{"id":"BIT-libphp-2026-91768","summary":"IPv6 ACL bypass in FastCGI listen.allowed_clients due to partial address comparison (memcmp 12 bytes)","details":"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.","aliases":["BIT-php-2026-91768","BIT-php-min-2026-91768","CVE-2026-91768"],"modified":"2026-10-01T10:11:17.418797528Z","published":"2026-10-01T09:29:26.219Z","database_specific":{"severity":"Medium","cpes":["cpe:2.3:a:php:php:*:*:*:*:*:*:*:*"]},"references":[{"type":"WEB","url":"https://github.com/php/php-src/security/advisories/GHSA-62xp-839h-2637"},{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-91768"}],"affected":[{"package":{"name":"libphp","ecosystem":"Bitnami","purl":"pkg:bitnami/libphp"},"ranges":[{"type":"SEMVER","events":[{"introduced":"8.2.0"},{"fixed":"8.2.34"},{"introduced":"8.3.0"},{"fixed":"8.3.35"},{"introduced":"8.4.0"},{"fixed":"8.4.26"},{"introduced":"8.5.0"},{"fixed":"8.5.11"}]}],"database_specific":{"source":"https://github.com/bitnami/vulndb/tree/main/data/libphp/BIT-libphp-2026-91768.json"},"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"}]}],"schema_version":"1.9.0"}