{"id":"CVE-2026-91768","published":"2026-09-25T22:18:49.807","lastModified":"2026-09-29T21:27:41.130","description":"The IPv6 branch of the FastCGI client access check compares only the first 12 bytes of a 16-byte IPv6 address, so listen.allowed_clients matches on a /96 prefix instead of the exact address. An attacker who can source an address sharing the first 96 bits with an allowed one passes the check and reaches the FastCGI endpoint.","cvssScore":6.5,"cvssSeverity":"MEDIUM","cvssVector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","cwes":["CWE-1023"],"vendors":[],"products":[],"references":[{"url":"https://github.com/php/php-src/security/advisories/GHSA-62xp-839h-2637","tags":[]}],"exploitRefs":[{"url":"https://github.com/php/php-src/security/advisories/GHSA-62xp-839h-2637","tags":[]}],"hasPoc":true,"ai":null}