CVE-2026-91768

{"id": "CVE-2026-91768", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-91768", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-09-28T12:57:04.931780Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "security@php.net", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 6.5, "attackVector": "ADJACENT_NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 3.6, "exploitabilityScore": 2.8}]}, "affected": [{"source": "security@php.net", "affectedData": [{"vendor": "PHP Group", "product": "PHP", "versions": [{"status": "affected", "version": "8.2.*", "lessThan": "8.2.34", "versionType": "semver"}, {"status": "affected", "version": "8.3.*", "lessThan": "8.3.35", "versionType": "semver"}, {"status": "affected", "version": "8.4.*", "lessThan": "8.4.26", "versionType": "semver"}, {"status": "affected", "version": "8.5.*", "lessThan": "8.5.11", "versionType": "semver"}], "packageName": "PHP-FPM", "defaultStatus": "unaffected"}]}], "published": "2026-09-25T22:18:49.807", "references": [{"url": "https://github.com/php/php-src/security/advisories/GHSA-62xp-839h-2637", "source": "security@php.net"}], "vulnStatus": "Awaiting Analysis", "weaknesses": [{"type": "Secondary", "source": "security@php.net", "description": [{"lang": "en", "value": "CWE-1023"}]}], "descriptions": [{"lang": "en", "value": "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."}], "lastModified": "2026-09-29T21:27:41.130", "sourceIdentifier": "security@php.net"}