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    CVE-2026-91769

    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.

    Published:Sep 25, 2026
    Last Modified:Oct 23, 2026
    EPS:Sep 25, 2026
    EPSS Score:0.00135
    CVSS Score:4.3

    Affected Products

    Vendor
    Php
    Product
    Php
    Vendor
    Php Group
    Product
    Php
    Vendor
    Redhat
    Product
    Hummingbird

    Exploits

    https://github.com/php/php-src/security/advisories/GHSA-vvx9-73fr-5jjx

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    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High