# CVE-2026-27951: freerdp3-shadow-x11: FreeRDP is a free implementation of the Remote Desktop Protocol

CVE-2026-27951 is fixed in 23 products on 1 platform, first by DEBIAN-CVE-2026-27951, released February 25, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-27951
- Priority: High
- CVSS: 7.5 (Medium)
- EPSS: 0.0041
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Feb 25, 2026

## Description

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.23.0, the function `Stream_EnsureCapacity` can create an endless blocking loop. This may affect all client and server implementations using `FreeRDP`. For practical exploitation this will only work on 32bit systems where the available physical memory is `>= SIZE_MAX`. Version 3.23.0 contains a patch. No known workarounds are available.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | freerdp RHEL 8 | 2:2.11.7-9.el8_10 | [RHSA-2026:16019](https://patchblox.com/security/data/fix/linux/rhsa-2026-16019.md) | May 15, 2026 |
| Linux | freerdp RHEL 9 | 2:2.11.7-7.el9_8.3 | [RHSA-2026:19358](https://patchblox.com/security/data/fix/linux/rhsa-2026-19358.md) | May 15, 2026 |
| Linux | freerdp almalinux 8 | 2:2.11.7-9.el8_10 | [ALSA-2026:16019](https://patchblox.com/security/data/fix/linux/alsa-2026-16019.md) | May 11, 2026 |
| Linux | freerdp almalinux 9 | 2:2.11.7-7.el9_8.3 | [ALSA-2026:19358](https://patchblox.com/security/data/fix/linux/alsa-2026-19358.md) | May 19, 2026 |
| Linux | freerdp amzn 2023 | 2:3.6.3-1.amzn2023.0.7 | [ALAS2023-2026-1512](https://patchblox.com/security/data/fix/linux/alas2023-2026-1512.md) | Mar 30, 2026 |
| Linux | freerdp ol 8 | 2:2.11.7-9.el8_10 | [ELSA-2026-16019](https://patchblox.com/security/data/fix/linux/elsa-2026-16019.md) | May 11, 2026 |
| Linux | freerdp ol 9 | 2:2.11.7-1.el9_7.7 | [ELSA-2026-16482](https://patchblox.com/security/data/fix/linux/elsa-2026-16482.md) | May 12, 2026 |
| Linux | freerdp rocky 8 | 2:2.11.7-9.el8_10 | [RLSA-2026:16019](https://patchblox.com/security/data/fix/linux/rlsa-2026-16019.md) | May 13, 2026 |
| Linux | freerdp rocky 9 | 2:2.11.7-7.el9_8.3 | [RLSA-2026:19358](https://patchblox.com/security/data/fix/linux/rlsa-2026-19358.md) | May 28, 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-debuginfo amzn 2023 | 2:3.6.3-1.amzn2023.0.7 | [ALAS2023-2026-1512](https://patchblox.com/security/data/fix/linux/alas2023-2026-1512.md) | Mar 30, 2026 |
| Linux | freerdp-debugsource amzn 2023 | 2:3.6.3-1.amzn2023.0.7 | [ALAS2023-2026-1512](https://patchblox.com/security/data/fix/linux/alas2023-2026-1512.md) | Mar 30, 2026 |
| Linux | freerdp-devel RHEL 8 | 2:2.11.7-9.el8_10 | [RHSA-2026:16019](https://patchblox.com/security/data/fix/linux/rhsa-2026-16019.md) | May 15, 2026 |
| Linux | freerdp-devel RHEL 9 | 2:2.11.7-7.el9_8.3 | [RHSA-2026:19358](https://patchblox.com/security/data/fix/linux/rhsa-2026-19358.md) | May 15, 2026 |
| Linux | freerdp-devel almalinux 8 | 2:2.11.7-9.el8_10 | [ALSA-2026:16019](https://patchblox.com/security/data/fix/linux/alsa-2026-16019.md) | May 11, 2026 |
| Linux | freerdp-devel almalinux 9 | 2:2.11.7-7.el9_8.3 | [ALSA-2026:19358](https://patchblox.com/security/data/fix/linux/alsa-2026-19358.md) | May 19, 2026 |
| Linux | freerdp-devel amzn 2023 | 2:3.6.3-1.amzn2023.0.7 | [ALAS2023-2026-1512](https://patchblox.com/security/data/fix/linux/alas2023-2026-1512.md) | Mar 30, 2026 |
| Linux | freerdp-devel ol 8 | 2:2.11.7-9.el8_10 | [ELSA-2026-16019](https://patchblox.com/security/data/fix/linux/elsa-2026-16019.md) | May 11, 2026 |
| Linux | freerdp-devel ol 9 | 2:2.11.7-1.el9_7.7 | [ELSA-2026-16482](https://patchblox.com/security/data/fix/linux/elsa-2026-16482.md) | May 12, 2026 |
| Linux | freerdp-libs RHEL 8 | 2:2.11.7-9.el8_10 | [RHSA-2026:16019](https://patchblox.com/security/data/fix/linux/rhsa-2026-16019.md) | May 15, 2026 |
| Linux | freerdp-libs RHEL 9 | 2:2.11.7-7.el9_8.3 | [RHSA-2026:19358](https://patchblox.com/security/data/fix/linux/rhsa-2026-19358.md) | May 15, 2026 |
| Linux | freerdp-libs almalinux 8 | 2:2.11.7-9.el8_10 | [ALSA-2026:16019](https://patchblox.com/security/data/fix/linux/alsa-2026-16019.md) | May 11, 2026 |
| Linux | freerdp-libs almalinux 9 | 2:2.11.7-7.el9_8.3 | [ALSA-2026:19358](https://patchblox.com/security/data/fix/linux/alsa-2026-19358.md) | May 19, 2026 |
| Linux | freerdp-libs amzn 2023 | 2:3.6.3-1.amzn2023.0.7 | [ALAS2023-2026-1512](https://patchblox.com/security/data/fix/linux/alas2023-2026-1512.md) | Mar 30, 2026 |
| Linux | freerdp-libs ol 8 | 2:2.11.7-9.el8_10 | [ELSA-2026-16019](https://patchblox.com/security/data/fix/linux/elsa-2026-16019.md) | May 11, 2026 |
| Linux | freerdp-libs ol 9 | 2:2.11.7-1.el9_7.7 | [ELSA-2026-16482](https://patchblox.com/security/data/fix/linux/elsa-2026-16482.md) | May 12, 2026 |
| Linux | freerdp-libs-debuginfo amzn 2023 | 2:3.6.3-1.amzn2023.0.7 | [ALAS2023-2026-1512](https://patchblox.com/security/data/fix/linux/alas2023-2026-1512.md) | Mar 30, 2026 |
| Linux | freerdp-server amzn 2023 | 2:3.6.3-1.amzn2023.0.7 | [ALAS2023-2026-1512](https://patchblox.com/security/data/fix/linux/alas2023-2026-1512.md) | Mar 30, 2026 |
| Linux | freerdp-server-debuginfo amzn 2023 | 2:3.6.3-1.amzn2023.0.7 | [ALAS2023-2026-1512](https://patchblox.com/security/data/fix/linux/alas2023-2026-1512.md) | Mar 30, 2026 |
| Linux | freerdp3 Debian 14 | 3.23.0+dfsg-1 | [DEBIAN-CVE-2026-27951](https://patchblox.com/security/data/fix/linux/debian-cve-2026-27951.md) | Feb 25, 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-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-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 | 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-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-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-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 | 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 | libwinpr RHEL 8 | 2:2.11.7-9.el8_10 | [RHSA-2026:16019](https://patchblox.com/security/data/fix/linux/rhsa-2026-16019.md) | May 15, 2026 |
| Linux | libwinpr RHEL 9 | 2:2.11.7-7.el9_8.3 | [RHSA-2026:19358](https://patchblox.com/security/data/fix/linux/rhsa-2026-19358.md) | May 15, 2026 |
| Linux | libwinpr almalinux 8 | 2:2.11.7-9.el8_10 | [ALSA-2026:16019](https://patchblox.com/security/data/fix/linux/alsa-2026-16019.md) | May 11, 2026 |
| Linux | libwinpr almalinux 9 | 2:2.11.7-7.el9_8.3 | [ALSA-2026:19358](https://patchblox.com/security/data/fix/linux/alsa-2026-19358.md) | May 19, 2026 |
| Linux | libwinpr amzn 2023 | 2:3.6.3-1.amzn2023.0.7 | [ALAS2023-2026-1512](https://patchblox.com/security/data/fix/linux/alas2023-2026-1512.md) | Mar 30, 2026 |
| Linux | libwinpr ol 8 | 2:2.11.7-9.el8_10 | [ELSA-2026-16019](https://patchblox.com/security/data/fix/linux/elsa-2026-16019.md) | May 11, 2026 |
| Linux | libwinpr ol 9 | 2:2.11.7-1.el9_7.7 | [ELSA-2026-16482](https://patchblox.com/security/data/fix/linux/elsa-2026-16482.md) | May 12, 2026 |
| Linux | libwinpr-debuginfo amzn 2023 | 2:3.6.3-1.amzn2023.0.7 | [ALAS2023-2026-1512](https://patchblox.com/security/data/fix/linux/alas2023-2026-1512.md) | Mar 30, 2026 |
| Linux | libwinpr-devel RHEL 8 | 2:2.11.7-9.el8_10 | [RHSA-2026:16019](https://patchblox.com/security/data/fix/linux/rhsa-2026-16019.md) | May 15, 2026 |
| Linux | libwinpr-devel RHEL 9 | 2:2.11.7-7.el9_8.3 | [RHSA-2026:19358](https://patchblox.com/security/data/fix/linux/rhsa-2026-19358.md) | May 15, 2026 |
| Linux | libwinpr-devel almalinux 8 | 2:2.11.7-9.el8_10 | [ALSA-2026:16019](https://patchblox.com/security/data/fix/linux/alsa-2026-16019.md) | May 11, 2026 |
| Linux | libwinpr-devel almalinux 9 | 2:2.11.7-7.el9_8.3 | [ALSA-2026:19358](https://patchblox.com/security/data/fix/linux/alsa-2026-19358.md) | May 19, 2026 |
| Linux | libwinpr-devel amzn 2023 | 2:3.6.3-1.amzn2023.0.7 | [ALAS2023-2026-1512](https://patchblox.com/security/data/fix/linux/alas2023-2026-1512.md) | Mar 30, 2026 |
| Linux | libwinpr-devel ol 8 | 2:2.11.7-9.el8_10 | [ELSA-2026-16019](https://patchblox.com/security/data/fix/linux/elsa-2026-16019.md) | May 11, 2026 |
| Linux | libwinpr-devel ol 9 | 2:2.11.7-1.el9_7.7 | [ELSA-2026-16482](https://patchblox.com/security/data/fix/linux/elsa-2026-16482.md) | May 12, 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 | 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 | 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 |

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