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CVE-2026-121963— FreeRDP before 3.32.2 Use-After-Free via Dynamic rdpsnd 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，该漏洞位于异步动态 rdpsnd 通道中。恶意 RDP 服务器可通过在通道中排队音频 PDU 后关闭该通道，从而触发已释放回调的访问。攻击者可先发送一个训练 PDU，随后关闭通道，导致播放线程在 中读取已被释放的回调函数，最终造成客户端崩溃。

CVSS 5.9 · Medium

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

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-2026-121963

Vulnerability Information
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Vulnerability Title
FreeRDP before 3.32.2 Use-After-Free via Dynamic rdpsnd Channel Close
Source: CVE Program / CVE List V5
Vulnerability Description
FreeRDP before 3.32.2 contains a use-after-free vulnerability in the asynchronous dynamic rdpsnd channel that allows malicious RDP servers to trigger freed callback access by closing the channel with queued audio PDUs. Attackers can send a training PDU then close the channel so the playback thread reads the freed callback in rdpsnd_virtual_channel_write, crashing the client.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
使用共享资源的并发执行不恰当同步问题(竞争条件)
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-2026-121963

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III. Intelligence Information for CVE-2026-121963

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Other References for CVE-2026-121963 (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-2026-121951 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

IV. Related Vulnerabilities

Same product: FreeRDP
Same vendor: FreeRDP
Same weakness: CWE-362