CVE-2026-91767 — Heap-buffer-overflow in php_openssl_matches_wildcard_name on crafted server cert wildcard CN

Description (CNA)

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 (CNA)

Vendor / product	Versions
PHP Group / PHP	affected 8.2.* before 8.2.34; affected 8.3.* before 8.3.35; affected 8.4.* before 8.4.26; affected 8.5.* before 8.5.11

CWE

CWE-122

References

https://github.com/php/php-src/security/advisories/GHSA-xr7j-rvgx-xq5p

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.