CVE-2026-92059 Firefox - Denial of Service

Firefox before 156 and Firefox ESR before 153.3 contain a boundary condition vulnerability in the Editor component, letting attackers potentially cause unexpected behavior or crashes, exploit requires crafted input.

CVSS base score 9.3 /10
Critical
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.11% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Denial of Service
Impact
Denial Of Service
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Published
15 September 2026
Updated
15 October 2026
Weakness
CWE-119

Vendor fix

Update to Firefox 156 or 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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