Input validation error in FreeRDP - #VU137826
Published: July 16, 2026
Vulnerability identifier: #VU137826
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: N/A
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: FreeRDP
Affected software:
FreeRDP
FreeRDP
Detailed vulnerability description
The vulnerability allows a remote attacker to inject headers into HTTP proxy CONNECT requests.
The vulnerability exists due to improper input validation in http_proxy_connect() when processing a server-controlled redirected TargetNetAddress through an HTTP proxy connection. A remote attacker can send a crafted redirection PDU containing CRLF or other control characters to inject headers into HTTP proxy CONNECT requests.
Exploitation requires the client to use an HTTP proxy and to connect to a malicious or compromised RDP server that can send a redirection PDU.
Remediation
Install security update from vendor's website.