CVE-2026-4695 describes an incorrect boundary conditions vulnerability within the Audio/Video: Web Codecs component, affecting Mozilla Firefox versions prior to 149, Firefox ESR prior to 140.9, and Thunderbird versions prior to 149 and 140.9. Rated 7.5 HIGH, this flaw can be exploited remotely over the network with low complexity and no user interaction, primarily leading to a high impact on availability (denial of service). There is currently no evidence of active exploitation, nor are public exploit modules available in common repositories like Metasploit or ExploitDB. Community discussion and media coverage are minimal, with only a few security update advisories from vendors like SUSE.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
< 140.9.0CPE matchmatch criteria | cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:* | ||
< 149.0CPE matchmatch criteria | cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.
The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.