CVE-2026-67289

critical · 9.3

FreeRDP before 3.29.0 (affected versions <= 3.28.0) does not validate CRLF and control characters in the server-controlled RDP redirection TargetNetAddress field. This value is copied into the client's ServerHostname and, when the client connects through an HTTP proxy, is written directly into the proxy CONNECT request line and Host header by http_proxy_connect() without filtering. A malicious or compromised RDP server can send a crafted redirection PDU containing embedded control characters to inject arbitrary headers/requests into the HTTP proxy CONNECT request.

9.3

CVSS

0.4%

EPSS (exploit prob.)

34th

EPSS percentile

2026-08-01

Published

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

Weaknesses

CWE-113

References

https://github.com/FreeRDP/FreeRDP/commit/f3b4347105114fe7453828736bea069999af319f
https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-mwwh-mhp9-q7vm
https://www.vulncheck.com/advisories/freerdp-before-http-proxy-request-injection-via-redirection

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2026-67289