component. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.

Apr 21, 2026
CVE-2026-6750
9.8 critical

Privilege escalation in the Graphics: WebRender component. This vulnerability was fixed in Firefox 150, Firefox ESR 115.35, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.

Apr 21, 2026
CVE-2026-6749
7.5 high

Information disclosure due to uninitialized memory in the Graphics: Canvas2D component. This vulnerability was fixed in Firefox 150, Firefox ESR 115.35, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.

Apr 21, 2026
CVE-2026-6748
9.8 critical

Uninitialized memory in the Audio/Video: Web Codecs component. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.

Apr 21, 2026
CVE-2026-6747
7.5 high

Use-after-free in the WebRTC component. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.

Apr 21, 2026
CVE-2026-6746
7.5 high

Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 150, Firefox ESR 115.35, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.

Apr 21, 2026
CVE-2025-14861
8.8 high

Memory safety bugs present in Firefox 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 146.0.1.

Dec 18, 2025
CVE-2025-14860
9.8 critical

Use-after-free in the Disability Access APIs component. This vulnerability was fixed in Firefox 146.0.1.

Dec 18, 2025
CVE-2025-14744
6.5 medium

Unicode RTLO characters could allow malicious websites to spoof filenames in the downloads UI for Firefox for iOS, potentially tricking users into saving files of an unexpected file type. This vulnerability was fixed in Firefox for iOS 144.0.

Dec 18, 2025