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CVE-2026-91769

nvd nist
Published: Sep 25, 2026Modified: Oct 23, 2026

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4.3
Vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Exploitability: 2.8 / Impact: 1.4
Source: security@php.net (Secondary)

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 (4)

Products: Php: Php
Php
1 product
Php
Configuration A
4 vulnerable
Vulnerable SoftwareAffected Versions
Php
Php
8.2.0 ≤ version < 8.2.34
Php
8.3.0 ≤ version < 8.3.35
Php
8.4.0 ≤ version < 8.4.26
Php
8.5.0 ≤ version < 8.5.11

Related CWEs

CWE-297
Improper Validation of Certificate with Host Mismatch
The product communicates with a host that provides a certificate, but the product does not properly ensure that the certificate is actually associated with that host.

References (1)

Source: security@php.net
Vendor AdvisoryExploit

Timeline

No history available yet.