Numeric Truncation Error in Fortinet FortiOS Product Line
CVE-2026-126254

9.6CRITICAL

Key Information:

Vendor

Fortinet
Status
FortiOS
Vendor
CVE Published:
11 November 2026

What is CVE-2026-126254?

Fortinet FortiOS versions 8.0.0 to 8.0.1, 7.6.0 to 7.6.7, 7.4.0 to 7.4.12, and 7.2.0 to 7.2.13 are exposed to a numeric truncation error. This vulnerability enables a configured ibgp neighbor to exploit the system by sending malicious or malformed attributes through specially crafted requests to all connected routers, potentially leading to severe security implications.

Affected Version(s)

FortiOS 8.0.0 <= 8.0.1

FortiOS 7.6.0 <= 7.6.7

FortiOS 7.4.0 <= 7.4.12

References

https://fortiguard.fortinet.com/psirt/FG-IR-26-268

CVSS V3.1

Score:
9.6
Severity:
CRITICAL
Confidentiality:
None
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.