CVE-2026-100805 Firefox - Race Condition & Use-After-Free

Firefox contains a race condition and use-after-free vulnerability in the Audio/Video component, letting attackers cause memory corruption or remote code execution, exploit requires crafted input to trigger race condition.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.22% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Race Condition
Impact
Remote Code Execution, Denial Of Service
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Published
29 September 2026
Updated
15 October 2026
Weakness
CWE-362

Vendor fix

Update to Firefox 157 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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