CVE-2026-67294
Fixed in a distro release EPSS <1%CVSS 5.9
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.
Products: FreeRDP
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| Amazon Linux 2 | freerdp | 2:2.11.7-1.amzn2.0.14 |
| Amazon Linux 2 | freerdp-devel | 2:2.11.7-1.amzn2.0.14 |
| Amazon Linux 2 | freerdp-libs | 2:2.11.7-1.amzn2.0.14 |
| Amazon Linux 2 | libwinpr | 2:2.11.7-1.amzn2.0.14 |
| Amazon Linux 2 | libwinpr-devel | 2:2.11.7-1.amzn2.0.14 |
| Amazon Linux 2023 | freerdp | 2:3.6.3-1.amzn2023.0.15 |
| Amazon Linux 2023 | freerdp-devel | 2:3.6.3-1.amzn2023.0.15 |
| Amazon Linux 2023 | freerdp-libs | 2:3.6.3-1.amzn2023.0.15 |
| Amazon Linux 2023 | freerdp-server | 2:3.6.3-1.amzn2023.0.15 |
| Amazon Linux 2023 | libwinpr | 2:3.6.3-1.amzn2023.0.15 |
| Amazon Linux 2023 | libwinpr-devel | 2:3.6.3-1.amzn2023.0.15 |
| Debian 12 | freerdp2 | no fix |
| Debian 13 | freerdp3 | no fix |
| Debian 14 | freerdp3 | 3.29.0+dfsg-1 |
| Ubuntu 16.04 LTS | freerdp | no fix |
| Ubuntu 18.04 LTS | freerdp | no fix |
| Ubuntu 22.04 LTS | freerdp2 | no fix |
| Ubuntu 24.04 LTS | freerdp3 | 3.30.0+dfsg-0ubuntu0.24.04.1 |
| Ubuntu 26.04 LTS | freerdp3 | 3.30.0+dfsg-0ubuntu0.26.04.1 |
| Ubuntu Pro 18.04 LTS | freerdp2 | no fix |
| Ubuntu Pro 20.04 LTS | freerdp2 | no fix |
| Ubuntu Pro 24.04 LTS | freerdp2 | no fix |