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Vulnerabilities in the PHP language itself, and which PHP versions they affect.

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CVE-2026-91767

MEDIUM 6.5 CVSS 3.1
Published
September 25, 2026
Last modified
October 27, 2026
NVD status
Analyzed
Reported by
security@php.net
Weakness
CWE-122
CVSS vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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.

Affected products and versions

  • PHP — From 8.2.0 (including) to 8.2.34 (excluding)
  • PHP — From 8.3.0 (including) to 8.3.35 (excluding)
  • PHP — From 8.4.0 (including) to 8.4.26 (excluding)
  • PHP — From 8.5.0 (including) to 8.5.11 (excluding)

References

  • github.com https://github.com/php/php-src/security/advisories/GHSA-xr7j-rvgx-xq5p Vendor Advisory
  • nvd.nist.gov Official NVD record