Out-of-bounds read in FortiOS - CVE-2026-126256
Published: November 11, 2026
Vulnerability identifier: #VU165159
CSH Severity: Medium
CVSS v4: 8.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-126256
CWE-ID: CWE-125
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote non-authenticated attacker to damange or delete data.
The vulnerability exists due to out-of-bounds read in kernel. A remote privileged attacker can execute arbitrary code or command via crafted paquets.
Affected software
FortiOS
How to mitigate CVE-2026-126256
Install update from vendor's website.
FortiOS - addressed in versions 7.6.8, 8.0.2