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

Quick assessment

Affected
FreeRDP FreeRDP
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 FreeRDP 3.0.0 至 3.31.0（不含 3.32.0）版本中，由于其代理功能存在 HTTP 头注入漏洞，具体表现为：在路由令牌（Cookie: msts=）的目标部分中，单独存在的换行符（LF）未被拒绝，而是被 http_proxy_connect 直接写入到 CONNECT 请求行和 Host 头部。 当远程未认证的 RDP 客户端使用 FixedTarget=false 配置，并通过上游 HTTP 代理进行连接时，攻击者可以篡改该上游代理处的 HTTP 请求/头部格式。

CVSS 4.0 · Medium

Possible ATT&CK Techniques 1 AI

T1557 · Adversary-in-the-Middle
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I. Basic Information for CVE-2026-110835

Vulnerability Information
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Vulnerability Title
FreeRDP 3.0.0 before 3.32.0 HTTP Header Injection via Proxy Routing Token
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对CRLF序列的转义处理不恰当(CRLF注入)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
FreeRDP FreeRDP 3.0.0 ~ 3.32.0 -

II. Public POCs for CVE-2026-110835

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III. Intelligence Information for CVE-2026-110835

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Other References for CVE-2026-110835 (2)

Same Patch Batch · FreeRDP · 2026-10-14 · 11 CVEs total

CVE-2026-110838 7.5 HIGH FreeRDP shadow before 3.32.0 Pre-Authentication Input Injection via Confirm Active bypass
CVE-2026-110839 7.1 HIGH FreeRDP 3.3.0 before 3.32.0 Heap Out-of-Bounds Write via Grayscale JPEG Clipboard Data
CVE-2026-110837 7.1 HIGH FreeRDP 2.0.0 before 3.32.0 Heap Buffer Overflow via MP3 Audio Decoding
CVE-2026-110829 6.5 MEDIUM FreeRDP 3.0.0 before 3.32.0 Null Pointer Dereference via rdpsnd Fragment
CVE-2026-110836 6.5 MEDIUM FreeRDP 3.0.0 before 3.32.0 Infinite Loop DoS via Gateway Content-Type
CVE-2026-110834 6.5 MEDIUM FreeRDP 2.0.0 before 3.32.0 Denial of Service via Serial IRP Null Handle
CVE-2026-110832 6.5 MEDIUM FreeRDP 2.0.0 before 3.32.0 Memory Exhaustion via DRDYNVC DATA_FIRST
CVE-2026-110830 5.9 MEDIUM FreeRDP before 3.32.0 Denial of Service via Serial IRP_MJ_CREATE
CVE-2026-110833 5.9 MEDIUM FreeRDP before 3.32.0 Unbounded Memory Retention via RDPDR Proxy
CVE-2026-110831 4.3 MEDIUM FreeRDP 3.13.0 before 3.32.0 Resource Leak via Drive Redirection IRP_MJ_CREATE

IV. Related Vulnerabilities

Same product: FreeRDP
Same vendor: FreeRDP
Same weakness: CWE-93

V. Comments for CVE-2026-110835

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