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CVE-2026-121951— FreeRDP 3.0.0 before 3.32.2 Denial of Service via Slow-Path Input Event

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 3.32.2 版本之前的服务端中，RDP 对等端输入解析逻辑在处理慢速路径（slow-path）输入事件时，若遇到未知消息类型，会直接跳过该事件六字节的主体部分，而未验证其是否位于数据包声明的长度范围内。这会导致 WinPR 流断言失败。拥有活跃会话的远程 RDP 客户端可发送截断的未知输入事件，从而终止启用了断言检查的服务端进程，引发拒绝服务（DoS）攻击。

CVSS 7.5 · High

Affected Version Matrix 2

VendorProduct Version RangeStatus
FreeRDP FreeRDP 3.0.0< 3.32.2 affected
3.32.2 unaffected
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I. Basic Information for CVE-2026-121951

Vulnerability Information
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Vulnerability Title
FreeRDP 3.0.0 before 3.32.2 Denial of Service via Slow-Path Input Event
Source: CVE Program / CVE List V5
Vulnerability Description
FreeRDP 3.0.0 before 3.32.2 server-side RDP peer input parsing skips the six-byte body of a slow-path input event with an unknown message type without checking it lies within the packet's declared length, causing a WinPR stream assertion failure. A remote RDP client with an active session can send a truncated unknown input event to abort assertion-enabled server processes, causing denial of service.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
可达断言
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
FreeRDP FreeRDP 3.0.0 ~ 3.32.2 -

II. Public POCs for CVE-2026-121951

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III. Intelligence Information for CVE-2026-121951

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Other References for CVE-2026-121951 (2)

Same Patch Batch · FreeRDP · 2026-11-04 · 15 CVEs total

CVE-2026-121953 9.8 CRITICAL FreeRDP before 3.32.2 Use-After-Free via rdpgfx Dynamic Virtual Channel Close
CVE-2026-121952 9.8 CRITICAL FreeRDP before 3.32.2 Proxy Out-of-Bounds Write via Bitmap Cache v2 Capability
CVE-2026-121958 8.8 HIGH FreeRDP through 3.32.1 Heap Out-of-Bounds Write via RDPGFX HashTable_GetKeys
CVE-2026-121962 8.1 HIGH FreeRDP before 3.32.2 Heap Buffer Overflow via Early User Authorization Read
CVE-2026-121964 7.5 HIGH FreeRDP before 3.32.2 Heap Buffer Overflow via rpc_client_recv_fragment
CVE-2026-121957 7.5 HIGH FreeRDP before 3.32.2 Use-After-Free via RDPGFX ResetGraphics Race
CVE-2026-121955 7.5 HIGH FreeRDP before 3.32.2 Use-After-Free in Smartcard Emulation ReleaseContext
CVE-2026-121956 7.5 HIGH FreeRDP before 3.32.2 Double Free in WinPR Kerberos retrieveSomeTgt
CVE-2026-121960 7.5 HIGH FreeRDP before 3.32.2 Unauthenticated Denial of Service via CredSSP TSRequest
CVE-2026-121950 6.5 MEDIUM FreeRDP before 3.32.2 Heap Overflow via RDPGFX CREATE_SURFACE Integer Wrap
CVE-2026-121954 6.5 MEDIUM FreeRDP before 3.32.2 Heap Out-of-Bounds Write in Planar Codec
CVE-2026-121959 6.5 MEDIUM FreeRDP before 3.32.2 Infinite Loop via Truncated WebSocket Frame
CVE-2026-121961 5.9 MEDIUM FreeRDP before 3.32.2 Use-After-Free via DRDYNVC Tracker Race
CVE-2026-121963 5.9 MEDIUM FreeRDP before 3.32.2 Use-After-Free via Dynamic rdpsnd Channel Close

IV. Related Vulnerabilities

Same product: FreeRDP
Same vendor: FreeRDP
Same weakness: CWE-617