Buffer overflow in Firefox ESR - CVE-2026-8974

 

Buffer overflow in Firefox ESR - CVE-2026-8974

Published: May 19, 2026


Vulnerability identifier: #VU131849
CSH Severity: High
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber
CVE-ID: CVE-2026-8974
CWE-ID: CWE-119
Exploitation vector: Remote access
Exploit availability: No public exploit available
Vendor: Mozilla
Affected software:
Firefox ESR

Detailed vulnerability description

The vulnerability allows a remote attacker to execute arbitrary code.

The vulnerability exists due to memory corruption in multiple unspecified components when processing crafted web content. A remote attacker can trigger memory corruption to execute arbitrary code.

Some of the bugs showed evidence of memory corruption.


How to mitigate CVE-2026-8974

Install security update from vendor's website.

Sources