Quick answers
- Is CVE-2026-126258 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-126258 being exploited in the wild.
- How severe is CVE-2026-126258?
- High severity, with a CVSS score of 7.5, published 11 November 2026.
- Which products and versions are affected?
- Fortinet FortiOS 8.0.0, 7.6.7.
- Is there a fix for CVE-2026-126258?
- Yes: fixed in FortiOS 8.0.1 or above, FortiOS 7.6.8 or above. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-126258 attacked?
- It is attacked over the network, in an operating system.
- Am I affected by CVE-2026-126258?
- Check whether you run Fortinet FortiOS 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: FortiOS 8.0.1 or above, FortiOS 7.6.8 or above
Technical details
A stack-based buffer overflow (CWE-121) exists in the FortiOS WAD proxy component. An unauthenticated attacker with network access to the WAD port can trigger the overflow via malicious HTTP or HTTPS requests, causing a crash of proxy or ZTNA sessions. The vulnerability affects FortiOS 8.0.0 and 7.6.7; fixes are available in 8.0.1+ and 7.6.8+.
Affected products
- Fortinet FortiOS 8.0.0, 7.6.7
Timeline
- 2026-11-10: disclosed: Initial publication by Fortinet PSIRT