What is CVE-2026-91947?

CVE-2026-91947 is a high-severity vulnerability in Freerdp, classified under Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition). CVSS score: 7.5/10. Published 2026-09-15.

How severe is CVE-2026-91947?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Freerdp

CVE-2026-91947

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.

Vulnerability class: Race Condition

Published 2026-09-15 · last modified 2026-09-24.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.003 (23.6th percentile), scored 2026-10-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 24th percentile — 23.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000

Affected products

Freerdp

Weakness classification (CWE)

CWE-362 — Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition)

References

github.com/FreeRDP/FreeRDP/security/advisories/GHSA-6mpx-c8rj-whj5 (vendor-advisory)
www.vulncheck.com/advisories/freerdp-server-before-3.31.0-use-after-free-via-dr… (third-party-advisory)

Frequently asked questions

What is CVE-2026-91947?: CVE-2026-91947 is a high-severity vulnerability in Freerdp, classified under Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition). CVSS score: 7.5/10. Published 2026-09-15.
How severe is CVE-2026-91947?: High severity. CVSS v3 base score is 7.5 out of 10.