# CVE-2026-67289: FreeRDP before 3.29.0 HTTP Proxy Request Injection via Redirection

> A malicious RDP server can inject arbitrary headers into HTTP proxy requests via crafted redirection data, requiring proxy usage.

- **Severity:** Critical 9.3 (`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`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 1 Aug 2026
- **Updated:** 5 Aug 2026
- **Also known as:** DEBIAN-CVE-2026-67289, GHSA-3x8f-6ffv-v2wc, GHSA-mwwh-mhp9-q7vm, UBUNTU-CVE-2026-67289

## What is CVE-2026-67289?

CVE-2026-67289 is a critical vulnerability in Freerdp Freerdp, published on 1 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official 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.

Weakness: CWE-113 (Improper Neutralization of CRLF Sequences in HTTP Headers)

## Which versions are affected by CVE-2026-67289?

It affects 1 product.


Products: Freerdp Freerdp.

## How do I fix CVE-2026-67289?

Upgrade to a fixed version.

## Is CVE-2026-67289 being exploited?

There is no known exploitation of CVE-2026-67289 in the wild and no public exploit code.

## Other vulnerabilities in Freerdp Freerdp

- [CVE-2021-37594](https://insights.sbomify.com/CVE-2021-37594/): Other in n/a (critical 9.8)
- [CVE-2021-37595](https://insights.sbomify.com/CVE-2021-37595/): Other in n/a (critical 9.8)
- [CVE-2026-67305](https://insights.sbomify.com/CVE-2026-67305/): FreeRDP Windows Client before 3.29.0 Heap Buffer Overflow via Cliprdr (critical 9.4)
- [CVE-2026-66402](https://insights.sbomify.com/CVE-2026-66402/): FreeRDP before 3.29.0 TLS Certificate Identity Validation Bypass (critical 9.3)
- [CVE-2026-67292](https://insights.sbomify.com/CVE-2026-67292/): FreeRDP before 3.29.0 WebSocket Ping Buffer Over-disclosure (critical 9.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-67289 and fix it if it is affected.

What it is: CVE-2026-67289 is a critical vulnerability in Freerdp Freerdp, published on 1 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-67289 in the wild and no public exploit code.

Affected product: Freerdp Freerdp. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-67289/ (Markdown: https://insights.sbomify.com/CVE-2026-67289/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-67289
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-67289
- OSV: https://osv.dev/vulnerability/CVE-2026-67289

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-67289/
Summaries are generated and may contain mistakes; the official description above is the record.