MEDIUM 6.5 NVD

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

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.

Remediation

$ sudo apt install --only-upgrade php8.4

References

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

Published: 2026-09-25 · Source: NVD · Feed updated: 2026-09-25

This medium severity vulnerability with a CVSS score of 6.5 was published on 2026-09-25 via NVD. A remediation command is available below.

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