CVE-2026-91769

MediumCVSS 4.3/10Last modified Oct 23, 2026

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 3.1 4.3/10CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Weakness enumeration

CWE-297

Affected software

No affected versions have been published.

Timeline

Published: Sep 25, 2026
Last modified: Oct 23, 2026
NVD status: Analyzed

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