FreeRDP up to 3.28.0 HTTP Proxy http_proxy_connect crlf injection

Summaryinfo

A vulnerability classified as critical was found in FreeRDP up to 3.28.0. Affected is the function http_proxy_connect of the component HTTP Proxy. Executing a manipulation can lead to crlf injection. This vulnerability is tracked as CVE-2026-67289. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability was found in FreeRDP up to 3.28.0. It has been declared as critical. This vulnerability affects the function http_proxy_connect of the component HTTP Proxy. The manipulation with an unknown input leads to a crlf injection vulnerability. The CWE definition for the vulnerability is CWE-93. The product uses CRLF (carriage return line feeds) as a special element, e.g. to separate lines or records, but it does not neutralize or incorrectly neutralizes CRLF sequences from inputs. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-67289 since 07/29/2026. The exploitation appears to be easy. The attack can be initiated remotely. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available.

Upgrading to version 3.29.0 eliminates this vulnerability.

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Productinfo

Type

• Remote Access Software

Name

• FreeRDP

Version

• 3.0
• 3.1
• 3.2
• 3.3
• 3.4
• 3.5
• 3.6
• 3.7
• 3.8
• 3.9
• 3.10
• 3.11
• 3.12
• 3.13
• 3.14
• 3.15
• 3.16
• 3.17
• 3.18
• 3.19
• 3.20
• 3.21
• 3.22
• 3.23
• 3.24
• 3.25
• 3.26
• 3.27
• 3.28.0

License

• open-source

Website

• Product: https://github.com/FreeRDP/FreeRDP/

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