{"id":"CVE-2026-91768","revision":"ec3315a561e844d8b7259b4b06bf64ab","records":[{"revision":"ec3315a561e844d8b7259b4b06bf64ab","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-91768","aliases":[],"title":"IPv6 ACL bypass in FastCGI listen.allowed_clients due to partial address comparison (memcmp 12 bytes)","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.","state":0,"publishedAt":"2026-09-25T21:07:30.95+00:00","modifiedAt":"2026-09-28T13:31:31.382+00:00","affected":[{"ecosystem":"Vendor product","name":"PHP-FPM","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"PHP Group\",\n                    \"product\": \"PHP\",\n                    \"packageName\": \"PHP-FPM\",\n                    \"versions\": [\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"8.2.*\",\n                            \"lessThan\": \"8.2.34\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"8.3.*\",\n                            \"lessThan\": \"8.3.35\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"8.4.*\",\n                            \"lessThan\": \"8.4.26\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"8.5.*\",\n                            \"lessThan\": \"8.5.11\",\n                            \"versionType\": \"semver\"\n                        }\n                    ],\n                    \"defaultStatus\": \"unaffected\"\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","score":6.5,"severity":"MEDIUM"}],"references":["https://github.com/php/php-src/security/advisories/GHSA-62xp-839h-2637"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-91768","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-91768","identifiers":["CVE-2026-91768"]},"retained":false,"historicalAffected":[]}],"coverage":[]}