CVE-2026-91767 — Vulnerability intelligence
php — php
Published:
- CVSS
- 6.5
- CISA KEV
- Not listed; not proof of no exploitation
Original source text (not a translation)
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.