CVE-2026-91769
mediumPriorität · verfolgen · 0EPSS 0.002 · 5. PerzentilDEUSEPSS · bewertet 2026-10-28
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.
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Technischer Schweregrad, 0–10. Eine Zeile je Quelle.
Basiswert 0–10 · höher = schwerwiegender · Vektor überfahren zum Auflösen
SSVC
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schwächen
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betroffene Produkte (28)
Betroffene Produkte und Versionsbereiche.
Advisories (4)
Hersteller- und Ökosystem-Meldungen dazu.
- WID-SEC-W-2026-3585PHP: Mehrere SchwachstellenDeutsch2026-09-24csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen in PHP ausnutzen, um einen Denial of Service Angriff durchzuführen, um Informationen offenzulegen oder die Integrität zu verletzen.
- BIT-libphp-2026-91769TLS Hostname Verification Falls Back to CN After SAN Mismatch2026-10-01vendor · osvUS
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.
- BIT-php-2026-91769TLS Hostname Verification Falls Back to CN After SAN Mismatch2026-10-01vendor · osvUS
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.
- BIT-php-min-2026-91769TLS Hostname Verification Falls Back to CN After SAN Mismatch2026-10-01vendor · osvUS
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.
auch bekannt als (3)
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Referenzen (1) nvd
Externe Belege — Patches, Meldungen, Analysen.
- https://github.com/php/php-src/security/advisories/GHSA-vvx9-73fr-5jjxVendor AdvisoryExploit
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