CVE-2026-2799 is a critical use-after-free vulnerability in the DOM: Core & HTML component, affecting Mozilla Firefox and Thunderbird versions prior to 148. This flaw carries a CVSS score of 9.8, indicating a critical severity due to its network-based attack vector, low attack complexity, and high potential for complete compromise of confidentiality, integrity, and availability. While there is no evidence of active exploitation, exploit code, or KEV listing, the vulnerability has garnered some community discussion, as evidenced by mentions on Bluesky and Mastodon.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
< 148.0CPE matchmatch criteria | cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:* | ||
< 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.