CVE-2026-100813 Firefox - Remote Code Execution

Firefox contains a memory corruption vulnerability caused by an invalid pointer in the JavaScript Engine JIT component, letting attackers potentially execute arbitrary code, exploit requires crafted input.

CVSS base score 8.8 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.23% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Remote Code Execution
Impact
Remote Code Execution
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Published
29 September 2026
Updated
15 October 2026
Weakness
CWE-763

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

← All CVEs