CVE-2026-56297 | FreeRDP before 3.22.0 contains a use-after-free vulnerabilit… | CVSS 7.0 HIGH

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.

Metadata

CVE ID: CVE-2026-56297
State: PUBLISHED
Assigner: VulnCheck
Reserved: 2026-06-20 12:49 UTC
Published: 2026-07-08 13:49 UTC
Last updated: 2026-07-08 14:23 UTC
Primary CWE: CWE-362
Concurrent Execution using Shared Resource with Improper Syn…
Vendor / Product: FreeRDP / FreeRDP
Sources: cve.org · NVD

Severity & Metrics

7.0 HIGH CVSS 3.1

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H

SSVC — CISA Coordinator

Exploitation: PoC
Automatable: no
Tech. Impact: partial

Affected products (1)

Vendor	Product	Platform	Versions
FreeRDP	FreeRDP	—	0 < 3.22.0, 3.22.0

Weakness (CWE)

CWE	Source	Description
CWE-362	cna	Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

CVSS scores (2)

Score	Severity	Version	Source	Vector
8.3	HIGH	4.0	cna	CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N
7.0	HIGH	3.1	cna	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H

References (2)

GitHub Security Advisory (GHSA-3mv2-5q57-2v8h) https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-3mv2-5q57-2v8h
VulnCheck Advisory: 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