medium6.5
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…
Impact
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 products
| Vendor | Product | Affected versions |
|---|---|---|
| Php | Php | from 8.2.0 before 8.2.34 from 8.3.0 before 8.3.35 from 8.4.0 before 8.4.26 from 8.5.0 before 8.5.11 |