# CVE-2026-110835: FreeRDP 3.0.0 before 3.32.0 HTTP Header Injection via Proxy Routing Token

> Remote attackers can inject HTTP headers via proxy routing tokens in FreeRDP, altering request framing at upstream proxies.

- **Severity:** Medium 6.3 (`CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/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:** 14 Oct 2026
- **Updated:** 18 Oct 2026
- **Also known as:** DEBIAN-CVE-2026-110835, GHSA-3qf2-fpqv-9jfj, GHSA-87v8-2gwr-ww9j, UBUNTU-CVE-2026-110835

## What is CVE-2026-110835?

CVE-2026-110835 is a medium-severity vulnerability in Freerdp Freerdp, published on 14 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

FreeRDP 3.0.0 before 3.32.0 allows HTTP header injection in its proxy because a lone LF in the target portion of a routing token (Cookie: msts=) is not rejected and is written by http_proxy_connect into the CONNECT request line and Host header. A remote unauthenticated RDP client connecting to a proxy using FixedTarget=false and an upstream HTTP proxy can alter HTTP request/header framing at that upstream proxy.

Weakness: CWE-93 (Improper Neutralization of CRLF Sequences)

## Which versions are affected by CVE-2026-110835?

It affects 1 product.


Products: Freerdp Freerdp.

## How do I fix CVE-2026-110835?

Upgrade to a fixed version.

## Is CVE-2026-110835 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-110835 exists.

## 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-2026-67289](https://insights.sbomify.com/CVE-2026-67289/): FreeRDP before 3.29.0 HTTP Proxy Request Injection via Redirection (critical 9.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-110835 and fix it if it is affected.

What it is: CVE-2026-110835 is a medium-severity vulnerability in Freerdp Freerdp, published on 14 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-110835 exists.

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-2026-110835/ (Markdown: https://insights.sbomify.com/CVE-2026-110835/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-110835
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-110835
- OSV: https://osv.dev/vulnerability/CVE-2026-110835

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-110835/
Summaries are generated and may contain mistakes; the official description above is the record.