CVE-2026-56297
FreeRDP - Use-After-Free via Race Condition in DRDYNVC Channel Callback
- State
- Published
- Severity
- 8.3 High
- Published
- Jul 8, 2026
- Updated
- Jul 8, 2026
- Reserved
- Jun 20, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 8.3 High | 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 | VulnCheck |
| 3.1 | 7.0 High | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H | VulnCheck |
Weaknesses
- CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
Affected Products
| Product | Versions |
|---|---|
FreeRDPFreeRDP |
|
References
- GitHub Security Advisory (GHSA-3mv2-5q57-2v8h)vendor-advisory
- VulnCheck Advisory: FreeRDP - Use-After-Free via Race Condition in DRDYNVC Channel Callbackthird-party-advisory
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