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4.3 Medium

CVE-2026-91769 PHP's OpenSSL stream peer verification checks the certificate's subjectAltName entries first and, whenever no entry…

Description

PHP's OpenSSL stream peer verification checks the certificate's subjectAltName entries first and, whenever no entry matches, falls back to the Common Name. RFC 6125 requires the CN to be ignored once the certificate presents any service identity, so a certificate carrying a non-matching DNS SAN was still accepted when its CN matched the requested peer_name. A certificate trusted by the client for one name can therefore be used to impersonate another.

Affected products and versions

Product Affected versions Fixed in
PHP 8.5 earliest → < 8.5.11 8.5.11
PHP 8.4 earliest → < 8.4.26 8.4.26
PHP 8.3 earliest → < 8.3.35 8.3.35
PHP 8.2 earliest → < 8.2.34 8.2.34

References

Timeline

  1. Published
  2. Last modified

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