CVE-2026-67289Network attack vectorHinoki check available

HTTP proxy request injection via redirected hostname

Published Aug 1, 2026 · Updated Aug 1, 2026

HTTP request injection in FreeRDP before 3.29.0 allows remote attackers to alter proxy requests through a crafted RDP redirection. The redirection parser accepts control characters in TargetNetAddress, copies it to ServerHostname, and http_proxy_connect() writes it into the CONNECT line and Host header without filtering. The client must use an HTTP proxy and connect to a malicious or compromised RDP server; impact is limited to bytes accepted by the proxy as injected headers or requests.

CVSS severity9.3
Critical
EPSS probability0.40%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

HTTP request injection in FreeRDP before 3.29.0 allows remote attackers to alter proxy requests through a crafted RDP redirection. The redirection parser accepts control characters in TargetNetAddress, copies it to ServerHostname, and http_proxy_connect() writes it into the CONNECT line and Host header without filtering. The client must use an HTTP proxy and connect to a malicious or compromised RDP server; impact is limited to bytes accepted by the proxy as injected headers or requests.

The record

CVE
CVE-2026-67289
Published
Aug 1, 2026
Updated
Aug 1, 2026
Vendor
FreeRDP
Product
FreeRDP
Classifications
CWE-113
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 1, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 1, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <3.29.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

FreeRDP · FreeRDPversion=0 <3.29.0

Published CVSS scores

4.3Amazon LinuxCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
9.8VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.3VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-113Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting')

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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