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9.6
CVE-2026-126254: FortiOS may let crafted iBGP data affect routers
CVE-2026-126254 · published today
Summary
Certain versions of FortiOS can mishandle specially crafted iBGP information, allowing a neighboring router to send bad data to all routers it talks to. This could disrupt routing or expose network information. Update FortiOS to the latest release or apply the vendor's recommended patch.
What to do
The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.
Affected software
| Vendor | Product | Affected versions |
|---|---|---|
| fortinet | fortios | <= 8.0.1 |
Original advisory text
A numeric truncation error vulnerability in Fortinet FortiOS 8.0.0 through 8.0.1, FortiOS 7.6.0 through 7.6.7, FortiOS 7.4.0 through 7.4.12, FortiOS 7.2.0 through 7.2.13 may allow a configured ibgp...
A numeric truncation error vulnerability in Fortinet FortiOS 8.0.0 through 8.0.1, FortiOS 7.6.0 through 7.6.7, FortiOS 7.4.0 through 7.4.12, FortiOS 7.2.0 through 7.2.13 may allow a configured ibgp neighbor to send malicious/malformed attributes to all connected routers via a specially crafted request
Internet-facing
60 days
Internal
At next upgrade
- Not known to be exploited
- Needs hands-on effort to exploit (estimated)
- Gives an attacker partial control (estimated)
Type
CWE-197Numeric Truncation Error
Timeline
Published11 Nov 2026
Updated11 Nov 2026
First seen11 Nov 2026
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