FortiOS: numeric truncation error

FortiOS, FortiSASE

A numeric truncation error in FortiOS and FortiSASE may allow a configured ibgp neighbor to send malicious attributes to connected routers.

Do this now

Check the vendor's advisory for a FortiOS fix and restrict BGP iBGP neighbor access to trusted peers meanwhile.

Who should check: teams running VPN & firewalls

First seen: 10 Nov 2026
Last update: 13 Nov 2026, 00:17 UTC
Source: news
On the menu as: VPN & firewalls

Check this repository for exposure to one security incident from pwned.coffee. Report first, change nothing until I say so.

## FortiOS: numeric truncation error
Severity: unknown. Patch status: fix status unknown.
Affected: FortiOS, FortiSASE

A numeric truncation error in FortiOS and FortiSASE may allow a configured ibgp neighbor to send malicious attributes to connected routers.

## Steps
1. This touches infrastructure (vpn-edge). Look in terraform, ansible, cloud-init, Dockerfiles and docs for the product and version we run. If it isn't in the repo, say so and list what a human should check on the box.
2. No source names a fix yet; check the vendor advisory. Until one ships: restrict network access to it.

## Report
A table: file, product or package, version in use, affected yes/no, exact fix. Then anything a human has to check outside the repo.

If you have the pwned.coffee MCP server (https://pwned.coffee/mcp), call lookup_cve for the latest, and check_repo with this repo's lockfiles, Dockerfiles and workflows for a full receipt.
Sources: https://fortiguard.fortinet.com/psirt/FG-IR-26-268
https://pwned.coffee/i/fortios-numeric-truncation-error

Receipt

Exploitation: No known exploitation
Score: No CVSS published yet: severity unknown.
Last checked: 13 Nov 2026, 16:26 UTC

Sources: KEV – CVE record – Vendor –

Sources

filestore.fortinet.com: Numeric truncation error

Follow on X

Totalone coffee