CVE-2026-2757 describes a critical vulnerability stemming from incorrect boundary conditions within the WebRTC: Audio/Video component of Mozilla Firefox and Thunderbird. Specifically, Firefox versions prior to 148 and 115.33 (ESR), and Thunderbird versions prior to 148 and 140.8 (ESR) are affected. This vulnerability carries a CVSS score of 9.8 (CRITICAL), indicating it can be exploited remotely without user interaction, leading to high impact on confidentiality, integrity, and availability. There is currently no evidence of active exploitation, no public exploit code (Metasploit, Nuclei, ExploitDB), and it is not listed on the CISA KEV catalog. While there are a few community mentions and limited media coverage, its EPSS score is very low, suggesting a low probability of exploitation in the wild.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
< 115.33.0CPE matchmatch criteria | cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:* | ||
< 148.0CPE matchmatch criteria | cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:* | ||
>= 128.0, < 140.8.0CPE matchmatch criteria | cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:* | ||
< 140.8.0CPE matchmatch criteria | cpe:2.3:a:mozilla:thunderbird:*:*:*:*:esr:*:*:* | ||
< 148.0CPE matchmatch criteria | cpe:2.3:a:mozilla:thunderbird:*:*:*:*:-:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.
The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.