CRITICALVulnerability
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NVD CRITICAL: CVE-2026-66402 — FreeRDP before 3.29.0 (affected versions <= 3.28.0) contains multiple TLS certif...

·Source: NIST NVD

Updated:

Executive Summary

FreeRDP before 3.29.0 (affected versions <= 3.28.0) contains multiple TLS certificate identity validation weaknesses in tls_verify_certificate(), tls_match_hostname(), and x509_utils_get_dns_names(). Because FreeRDP performs custom Common Name and DNS SAN string matching instead of using OpenSSL's length-aware identity validation APIs, it (1) truncates DNS SAN values at embedded NUL bytes (accepti

Analysis

FreeRDP before 3.29.0 (affected versions <= 3.28.0) contains multiple TLS certificate identity validation weaknesses in tls_verify_certificate(), tls_match_hostname(), and x509_utils_get_dns_names(). Because FreeRDP performs custom Common Name and DNS SAN string matching instead of using OpenSSL's length-aware identity validation APIs, it (1) truncates DNS SAN values at embedded NUL bytes (accepting e.g. 'victim.example\0.attacker.example' as 'victim.example'), (2) accepts a matching Common Name even when non-matching DNS SAN entries are present, and (3) accepts IP-literal targets via DNS/CN matching without comparing iPAddress SANs. Under a trusted or misissued certificate chain, an attacker positioned to present such a certificate can bypass server identity verification, weakening TLS server authentication. CVSS Score: 9.8. Published: 2026-08-01T13:16:57.487.

Indicators of Compromise (1)

CVE (1)
CVE-2026-66402
NVDMITRE CVE
Source Attribution

Originally published by NIST NVD on Aug 1, 2026. Verified by: NIST.

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