{"attribution":"This product uses data from the NVD API but is not endorsed or certified by the NVD.","cve":{"id":"CVE-2026-91767","sourceIdentifier":"security@php.net","published":"2026-09-25T21:17:24.793","lastModified":"2026-10-27T13:14:13.607","vulnStatus":"Analyzed","cveTags":[],"descriptions":[{"lang":"en","value":"php_openssl_matches_wildcard_name() in ext/openssl/xp_ssl.c underflows the length argument passed to memchr() when a TLS server certificate presents a wildcard name whose literal characters are together longer than the hostname being verified. A malicious server presenting such a certificate makes the PHP client read up to SIZE_MAX bytes past the end of a heap allocation. The path is reachable from any default client stream, because verify_peer_name is enabled by default."}],"affected":[{"source":"security@php.net","affectedData":[{"vendor":"PHP Group","product":"PHP","defaultStatus":"unaffected","packageName":"ext-openssl","versions":[{"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","status":"affected"}]}]}],"metrics":{"cvssMetricV31":[{"source":"security@php.net","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","baseScore":6.5,"baseSeverity":"MEDIUM","attackVector":"ADJACENT_NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"NONE","availabilityImpact":"NONE"},"exploitabilityScore":2.8,"impactScore":3.6},{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","baseScore":6.5,"baseSeverity":"MEDIUM","attackVector":"ADJACENT_NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":2.8,"impactScore":3.6}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-09-28T12:56:38.307648Z","id":"CVE-2026-91767","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"weaknesses":[{"source":"security@php.net","type":"Secondary","description":[{"lang":"en","value":"CWE-122"}]}],"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:php:php:*:*:*:*:*:*:*:*","versionStartIncluding":"8.2.0","versionEndExcluding":"8.2.34","matchCriteriaId":"AAFB3643-4D71-46ED-8184-DDE5FE41CD02"},{"vulnerable":true,"criteria":"cpe:2.3:a:php:php:*:*:*:*:*:*:*:*","versionStartIncluding":"8.3.0","versionEndExcluding":"8.3.35","matchCriteriaId":"FF664EE8-D417-45A4-84DF-158F5073FDE8"},{"vulnerable":true,"criteria":"cpe:2.3:a:php:php:*:*:*:*:*:*:*:*","versionStartIncluding":"8.4.0","versionEndExcluding":"8.4.26","matchCriteriaId":"52D4BECA-EF0D-4180-837C-AEFA7A12D243"},{"vulnerable":true,"criteria":"cpe:2.3:a:php:php:*:*:*:*:*:*:*:*","versionStartIncluding":"8.5.0","versionEndExcluding":"8.5.11","matchCriteriaId":"308803C0-9FC8-40D2-8920-B83BCC48014F"}]}]}],"references":[{"url":"https://github.com/php/php-src/security/advisories/GHSA-xr7j-rvgx-xq5p","source":"security@php.net","tags":["Vendor Advisory"]}]}}