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CVE-2026-56297— FreeRDP - Use-After-Free via Race Condition in DRDYNVC Channel Callback

Quick assessment

Affected
FreeRDP FreeRDP
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

FreeRDP是FreeRDP团队开源的一款开源的远程桌面协议(RDP)的实现。 FreeRDP 3.22.0之前版本存在竞争条件问题漏洞，该漏洞源于dvcman_channel_close和dvcman_call_on_receive中channel_callback访问同步不当，导致释放后重用，恶意RDP服务器可能通过并发发送DYNVC_DATA和DYNVC_CLOSE消息触发竞争条件，造成堆释放后重用，可能导致远程代码执行或拒绝服务。

CVSS 7.0 · High EPSS 0.36% · P29

Affected Version Matrix 2

VendorProduct Version RangeStatus
FreeRDP FreeRDP < 3.22.0 affected
3.22.0 unaffected
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I. Basic Information for CVE-2026-56297

Vulnerability Information
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Vulnerability Title
FreeRDP - Use-After-Free via Race Condition in DRDYNVC Channel Callback
Source: CVE Program / CVE List V5
Vulnerability Description
FreeRDP before 3.22.0 contains a use-after-free vulnerability in dvcman_channel_close and dvcman_call_on_receive due to improper synchronization of channel_callback access. A malicious RDP server can trigger a race condition by sending DYNVC_DATA and DYNVC_CLOSE messages concurrently, causing heap-use-after-free in the drdynvc client thread and potentially enabling remote code execution or denial of service.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/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
Vulnerability Title
FreeRDP 竞争条件问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
FreeRDP是FreeRDP团队开源的一款开源的远程桌面协议(RDP)的实现。 FreeRDP 3.22.0之前版本存在竞争条件问题漏洞，该漏洞源于dvcman_channel_close和dvcman_call_on_receive中channel_callback访问同步不当，导致释放后重用，恶意RDP服务器可能通过并发发送DYNVC_DATA和DYNVC_CLOSE消息触发竞争条件，造成堆释放后重用，可能导致远程代码执行或拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
FreeRDP FreeRDP 0 ~ 3.22.0 -

II. Public POCs for CVE-2026-56297

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 8305 chars
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III. Intelligence Information for CVE-2026-56297

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Vendor Advisories for CVE-2026-56297 (2)

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-56297

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