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CVE-2026-91769 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: [email protected]CVSS-B:4.3 MEDIUMVector:CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/php/php-src/security/advisories/GHSA-vvx9-73fr-5jjx	[email protected]

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-297	Improper Validation of Certificate with Host Mismatch	[email protected]

Affected Products

No affected product data is available for this CVE.

Change History

1 change record found show changes