Is CVE-2026-126161 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-126161 being exploited in the wild.

How severe is CVE-2026-126161?

High severity, with a CVSS score of 7.5, published 11 November 2026.

Which products and versions are affected?

Fortinet FortiMail 8.0.0 through 8.0.1, 7.6.0 through 7.6.6, 7.4.0 through 7.4.6.

Is there a fix for CVE-2026-126161?

Yes: fixed in FortiMail 8.0.2 or above, 7.6.7 or above, 7.4.9 or above. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-126161 attacked?

It is attacked over the network, in a network appliance.

Am I affected by CVE-2026-126161?

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.

CVE-2026-126161: Fortinet FortiMail uncontrolled resource consumption

CVE-2026-126161 · Severity: high · CVSS 7.5 · Published 2026-11-11

FortiMail is an email security appliance that protects organizations from malicious emails and spam. An attacker can remotely trigger a denial of service by sending repeated unauthenticated requests, causing the system to become unavailable and disrupting email delivery.

Technologies: Fortinet FortiMail. Vendors: Fortinet.

Quick answers

Is CVE-2026-126161 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-126161 being exploited in the wild.
How severe is CVE-2026-126161?: High severity, with a CVSS score of 7.5, published 11 November 2026.
Which products and versions are affected?: Fortinet FortiMail 8.0.0 through 8.0.1, 7.6.0 through 7.6.6, 7.4.0 through 7.4.6.
Is there a fix for CVE-2026-126161?: Yes: fixed in FortiMail 8.0.2 or above, 7.6.7 or above, 7.4.9 or above. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-126161 attacked?: It is attacked over the network, in a network appliance.
Am I affected by CVE-2026-126161?: 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 8.0.2 or above, 7.6.7 or above, 7.4.9 or above

Technical details

Uncontrolled resource consumption (CWE-400) in the API component allows remote, unauthenticated attackers to exhaust system resources via repeated POST requests. The vulnerability requires network access but no authentication or user interaction. The impact is denial of service, making the email security system unavailable.

Affected products

Fortinet FortiMail 8.0.0 through 8.0.1, 7.6.0 through 7.6.6, 7.4.0 through 7.4.6

Timeline

2026-10-05: patched: FortiMail Cloud patched to v7.6.7 GA or v8.0.2 GA
2026-11-10: advisory: Advisory published

References

https://fortiguard.fortinet.com/psirt/FG-IR-26-213

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