CVE-2026-91769

Published: Set 25, 2026 Last Modified: Set 25, 2026
ExploitDB:
Other exploit source:
Google Dorks:
MEDIUM 4,3
Source: [email protected]
Attack Vector: adjacent_network
Attack Complexity: low
Privileges Required: none
User Interaction: none
Scope: unchanged
Confidentiality: low
Integrity: none
Availability: none

Description

AI Translation Available

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.

297

Improper Validation of Certificate with Host Mismatch

Incomplete
Abstraction: Variant Structure: Simple
Common Consequences
Security Scopes Affected:
Access Control Authentication Other
Potential Impacts:
Gain Privileges Or Assume Identity Other
Applicable Platforms
Technologies: Not Technology-Specific, Mobile, Web Based
Likelihood of Exploit: High
View CWE Details
https://github.com/php/php-src/security/advisories/GHSA-vvx…
https://github.com/php/php-src/security/advisories/GHSA-vvx9-73fr-5jjx