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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.

PUBLISHED Reserved 2026-06-20 | Published 2026-07-08 | Updated 2026-07-08 | Assigner VulnCheck




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

Problem types

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

Product status

Default status
unaffected

Any version before 3.22.0
affected

3.22.0 (semver)
unaffected

Credits

jeremylaratro reporter

References

github.com/...reeRDP/security/advisories/GHSA-3mv2-5q57-2v8h exploit

github.com/...reeRDP/security/advisories/GHSA-3mv2-5q57-2v8h (GitHub Security Advisory (GHSA-3mv2-5q57-2v8h)) vendor-advisory

www.vulncheck.com/...e-condition-in-drdynvc-channel-callback (VulnCheck Advisory: FreeRDP - Use-After-Free via Race Condition in DRDYNVC Channel Callback) third-party-advisory

cve.org (CVE-2026-56297)

nvd.nist.gov (CVE-2026-56297)

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