CVE-2026-56297 Details
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.
A use-after-free vulnerability has been identified in FreeRDP versions prior to 3.22.0. This vulnerability arises from improper synchronization of channel callback access in the DRDYNVC client. A malicious RDP server can exploit this issue by sending DYNVC_DATA and DYNVC_CLOSE messages simultaneously, creating a race condition. This leads to a heap-use-after-free situation in the DRDYNVC client thread, which could potentially allow for remote code execution or cause a denial-of-service condition.
Users can upgrade to FreeRDP version 3.22.0 or later, where this vulnerability has been fixed.
Metrics
CVSS 4.0 Severity and Vector Strings:
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Jul 8, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-3mv2-5q57-2v8h | CISA-ADP | ExploitVendor Advisory |
| https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-3mv2-5q57-2v8h | [email protected] | ExploitVendor Advisory |
| https://www.vulncheck.com/advisories/freerdp-use-after-free-via-race-condition-in-drdynvc-channel-callback | [email protected] | Third Party Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-362 | Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| freerdp freerdp | < 3.22.0 |
CPE
Remediation
| |
Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 10, 2026 | Initial Analysis | [email protected] |
| Jul 8, 2026 | CVE Modified | CISA-ADP |
| Jul 8, 2026 | New CVE Received | [email protected] |