CVE-2026-56297

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.

CVSS v3 7.0 HIGH

7.0^/10

CVSS v3 : HIGH

Vector :

Exploitability : 2.2 / Impact : 4.7

Attack Vector NETWORK

Attack Complexity HIGH

Privileges Required NONE

User Interaction NONE

Confidentiality Impact LOW

Integrity Impact LOW

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-3mv2-5q57-2v8h	Exploit Vendor Advisory
https://www.vulncheck.com/advisories/freerdp-use-after-free-via-race-condition-in-drdynvc-channel-callback	Third Party Advisory
https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-3mv2-5q57-2v8h	Exploit Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:freerdp:freerdp:*:*:*:*:*:*:*:*

History

10 Jul 2026, 14:36

Type	Values Removed	Values Added
References	~~() https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-3mv2-5q57-2v8h -~~	() https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-3mv2-5q57-2v8h - Exploit, Vendor Advisory
References	~~() https://www.vulncheck.com/advisories/freerdp-use-after-free-via-race-condition-in-drdynvc-channel-callback -~~	() https://www.vulncheck.com/advisories/freerdp-use-after-free-via-race-condition-in-drdynvc-channel-callback - Third Party Advisory
CPE		cpe:2.3:a:freerdp:freerdp::::::::
First Time		Freerdp Freerdp freerdp

08 Jul 2026, 15:16

Type	Values Removed	Values Added
References	~~() https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-3mv2-5q57-2v8h -~~	() https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-3mv2-5q57-2v8h -

08 Jul 2026, 14:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-07-08 14:17

Updated : 2026-07-10 14:36

NVD link : CVE-2026-56297

Mitre link : CVE-2026-56297

CVE.ORG link : CVE-2026-56297

JSON object : View

Products Affected

freerdp

freerdp

CWE

CWE-362

Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

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