CVE-2026-2797 is a critical use-after-free vulnerability in the JavaScript Garbage Collection (GC) component, affecting Mozilla Firefox and Thunderbird versions prior to 148. This flaw allows for remote code execution with high impact on confidentiality, integrity, and availability, as indicated by its CVSS score of 9.8. The attack requires no user interaction and has low attack complexity. While there is no evidence of active exploitation, public exploit code, or KEV listing, the vulnerability has garnered some community discussion, with 5 mentions across platforms like 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.