Heap-buffer-overflow in php_openssl_matches_wildcard_name on crafted server cert wildcard CN
At a glance
Severity
MEDIUM 6.5
EPSS
EPSS 0.10 % · percentile 1 (2026-10-27)
State
PUBLISHED
Published
Updated
Assigner
php
NVD status
Analyzed
Description
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.
