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CVE-2026-121953— FreeRDP before 3.32.2 Use-After-Free via rdpgfx Dynamic Virtual Channel Close

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.

FreeRDP 在 3.32.2 版本之前存在一个释放后使用（use-after-free）漏洞，该漏洞位于客户端的 rdpgfx 动态虚拟通道中：一个具有新 ChannelId 的重名通道会覆盖监听器的单个回调槽，而 rdpgfx_on_close 函数在释放时并未清除该槽。恶意 RDP 服务器可打开并关闭此类通道，随后向原始通道发送协议数据单元（PDU），从而导致客户端崩溃，甚至可能实现代码执行。

CVSS 9.8 · Critical

Affected Version Matrix 2

VendorProduct Version RangeStatus
FreeRDP FreeRDP < 3.32.2 affected
3.32.2 unaffected
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I. Basic Information for CVE-2026-121953

Vulnerability Information
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Vulnerability Title
FreeRDP before 3.32.2 Use-After-Free via rdpgfx Dynamic Virtual Channel Close
Source: CVE Program / CVE List V5
Vulnerability Description
FreeRDP before 3.32.2 has a use-after-free in the client's rdpgfx dynamic virtual channel: a duplicate-name channel with a new ChannelId overwrites the listener's single callback slot, which rdpgfx_on_close frees without clearing. A malicious RDP server can open and close such a channel, then send a PDU on the original channel to crash the client or potentially execute code.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
释放后使用
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
FreeRDP FreeRDP 0 ~ 3.32.2 -

II. Public POCs for CVE-2026-121953

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III. Intelligence Information for CVE-2026-121953

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Other References for CVE-2026-121953 (2)

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

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-2026-121951 7.5 HIGH FreeRDP 3.0.0 before 3.32.2 Denial of Service via Slow-Path Input Event
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-416