CVE-2026-100788 Firefox - Memory Corruption

Firefox contains a memory corruption vulnerability caused by invalid pointer usage in the JavaScript WebAssembly component, letting attackers potentially cause crashes or execute arbitrary code, exploit requires crafted WebAssembly code.

CVSS base score 9.8 /10
Critical
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.44% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Memory Corruption
Impact
Remote Code Execution, Denial Of Service
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
29 September 2026
Updated
15 October 2026
Weakness
CWE-824

Vendor fix

Update to Firefox ESR 153.4, Firefox 157, Firefox ESR 140.17 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