CVE-2026-92042 Mozilla Firefox - Race Condition

Mozilla Firefox < 156 and Firefox ESR < 153.3 contain a race condition in the DOM Content Processes component, letting attackers cause potential denial of service or unexpected behavior, exploit requires no special conditions.

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
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
15 September 2026
Updated
15 October 2026
Weakness
CWE-362

Vendor fix

Update to Firefox 156 and Firefox ESR 153.3 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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