CVE-2026-91767
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.
- Score
- CVSS 3.1 6.5 Medium
- Status
- Analyzed - security@php.net
- Published
- 2026-09-25
- Last modified
- 2026-10-27
- Weaknesses
- CWE-122
Affected products
References
- https://github.com/php/php-src/security/advisories/GHSA-xr7j-rvgx-xq5p
