Integer overflow in Firefox ESR - CVE-2026-8954
Published: May 19, 2026
Vulnerability identifier: #VU131839
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-8954
CWE-ID: CWE-190
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Mozilla
Affected software:
Firefox ESR
Firefox ESR
Detailed vulnerability description
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to incorrect boundary conditions and integer overflow in the Audio/Video component when processing crafted media content. A remote attacker can supply crafted media content to cause a denial of service.
User interaction is required to visit a specially crafted website or URL.
How to mitigate CVE-2026-8954
Install security update from vendor's website.