CVE-2026-67294
Last modified
CVE-2026-67294 is a critical-severity vulnerability rated 9.3/10 on the CVSS scale. 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. EPSS estimates a 0.27% chance of exploitation in the next 30 days.
Description
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.
Metrics
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
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
Weakness Enumeration
Affected Software
Source: CNA advisory (CVE.org). NVD analysis pending.
| Vendor | Product | Versions |
|---|---|---|
| FreeRDP | FreeRDP | < 3.29.0 |
References
Timeline
- Published
- Last Modified
- Status
- Received
Frequently Asked Questions
What is CVE-2026-67294?
How severe is CVE-2026-67294?
How do I fix CVE-2026-67294?
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2026
- CVE-2026-67289FreeRDP before 3.29.0 (affected versions <= 3.28.0) does not…9.8
- CVE-2026-6729HKUDS OpenHarness prior to PR #159 remediation contains a se…7.6
- CVE-2026-67290FreeRDP before 3.29.0 contains a heap out-of-bounds read vul…8.7
- CVE-2026-67291FreeRDP before 3.29.0 (affected versions <= 3.28.0) contains…8.7
- CVE-2026-67292FreeRDP before 3.29.0 contains a buffer over-disclosure vuln…9.3
- CVE-2026-67293FreeRDP before 3.29.0 (affected versions <= 3.28.0) contains…9.3
- CVE-2026-67295FreeRDP before 3.29.0 fails to properly validate server-supp…6.3
- CVE-2026-67296FreeRDP before 3.29.0 contains a denial of service vulnerabi…8.7
- CVE-2026-67297FreeRDP before 3.29.0 fails to enforce the RESPONSE_SIZE_LIM…8.7
- CVE-2026-67298FreeRDP versions 3.28.0 and earlier contain a heap buffer ov…8.7
- CVE-2026-67299FreeRDP before 3.29.0 contains a client-side heap use-after-…8.7
- CVE-2026-67300FreeRDP before 3.29.0 contains client-side heap use-after-fr…8.7
Are you affected by CVE-2026-67294?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST