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Vulnerability · Published Jan 14, 2026 · Assigned by GitHub_M

CVE-2026-22856FreeRDP has a heap-use-after-free in create_irp_thread

Medium 6.8

In plain English

A medium-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 0.3% (higher than 26% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)6.8Medium
Exploit odds (30 days)0.3%top 73.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.20.1, a race in the serial channel IRP thread tracking allows a heap use‑after‑free when one thread removes an entry from serial->IrpThreads while another reads it. This vulnerability is fixed in 3.20.1.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
AlmaLinux:10freerdp2:3.10.3-5.el10_1.5ALSA-2026:6799
AlmaLinux:8freerdp2:2.11.7-6.el8_10ALSA-2026:6918
AlmaLinux:9freerdp2:2.11.7-1.el9_7.5ALSA-2026:6340
AlmaLinux:10freerdp-devel2:3.10.3-5.el10_1.5ALSA-2026:6799
AlmaLinux:8freerdp-devel2:2.11.7-6.el8_10ALSA-2026:6918
AlmaLinux:9freerdp-devel2:2.11.7-1.el9_7.5ALSA-2026:6340
AlmaLinux:10freerdp-libs2:3.10.3-5.el10_1.5ALSA-2026:6799
AlmaLinux:8freerdp-libs2:2.11.7-6.el8_10ALSA-2026:6918
AlmaLinux:9freerdp-libs2:2.11.7-1.el9_7.5ALSA-2026:6340
AlmaLinux:10freerdp-server2:3.10.3-5.el10_1.5ALSA-2026:6799
AlmaLinux:10libwinpr2:3.10.3-5.el10_1.5ALSA-2026:6799
AlmaLinux:8libwinpr2:2.11.7-6.el8_10ALSA-2026:6918
AlmaLinux:9libwinpr2:2.11.7-1.el9_7.5ALSA-2026:6340
AlmaLinux:10libwinpr-devel2:3.10.3-5.el10_1.5ALSA-2026:6799
AlmaLinux:8libwinpr-devel2:2.11.7-6.el8_10ALSA-2026:6918
AlmaLinux:9libwinpr-devel2:2.11.7-1.el9_7.5ALSA-2026:6340
Alpine:v3.23freerdp3.22.0-r0ALPINE-CVE-2026-22856
Debian:12freerdp2no fix listedDEBIAN-CVE-2026-22856
Debian:13freerdp33.15.0+dfsg-2.1+deb13u1DEBIAN-CVE-2026-22856
Debian:14freerdp33.20.2+dfsg-1DEBIAN-CVE-2026-22856
Rocky Linux:10freerdp2:3.10.3-5.el10_1.5RLSA-2026:6799
Rocky Linux:8freerdp2:2.11.7-6.el8_10RLSA-2026:6918
Rocky Linux:9freerdp2:2.11.7-1.el9_7.5RLSA-2026:6340
Ubuntu:22.04:LTSfreerdp2no fix listedUBUNTU-CVE-2026-22856
Ubuntu:24.04:LTSfreerdp33.5.1+dfsg1-0ubuntu1.4USN-8105-1
Ubuntu:24.04:LTSfreerdp33.5.1+dfsg1-0ubuntu1.4UBUNTU-CVE-2026-22856
Ubuntu:25.10freerdp33.16.0+dfsg-2ubuntu0.3USN-8105-1
Ubuntu:25.10freerdp33.16.0+dfsg-2ubuntu0.3UBUNTU-CVE-2026-22856
Ubuntu:26.04:LTSfreerdp33.20.2+dfsg-1UBUNTU-CVE-2026-22856

Affected products (as reported)

VendorProductVersions
FreeRDP FreeRDP < 3.20.1

Weakness: CWE-362, CWE-416 · Vector: CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P

References