CVE-2026-126149 Integer overflow in FortiMail
Remote unauthenticated attackers can crash the FortiMail daemon via an integer overflow.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Harmful if only installed
- No
- Needs a specific call
- No
- Fix
- None listed
What is CVE-2026-126149?
CVE-2026-126149 is a high-severity integer overflow vulnerability in Fortinet FortiMail, published on 11 Nov 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A integer overflow or wraparound vulnerability in Fortinet FortiMail 8.0.0 through 8.0.1, FortiMail 7.6.0 through 7.6.6, FortiMail 7.4.0 through 7.4.8, FortiMail 7.2 all versions may allow a remote unauthenticated attacker to crash the daemon.
Weakness: CWE-190
Which versions are affected by CVE-2026-126149?
An affected version is exposed as installed. No special setting or call is needed.
How do I fix CVE-2026-126149?
No fix has been published for CVE-2026-126149 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Check arithmetic on sizes and lengths before using the result. More about Integer overflow.
Is CVE-2026-126149 being exploited?
There is no known exploitation of CVE-2026-126149 in the wild and no public exploit code.
Sources
Also known as GHSA-cmjf-9f9h-8fvg.