Numeric Truncation Error in FortiOS - CVE-2026-126254
Published: November 11, 2026
Vulnerability identifier: #VU165158
CSH Severity: Medium
CVSS v4: 7.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-126254
CWE-ID: CWE-197
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote authenticated user to damange or delete data.
The vulnerability exists due to numeric truncation error. A configured ibgp neighbor can send malicious/malformed attributes to all connected routers via a specially crafted request.
Affected software
FortiOS
How to mitigate CVE-2026-126254
Install update from vendor's website.
FortiOS - addressed in versions 7.2.14, 7.4.13, 7.6.8, 8.0.2