Intel

CVE-2026-67289

freerdp: Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting') (CVE-2026-67289)

criticalEPSS 0.4%

Description

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.

Source: NVD (NIST)CVE.org (MITRE)cvelistv5

Affected products

The following versions are affected. Older releases of the same product line are also vulnerable unless stated otherwise.

freerdpfreerdp
3.29.0fixed from 3.29.0

Metrics

XIEM Effective CVSS
9.8
Source: cna-v3
EPSS percentile
35.1 %
Elevated — this CVE ranks above at least 10% of all CVEs scored today.
KEV status
—
Show all metrics
Severity
critical
Priority score
80.23
Exploit maturity
no public PoC known
CVSS v3
7.5
CVSS v4
9.3
EPSS score
0.4 %
Low — model estimates < 1% exploitation likelihood.
Published
2026-08-01 13:16 UTC
CWE
CWE-113

Weakness classes (CWE)

  • CWE-113Variant

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

    The product receives data from an HTTP agent/component (e.g., web server, proxy, browser, etc.), but it does not neutralize or incorrectly neutralizes CR and LF characters before the data is included in outgoing HTTP headers.

    cwe.mitre.org →

References & sources

Reanalysis & status changes

Chronological NVD audit events for this CVE — reanalyses, CVSS updates, CPE diffs.

  1. Initial Analysis2026-10-02 19:12 UTC· nvd@nist.gov
    • CVSS V3.1: AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
    • CPE Configuration: OR *cpe:2.3:a:freerdp:freerdp:*:*:*:*:*:*:*:* versions up to (excluding) 3.29.0
    • Reference Type: VulnCheck: https://github.com/FreeRDP/FreeRDP/commit/f3b4347105114fe7453828736bea069999af319f Types: Patch
    • Reference Type: VulnCheck: https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-mwwh-mhp9-q7vm Types: Exploit, Mitigation, Vendor Advisory
  2. CVE Modified2026-08-05 14:17 UTC· 134c704f-9b21-4f2e-91b3-4a467353bcc0
    • SSVC: {"id":"CVE-2026-67289","role":"CISA Coordinator","options":[{"exploitation":"none"},{"automatable":"yes"},{"technical… → {"id":"CVE-2026-67289","role":"CISA Coordinator","options":[{"exploitation":"none"},{"automatable":"yes"},{"technical…
    • Reference: https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-mwwh-mhp9-q7vm
  3. CVE Modified2026-08-03 19:16 UTC· 134c704f-9b21-4f2e-91b3-4a467353bcc0
    • Reference: https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-mwwh-mhp9-q7vm
    • SSVC: {"id":"CVE-2026-67289","role":"CISA Coordinator","options":[{"exploitation":"poc"},{"automatable":"yes"},{"technicalI…

Linked advisories