Quick answers
- Is CVE-2026-126154 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-126154 being exploited in the wild.
- How severe is CVE-2026-126154?
- High severity, with a CVSS score of 7.5, published 11 November 2026.
- Which products and versions are affected?
- Fortinet FortiMail 7.2 all versions, 7.4.0-7.4.8, 7.6.0-7.6.6, 8.0.0-8.0.1.
- Is there a fix for CVE-2026-126154?
- Yes: fixed in FortiMail 7.4.9 and above, 7.6.7 and above, 8.0.2 and above; 7.2 all versions require migration to a fixed release. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-126154 attacked?
- It is attacked over the network, in a network appliance.
- Am I affected by CVE-2026-126154?
- Check whether you run Fortinet FortiMail at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
How to fix
- Fixed in: FortiMail 7.4.9 and above, 7.6.7 and above, 8.0.2 and above; 7.2 all versions require migration to a fixed release
Technical details
An out-of-bounds write vulnerability (CWE-787) in the FortiMail API component allows unauthenticated remote attackers to trigger a denial of service via a specially crafted HTTP request. The vulnerability affects multiple version branches across 7.2, 7.4, 7.6, and 8.0 releases. No exploitation in the wild has been reported.
Affected products
- Fortinet FortiMail 7.2 all versions, 7.4.0-7.4.8, 7.6.0-7.6.6, 8.0.0-8.0.1
Timeline
- 2026-11-10: disclosed
- 2026-10-05: patched: FortiMail Cloud patched via firmware updates to 7.6.7 GA or 8.0.2 GA