# CVE-2026-44421: freerdp3-shadow-x11: FreeRDP is a free implementation of the Remote Desktop Protocol

CVE-2026-44421 is fixed in 34 products on 1 platform, first by RHSA-2026:46393, released May 29, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-44421
- Priority: High
- CVSS: 8.8 (Medium)
- EPSS: 0.0051
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 29, 2026

## Description

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.26.0, a malicious RDP server can trigger a heap-buffer-overflow write in the FreeRDP client by sending crafted RDPGFX PDUs. The bug is in gdi_CacheToSurface: it validates a destination rectangle that is clamped to UINT16_MAX, but then performs the copy using the original cacheEntry->width/height. This can cause a large out-of-bounds heap write and may lead to client crashes or code execution. This bug is reachable from a malicious RDP server, but only when the client has RDPGFX enabled. This vulnerability is fixed in 3.26.0.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | freerdp RHEL 10 | 3.10.3-3.el10_0.9 | [RHSA-2026:46393](https://patchblox.com/security/data/fix/linux/rhsa-2026-46393.md) | May 29, 2026 |
| Linux | freerdp almalinux 10 | 2:3.10.3-12.el10_2.6 | [ALSA-2026:36203](https://patchblox.com/security/data/fix/linux/alsa-2026-36203.md) | Jul 7, 2026 |
| Linux | freerdp amzn 2023 | 2:3.6.3-1.amzn2023.0.12 | [ALAS2023-2026-1822](https://patchblox.com/security/data/fix/linux/alas2023-2026-1822.md) | Jun 8, 2026 |
| Linux | freerdp ol 10 | 2:3.10.3-12.el10_2.6 | [ELSA-2026-36203](https://patchblox.com/security/data/fix/linux/elsa-2026-36203.md) | Jul 16, 2026 |
| Linux | freerdp opensuse-leap 16.0 | 3.26.0-160000.1.1 | [OPENSUSE-SU-2026:21116-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21116-1.md) | Jun 20, 2026 |
| Linux | freerdp rocky 10 | 2:3.10.3-12.el10_2.6 | [RLSA-2026:36203](https://patchblox.com/security/data/fix/linux/rlsa-2026-36203.md) | Jul 8, 2026 |
| Linux | freerdp sles 15.7 | 3.10.3-150700.3.17.1 | [SUSE-SU-2026:3562-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3562-1.md) | Aug 10, 2026 |
| Linux | freerdp sles 16.0 | 3.26.0-160000.1.1 | [SUSE-SU-2026:22194-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-22194-1.md) | Jun 20, 2026 |
| Linux | freerdp-debuginfo amzn 2023 | 2:3.6.3-1.amzn2023.0.12 | [ALAS2023-2026-1822](https://patchblox.com/security/data/fix/linux/alas2023-2026-1822.md) | Jun 8, 2026 |
| Linux | freerdp-debugsource amzn 2023 | 2:3.6.3-1.amzn2023.0.12 | [ALAS2023-2026-1822](https://patchblox.com/security/data/fix/linux/alas2023-2026-1822.md) | Jun 8, 2026 |
| Linux | freerdp-devel almalinux 10 | 2:3.10.3-12.el10_2.6 | [ALSA-2026:36203](https://patchblox.com/security/data/fix/linux/alsa-2026-36203.md) | Jul 7, 2026 |
| Linux | freerdp-devel amzn 2023 | 2:3.6.3-1.amzn2023.0.12 | [ALAS2023-2026-1822](https://patchblox.com/security/data/fix/linux/alas2023-2026-1822.md) | Jun 8, 2026 |
| Linux | freerdp-devel ol 10 | 2:3.10.3-12.el10_2.6 | [ELSA-2026-36203](https://patchblox.com/security/data/fix/linux/elsa-2026-36203.md) | Jul 16, 2026 |
| Linux | freerdp-libs almalinux 10 | 2:3.10.3-12.el10_2.6 | [ALSA-2026:36203](https://patchblox.com/security/data/fix/linux/alsa-2026-36203.md) | Jul 7, 2026 |
| Linux | freerdp-libs amzn 2023 | 2:3.6.3-1.amzn2023.0.12 | [ALAS2023-2026-1822](https://patchblox.com/security/data/fix/linux/alas2023-2026-1822.md) | Jun 8, 2026 |
| Linux | freerdp-libs ol 10 | 2:3.10.3-12.el10_2.6 | [ELSA-2026-36203](https://patchblox.com/security/data/fix/linux/elsa-2026-36203.md) | Jul 16, 2026 |
| Linux | freerdp-libs-debuginfo amzn 2023 | 2:3.6.3-1.amzn2023.0.12 | [ALAS2023-2026-1822](https://patchblox.com/security/data/fix/linux/alas2023-2026-1822.md) | Jun 8, 2026 |
| Linux | freerdp-proxy Ubuntu 26.04.1 LTS (resolute) | 3.30.0+dfsg-0ubuntu0.26.04.1 | [freerdp-proxy 3.30.0+dfsg-0ubuntu0.26.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-freerdp-proxy-3.30.0-dfsg-0ubuntu0.26.04.1.md) | Nov 7, 2026 |
| Linux | freerdp-proxy-modules Ubuntu 26.04.1 LTS (resolute) | 3.30.0+dfsg-0ubuntu0.26.04.1 | [freerdp-proxy-modules 3.30.0+dfsg-0ubuntu0.26.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-freerdp-proxy-modules-3.30.0-dfsg-0ubuntu0.26.04.1.md) | Nov 7, 2026 |
| Linux | freerdp-sdl Ubuntu 26.04.1 LTS (resolute) | 3.30.0+dfsg-0ubuntu0.26.04.1 | [freerdp-sdl 3.30.0+dfsg-0ubuntu0.26.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-freerdp-sdl-3.30.0-dfsg-0ubuntu0.26.04.1.md) | Nov 7, 2026 |
| Linux | freerdp-server almalinux 10 | 2:3.10.3-12.el10_2.6 | [ALSA-2026:36203](https://patchblox.com/security/data/fix/linux/alsa-2026-36203.md) | Jul 7, 2026 |
| Linux | freerdp-server amzn 2023 | 2:3.6.3-1.amzn2023.0.12 | [ALAS2023-2026-1822](https://patchblox.com/security/data/fix/linux/alas2023-2026-1822.md) | Jun 8, 2026 |
| Linux | freerdp-server ol 10 | 2:3.10.3-12.el10_2.6 | [ELSA-2026-36203](https://patchblox.com/security/data/fix/linux/elsa-2026-36203.md) | Jul 16, 2026 |
| Linux | freerdp-server-debuginfo amzn 2023 | 2:3.6.3-1.amzn2023.0.12 | [ALAS2023-2026-1822](https://patchblox.com/security/data/fix/linux/alas2023-2026-1822.md) | Jun 8, 2026 |
| Linux | freerdp-shadow-x11 Ubuntu 26.04.1 LTS (resolute) | 3.30.0+dfsg-0ubuntu0.26.04.1 | [freerdp-shadow-x11 3.30.0+dfsg-0ubuntu0.26.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-freerdp-shadow-x11-3.30.0-dfsg-0ubuntu0.26.04.1.md) | Nov 7, 2026 |
| Linux | freerdp-wayland Ubuntu 26.04.1 LTS (resolute) | 3.30.0+dfsg-0ubuntu0.26.04.1 | [freerdp-wayland 3.30.0+dfsg-0ubuntu0.26.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-freerdp-wayland-3.30.0-dfsg-0ubuntu0.26.04.1.md) | Nov 7, 2026 |
| Linux | freerdp-x11 Ubuntu 26.04.1 LTS (resolute) | 3.30.0+dfsg-0ubuntu0.26.04.1 | [freerdp-x11 3.30.0+dfsg-0ubuntu0.26.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-freerdp-x11-3.30.0-dfsg-0ubuntu0.26.04.1.md) | Nov 7, 2026 |
| Linux | freerdp3 Debian 14 | 3.26.0+dfsg-1 | [DEBIAN-CVE-2026-44421](https://patchblox.com/security/data/fix/linux/debian-cve-2026-44421.md) | Jun 24, 2026 |
| Linux | freerdp3-proxy Ubuntu 26.04.1 LTS (resolute) | 3.30.0+dfsg-0ubuntu0.26.04.1 | [freerdp3-proxy 3.30.0+dfsg-0ubuntu0.26.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-freerdp3-proxy-3.30.0-dfsg-0ubuntu0.26.04.1.md) | Nov 7, 2026 |
| Linux | freerdp3-proxy-modules Ubuntu 26.04.1 LTS (resolute) | 3.30.0+dfsg-0ubuntu0.26.04.1 | [freerdp3-proxy-modules 3.30.0+dfsg-0ubuntu0.26.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-freerdp3-proxy-modules-3.30.0-dfsg-0ubuntu0.26.04.1.md) | Nov 7, 2026 |
| Linux | freerdp3-sdl Ubuntu 26.04.1 LTS (resolute) | 3.30.0+dfsg-0ubuntu0.26.04.1 | [freerdp3-sdl 3.30.0+dfsg-0ubuntu0.26.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-freerdp3-sdl-3.30.0-dfsg-0ubuntu0.26.04.1.md) | Nov 7, 2026 |
| Linux | freerdp3-shadow-x11 Ubuntu 24.04.5 LTS (noble) | 3.30.0+dfsg-0ubuntu0.24.04.1 | [freerdp3-shadow-x11 3.30.0+dfsg-0ubuntu0.24.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-freerdp3-shadow-x11-3.30.0-dfsg-0ubuntu0.24.04.1.md) | Jul 23, 2026 |
| Linux | freerdp3-shadow-x11 Ubuntu 26.04.1 LTS (resolute) | 3.30.0+dfsg-0ubuntu0.26.04.1 | [freerdp3-shadow-x11 3.30.0+dfsg-0ubuntu0.26.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-freerdp3-shadow-x11-3.30.0-dfsg-0ubuntu0.26.04.1.md) | Nov 7, 2026 |
| Linux | freerdp3-wayland Ubuntu 24.04.5 LTS (noble) | 3.30.0+dfsg-0ubuntu0.24.04.1 | [freerdp3-wayland 3.30.0+dfsg-0ubuntu0.24.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-freerdp3-wayland-3.30.0-dfsg-0ubuntu0.24.04.1.md) | Jul 23, 2026 |
| Linux | freerdp3-wayland Ubuntu 26.04.1 LTS (resolute) | 3.30.0+dfsg-0ubuntu0.26.04.1 | [freerdp3-wayland 3.30.0+dfsg-0ubuntu0.26.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-freerdp3-wayland-3.30.0-dfsg-0ubuntu0.26.04.1.md) | Nov 7, 2026 |
| Linux | freerdp3-x11 Ubuntu 24.04.5 LTS (noble) | 3.30.0+dfsg-0ubuntu0.24.04.1 | [freerdp3-x11 3.30.0+dfsg-0ubuntu0.24.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-freerdp3-x11-3.30.0-dfsg-0ubuntu0.24.04.1.md) | Jul 23, 2026 |
| Linux | freerdp3-x11 Ubuntu 26.04.1 LTS (resolute) | 3.30.0+dfsg-0ubuntu0.26.04.1 | [freerdp3-x11 3.30.0+dfsg-0ubuntu0.26.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-freerdp3-x11-3.30.0-dfsg-0ubuntu0.26.04.1.md) | Nov 7, 2026 |
| Linux | libfreerdp-client3-3 Ubuntu 24.04.5 LTS (noble) | 3.30.0+dfsg-0ubuntu0.24.04.1 | [libfreerdp-client3-3 3.30.0+dfsg-0ubuntu0.24.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libfreerdp-client3-3-3.30.0-dfsg-0ubuntu0.24.04.1.md) | Jul 23, 2026 |
| Linux | libfreerdp-client3-3 Ubuntu 26.04.1 LTS (resolute) | 3.30.0+dfsg-0ubuntu0.26.04.1 | [libfreerdp-client3-3 3.30.0+dfsg-0ubuntu0.26.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libfreerdp-client3-3-3.30.0-dfsg-0ubuntu0.26.04.1.md) | Nov 7, 2026 |
| Linux | libfreerdp-server-proxy3-3 Ubuntu 26.04.1 LTS (resolute) | 3.30.0+dfsg-0ubuntu0.26.04.1 | [libfreerdp-server-proxy3-3 3.30.0+dfsg-0ubuntu0.26.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libfreerdp-server-proxy3-3-3.30.0-dfsg-0ubuntu0.26.04.1.md) | Nov 7, 2026 |
| Linux | libfreerdp-server3-3 Ubuntu 24.04.5 LTS (noble) | 3.30.0+dfsg-0ubuntu0.24.04.1 | [libfreerdp-server3-3 3.30.0+dfsg-0ubuntu0.24.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libfreerdp-server3-3-3.30.0-dfsg-0ubuntu0.24.04.1.md) | Jul 23, 2026 |
| Linux | libfreerdp-server3-3 Ubuntu 26.04.1 LTS (resolute) | 3.30.0+dfsg-0ubuntu0.26.04.1 | [libfreerdp-server3-3 3.30.0+dfsg-0ubuntu0.26.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libfreerdp-server3-3-3.30.0-dfsg-0ubuntu0.26.04.1.md) | Nov 7, 2026 |
| Linux | libfreerdp-shadow-subsystem3-3 Ubuntu 24.04.5 LTS (noble) | 3.30.0+dfsg-0ubuntu0.24.04.1 | [libfreerdp-shadow-subsystem3-3 3.30.0+dfsg-0ubuntu0.24.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libfreerdp-shadow-subsystem3-3-3.30.0-dfsg-0ubuntu0.24.04.1.md) | Jul 23, 2026 |
| Linux | libfreerdp-shadow-subsystem3-3 Ubuntu 26.04.1 LTS (resolute) | 3.30.0+dfsg-0ubuntu0.26.04.1 | [libfreerdp-shadow-subsystem3-3 3.30.0+dfsg-0ubuntu0.26.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libfreerdp-shadow-subsystem3-3-3.30.0-dfsg-0ubuntu0.26.04.1.md) | Nov 7, 2026 |
| Linux | libfreerdp-shadow3-3 Ubuntu 24.04.5 LTS (noble) | 3.30.0+dfsg-0ubuntu0.24.04.1 | [libfreerdp-shadow3-3 3.30.0+dfsg-0ubuntu0.24.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libfreerdp-shadow3-3-3.30.0-dfsg-0ubuntu0.24.04.1.md) | Jul 23, 2026 |
| Linux | libfreerdp-shadow3-3 Ubuntu 26.04.1 LTS (resolute) | 3.30.0+dfsg-0ubuntu0.26.04.1 | [libfreerdp-shadow3-3 3.30.0+dfsg-0ubuntu0.26.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libfreerdp-shadow3-3-3.30.0-dfsg-0ubuntu0.26.04.1.md) | Nov 7, 2026 |
| Linux | libfreerdp3-3 Ubuntu 24.04.5 LTS (noble) | 3.30.0+dfsg-0ubuntu0.24.04.1 | [libfreerdp3-3 3.30.0+dfsg-0ubuntu0.24.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libfreerdp3-3-3.30.0-dfsg-0ubuntu0.24.04.1.md) | Jul 23, 2026 |
| Linux | libfreerdp3-3 Ubuntu 26.04.1 LTS (resolute) | 3.30.0+dfsg-0ubuntu0.26.04.1 | [libfreerdp3-3 3.30.0+dfsg-0ubuntu0.26.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libfreerdp3-3-3.30.0-dfsg-0ubuntu0.26.04.1.md) | Nov 7, 2026 |
| Linux | libwinpr almalinux 10 | 2:3.10.3-12.el10_2.6 | [ALSA-2026:36203](https://patchblox.com/security/data/fix/linux/alsa-2026-36203.md) | Jul 7, 2026 |
| Linux | libwinpr amzn 2023 | 2:3.6.3-1.amzn2023.0.12 | [ALAS2023-2026-1822](https://patchblox.com/security/data/fix/linux/alas2023-2026-1822.md) | Jun 8, 2026 |
| Linux | libwinpr ol 10 | 2:3.10.3-12.el10_2.6 | [ELSA-2026-36203](https://patchblox.com/security/data/fix/linux/elsa-2026-36203.md) | Jul 16, 2026 |
| Linux | libwinpr-debuginfo amzn 2023 | 2:3.6.3-1.amzn2023.0.12 | [ALAS2023-2026-1822](https://patchblox.com/security/data/fix/linux/alas2023-2026-1822.md) | Jun 8, 2026 |
| Linux | libwinpr-devel almalinux 10 | 2:3.10.3-12.el10_2.6 | [ALSA-2026:36203](https://patchblox.com/security/data/fix/linux/alsa-2026-36203.md) | Jul 7, 2026 |
| Linux | libwinpr-devel amzn 2023 | 2:3.6.3-1.amzn2023.0.12 | [ALAS2023-2026-1822](https://patchblox.com/security/data/fix/linux/alas2023-2026-1822.md) | Jun 8, 2026 |
| Linux | libwinpr-devel ol 10 | 2:3.10.3-12.el10_2.6 | [ELSA-2026-36203](https://patchblox.com/security/data/fix/linux/elsa-2026-36203.md) | Jul 16, 2026 |
| Linux | libwinpr-tools3-3 Ubuntu 24.04.5 LTS (noble) | 3.30.0+dfsg-0ubuntu0.24.04.1 | [libwinpr-tools3-3 3.30.0+dfsg-0ubuntu0.24.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libwinpr-tools3-3-3.30.0-dfsg-0ubuntu0.24.04.1.md) | Jul 23, 2026 |
| Linux | libwinpr-tools3-3 Ubuntu 26.04.1 LTS (resolute) | 3.30.0+dfsg-0ubuntu0.26.04.1 | [libwinpr-tools3-3 3.30.0+dfsg-0ubuntu0.26.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libwinpr-tools3-3-3.30.0-dfsg-0ubuntu0.26.04.1.md) | Nov 7, 2026 |
| Linux | libwinpr3-3 Ubuntu 24.04.5 LTS (noble) | 3.30.0+dfsg-0ubuntu0.24.04.1 | [libwinpr3-3 3.30.0+dfsg-0ubuntu0.24.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libwinpr3-3-3.30.0-dfsg-0ubuntu0.24.04.1.md) | Jul 23, 2026 |
| Linux | libwinpr3-3 Ubuntu 26.04.1 LTS (resolute) | 3.30.0+dfsg-0ubuntu0.26.04.1 | [libwinpr3-3 3.30.0+dfsg-0ubuntu0.26.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libwinpr3-3-3.30.0-dfsg-0ubuntu0.26.04.1.md) | Nov 7, 2026 |
| Linux | winpr-utils Ubuntu 26.04.1 LTS (resolute) | 3.30.0+dfsg-0ubuntu0.26.04.1 | [winpr-utils 3.30.0+dfsg-0ubuntu0.26.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-winpr-utils-3.30.0-dfsg-0ubuntu0.26.04.1.md) | Nov 7, 2026 |
| Linux | winpr3-utils Ubuntu 24.04.5 LTS (noble) | 3.30.0+dfsg-0ubuntu0.24.04.1 | [winpr3-utils 3.30.0+dfsg-0ubuntu0.24.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-winpr3-utils-3.30.0-dfsg-0ubuntu0.24.04.1.md) | Jul 23, 2026 |
| Linux | winpr3-utils Ubuntu 26.04.1 LTS (resolute) | 3.30.0+dfsg-0ubuntu0.26.04.1 | [winpr3-utils 3.30.0+dfsg-0ubuntu0.26.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-winpr3-utils-3.30.0-dfsg-0ubuntu0.26.04.1.md) | Nov 7, 2026 |

---

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