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Vulnerability · Published Sep 15, 2026 · Assigned by VulnCheck

CVE-2026-91947FreeRDP Server before 3.31.0 Use-After-Free via DRDYNVC

High 7.5

In plain English

A high-severity race condition in FreeRDP from FreeRDP. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 32% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.4%top 68.4% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
AlmaLinux:10freerdp2:3.10.3-12.el10_2.14ALSA-2026:75570
AlmaLinux:10freerdp-devel2:3.10.3-12.el10_2.14ALSA-2026:75570
AlmaLinux:10freerdp-libs2:3.10.3-12.el10_2.14ALSA-2026:75570
AlmaLinux:10freerdp-server2:3.10.3-12.el10_2.14ALSA-2026:75570
AlmaLinux:10libwinpr2:3.10.3-12.el10_2.14ALSA-2026:75570
AlmaLinux:10libwinpr-devel2:3.10.3-12.el10_2.14ALSA-2026:75570
Debian:12freerdp2no fix listedDEBIAN-CVE-2026-91947
Debian:13freerdp3no fix listedDEBIAN-CVE-2026-91947
Debian:14freerdp33.31.0+dfsg-1DEBIAN-CVE-2026-91947
Rocky Linux:10freerdp2:3.10.3-12.el10_2.14RLSA-2026:75570
Ubuntu:22.04:LTSfreerdp2no fix listedUBUNTU-CVE-2026-91947
Ubuntu:24.04:LTSfreerdp33.31.0+dfsg-0ubuntu0.24.04.1UBUNTU-CVE-2026-91947
Ubuntu:26.04:LTSfreerdp33.31.0+dfsg-0ubuntu0.26.04.1UBUNTU-CVE-2026-91947

Affected products (as reported)

VendorProductVersions
FreeRDP FreeRDP 2.0.0 – before 3.31.0

Weakness: CWE-362 · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

References