CVE-2026-91947
FreeRDP Server before 3.31.0 Use-After-Free via DRDYNVC
- State
- Published
- Severity
- 7.7 High
- Published
- Sep 15, 2026
- Updated
- Sep 16, 2026
- Reserved
- Sep 15, 2026
Description
FreeRDP server versions before 3.31.0 contain a use-after-free vulnerability in the DRDYNVC parser that dereferences a channel pointer after releasing the synchronization lock. Authenticated clients can race AUDIN channel closure messages against DRDYNVC data parsing to trigger heap-use-after-free when accessing freed channel objects.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 7.7 High | CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 7.5 High | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/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-6mpx-c8rj-whj5)vendor-advisory
- VulnCheck Advisory: FreeRDP Server before 3.31.0 Use-After-Free via DRDYNVCthird-party-advisory
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