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Vulnerability · Published May 29, 2026 · Assigned by GitHub_M

CVE-2026-44422FreeRDP RDPEAR NDR ref-id aliasing causes client-side UAF/double-free and type confusion

High 7.5

In plain English

A high-severity use-after-free in FreeRDP from FreeRDP. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 37% 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 62.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official description

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.26.0, FreeRDP's RDPEAR NDR parser accepts one non-null NDR pointer ref-id for multiple logical pointer fields without tracking the pointed object's expected NDR type or ownership. When the same ref-id is reused across two pointer fields, the parser assigns the same heap object to both output fields. The generic destructor later walks each field independently and destroys/frees both pointers. This causes a malicious-server-triggerable heap use-after-free / double-free in the FreeRDP client's RDPEAR authentication-redirection path. This vulnerability is fixed in 3.26.0.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
AlmaLinux:10freerdp2:3.10.3-12.el10_2.6ALSA-2026:36203
AlmaLinux:10freerdp-devel2:3.10.3-12.el10_2.6ALSA-2026:36203
AlmaLinux:10freerdp-libs2:3.10.3-12.el10_2.6ALSA-2026:36203
AlmaLinux:10freerdp-server2:3.10.3-12.el10_2.6ALSA-2026:36203
AlmaLinux:10libwinpr2:3.10.3-12.el10_2.6ALSA-2026:36203
AlmaLinux:10libwinpr-devel2:3.10.3-12.el10_2.6ALSA-2026:36203
Debian:12freerdp2no fix listedDEBIAN-CVE-2026-44422
Debian:13freerdp3no fix listedDEBIAN-CVE-2026-44422
Debian:14freerdp33.26.0+dfsg-1DEBIAN-CVE-2026-44422
Rocky Linux:10freerdp2:3.10.3-12.el10_2.6RLSA-2026:36203
Ubuntu:22.04:LTSfreerdp2no fix listedUBUNTU-CVE-2026-44422
Ubuntu:24.04:LTSfreerdp33.30.0+dfsg-0ubuntu0.24.04.1UBUNTU-CVE-2026-44422
Ubuntu:24.04:LTSfreerdp33.30.0+dfsg-0ubuntu0.24.04.1USN-8561-1
Ubuntu:25.10freerdp3no fix listedUBUNTU-CVE-2026-44422
Ubuntu:26.04:LTSfreerdp33.30.0+dfsg-0ubuntu0.26.04.1UBUNTU-CVE-2026-44422
Ubuntu:26.04:LTSfreerdp33.30.0+dfsg-0ubuntu0.26.04.1USN-8561-1

Affected products (as reported)

VendorProductVersions
FreeRDP FreeRDP < 3.26.0

Weakness: CWE-416, CWE-415, CWE-825 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

References