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CVE

CVE-2026-67294

FreeRDP before 3.29.0 TLS Certificate EKU Bypass
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CVE

CVE-2026-67294

FreeRDP before 3.29.0 TLS Certificate EKU Bypass

FreeRDP before 3.29.0 improperly validates the Extended Key Usage (EKU) purpose of the peer certificate during client-side server TLS authentication. In x509utilsverify(), when server-purpose (X509PURPOSESSL_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.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
9.3
-
4.0
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
C
H
U
0
-
C
H
U
-

Related Resources

No items found.

References

https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/67xxx/CVE-2026-67294.json, https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-89c6-jjrw-96h4, https://nvd.nist.gov/vuln/detail/CVE-2026-67294, https://www.vulncheck.com/advisories/freerdp-before-tls-certificate-eku-bypass, https://github.com/FreeRDP/FreeRDP/commit/f3b4347105114fe7453828736bea069999af319f

Severity

0

CVSS Score
0
10

Basic Information

Base CVSS
0
EPSS Probability
0.00266%
EPSS Percentile
0.18553%
Introduced Version
0
Fix Available
f3b4347105114fe7453828736bea069999af319f,3.30.0+dfsg-0ubuntu0.24.04.1,2:2.11.7-1.amzn2.0.14,2:3.6.3-1.amzn2023.0.15

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