CVE-2026-67294

mediumCVSS 5.9covered by 1 sourcefirst seen 2026-08-01

FreeRDP before 3.29.0 improperly validates the Extended Key Usage (EKU) purpose of the peer certificate during client-side server TLS authentication. In x509_utils_verify(), when server-purpose (X509_PURPOSE_SSL_SERVER) verification fails, the code falls back to client-purpose and any-purpose verification, so a trusted, hostname-matching certificate valid only for clientAuth can be accepted as the RDP server certificate. In environments relying on EKU separation between client and server certificates, this allows a clientAuth-only certificate issued by a trusted CA to bypass server certificate purpose validation.

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Advisory coverage (1)

mediumCVE-2026-67294: FreeRDP before 3.29.0 improperly validates the Extended Key Usage (EKU) purpose of the peer ce…nvd · 2026-08-01

External references

NVD record for CVE-2026-67294

CVE.org record

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