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4.9
Fortinet FortiWeb: Integer Overflow Causes Denial of Service
CVE-2026-39811
Summary
FortiWeb security software versions 8.0.0 through 8.0.3, 7.6.0 through 7.6.6, 7.4, 7.2, and 7.0 have a bug that can cause the software to crash or become unresponsive, potentially disrupting your network's security. This can happen when the software tries to process certain types of data. You should update your FortiWeb software to the latest version to fix this issue.
Original title
A integer overflow or wraparound vulnerability in Fortinet FortiWeb 8.0.0 through 8.0.3, FortiWeb 7.6.0 through 7.6.6, FortiWeb 7.4 all versions, FortiWeb 7.2 all versions, FortiWeb 7.0 all version...
Original description
A integer overflow or wraparound vulnerability in Fortinet FortiWeb 8.0.0 through 8.0.3, FortiWeb 7.6.0 through 7.6.6, FortiWeb 7.4 all versions, FortiWeb 7.2 all versions, FortiWeb 7.0 all versions may allow attacker to denial of service via <insert attack vector here>
nvd CVSS3.1
4.9
Vulnerability type
CWE-190
Integer Overflow
Published: 14 Apr 2026 · Updated: 15 Apr 2026 · First seen: 14 Apr 2026