Improper Certificate Validation Affecting freerdp3 package, versions <3.29.0+dfsg-1


Severity

Recommended
0.0
medium
0
10

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Threat Intelligence

EPSS
0.27% (20th percentile)

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  • Snyk IDSNYK-DEBIAN14-FREERDP3-18505565
  • published2 Aug 2026
  • disclosed1 Aug 2026

Introduced: 1 Aug 2026

NewCVE-2026-67294  (opens in a new tab)
CWE-295  (opens in a new tab)

How to fix?

Upgrade Debian:14 freerdp3 to version 3.29.0+dfsg-1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream freerdp3 package and not the freerdp3 package as distributed by Debian. See How to fix? for Debian:14 relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1