CVE-2026-110835
Description
A flaw was found in FreeRDP. A remote, unauthenticated attacker can perform HTTP header injection by submitting a routing token containing an unvalidated line feed character to a FreeRDP proxy configured with dynamic targets and an upstream Hypertext Transfer Protocol (HTTP) proxy. This vulnerability allows the attacker to alter HTTP request framing and inject custom headers into outbound proxy requests, potentially compromising the integrity of communications handled by the upstream proxy.
Statement
This flaw is rated Moderate because HTTP header injection via a crafted proxy routing token has limited integrity impact (I:L) under non-trivial conditions (AC:H). Restrict freerdp-proxy exposure.
Mitigation
Do not expose freerdp-proxy to untrusted clients. Validate/normalize routing tokens and apply CRLF sanitization ([CME-1313](https://cmetaxonomy.org/entries/CME-1313.html)). Restrict proxy access ([CME-202](https://cmetaxonomy.org/entries/CME-202.html)).
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 4 | 5.8 | 4 |
| Attack Vector | Network | Network | Network |
| Attack Complexity | High | Low | High |
| Privileges Required | None | None | None |
| User Interaction | None | None | None |
| Scope | Changed | Changed | Changed |
| Confidentiality | None | None | None |
| Integrity Impact | Low | Low | Low |
| Availability Impact | None | None | None |
Vector
Red Hat: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N
NVD: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
cve.org: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N
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