Buffer overflow in Mozilla Firefox and Firefox for Android - CVE-2026-113399
Published: October 21, 2026
Vulnerability identifier: #VU156680
CSH Severity: Medium
CVSS v4: 6.9 [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]
CVE-ID: CVE-2026-113399
CWE-ID: CWE-119
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to potentially cause a denial of service through out-of-bounds memory access.
The vulnerability exists due to incorrect boundary conditions in the Firefox SVG component when processing SVG content. A remote attacker can lure a victim into viewing specially crafted SVG content to potentially trigger out-of-bounds memory access and crash the browser.
Affected software
Mozilla Firefox
Firefox for Android
Firefox for Android
How to mitigate CVE-2026-113399
Install security update from vendor's website.
Mozilla Firefox - update to 158.0.1
Firefox for Android - update to 158.0.1
Firefox for Android - update to 158.0.1