CVE-2026-100805: Mozilla Firefox

High severity, CVSS 7.5. EPSS: 0.2% chance of exploitation in the next 30 days.

Race condition, use-after-free in the Audio/Video component. This vulnerability was fixed in Thunderbird 157 and Firefox 157.

Affected products

• Mozilla Firefox
• Mozilla Thunderbird

Published 2026-09-29. Last modified 2026-09-30.