CVE-2026-6747
HighCVSS 7.5Exploitation Probability (EPSS)
Low risk32th percentile - higher than 32% of all known CVEs
Summary
A use-after-free vulnerability was found in the WebRTC component of Firefox and Thunderbird. The flaw was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.
Risk Assessment
An attacker could exploit this vulnerability to achieve remote code execution or cause application crashes, compromising system confidentiality and availability.
Recommendation
Immediately update Firefox to version 150 or later, and Thunderbird to version 150 or 140.10. For ESR versions, apply the update to 140.10.
Other vulnerabilities in WebRTC
See all- CVE-2026-8094Critical
An unspecified vulnerability was found in the WebRTC component of Firefox and Thunderbird. The flaw was fixed in Firefox ESR 140.10.2 and Thunderbird 140.10.2.
- CVE-2026-2757Critical
A vulnerability in the WebRTC: Audio/Video component of Firefox and Thunderbird due to incorrect boundary conditions. The flaw is fixed in Firefox 148, Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.
- CVE-2026-6753High
Incorrect boundary conditions were found in the WebRTC component of Firefox and Thunderbird, potentially leading to unexpected behavior. The vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.
- CVE-2026-6752High
A vulnerability in the WebRTC component of Firefox and Thunderbird is caused by incorrect boundary conditions. The flaw was fixed in Firefox 150, Firefox ESR 115.35, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.
Original NVD description (English source)
Use-after-free in the WebRTC component. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.