Vulnerability · Published Jan 19, 2026 · Assigned by GitHub_M
CVE-2026-23732FreeRDP has heap-buffer-overflow in Glyph_Alloc
Medium 5.5
In plain English
A medium-severity heap buffer overflow in FreeRDP from FreeRDP. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 48% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.21.0, FastGlyph parsing trusts `cbData`/remaining length and never validates against the minimum size implied by `cx/cy`. A malicious server can trigger a client‑side global buffer overflow, causing a crash (DoS). Version 3.21.0 contains a patch for the issue.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:10 | freerdp | 2:3.10.3-5.el10_1.5 | ALSA-2026:6799 |
| AlmaLinux:8 | freerdp | 2:2.11.7-6.el8_10 | ALSA-2026:6918 |
| AlmaLinux:9 | freerdp | 2:2.11.7-1.el9_7.5 | ALSA-2026:6340 |
| AlmaLinux:10 | freerdp-devel | 2:3.10.3-5.el10_1.5 | ALSA-2026:6799 |
| AlmaLinux:8 | freerdp-devel | 2:2.11.7-6.el8_10 | ALSA-2026:6918 |
| AlmaLinux:9 | freerdp-devel | 2:2.11.7-1.el9_7.5 | ALSA-2026:6340 |
| AlmaLinux:10 | freerdp-libs | 2:3.10.3-5.el10_1.5 | ALSA-2026:6799 |
| AlmaLinux:8 | freerdp-libs | 2:2.11.7-6.el8_10 | ALSA-2026:6918 |
| AlmaLinux:9 | freerdp-libs | 2:2.11.7-1.el9_7.5 | ALSA-2026:6340 |
| AlmaLinux:10 | freerdp-server | 2:3.10.3-5.el10_1.5 | ALSA-2026:6799 |
| AlmaLinux:10 | libwinpr | 2:3.10.3-5.el10_1.5 | ALSA-2026:6799 |
| AlmaLinux:8 | libwinpr | 2:2.11.7-6.el8_10 | ALSA-2026:6918 |
| AlmaLinux:9 | libwinpr | 2:2.11.7-1.el9_7.5 | ALSA-2026:6340 |
| AlmaLinux:10 | libwinpr-devel | 2:3.10.3-5.el10_1.5 | ALSA-2026:6799 |
| AlmaLinux:8 | libwinpr-devel | 2:2.11.7-6.el8_10 | ALSA-2026:6918 |
| AlmaLinux:9 | libwinpr-devel | 2:2.11.7-1.el9_7.5 | ALSA-2026:6340 |
| Alpine:v3.23 | freerdp | 3.22.0-r0 | ALPINE-CVE-2026-23732 |
| Alpine:v3.24 | freerdp | 3.21.0-r0 | ALPINE-CVE-2026-23732 |
| Debian:12 | freerdp2 | no fix listed | DEBIAN-CVE-2026-23732 |
| Debian:13 | freerdp3 | 3.15.0+dfsg-2.1+deb13u1 | DEBIAN-CVE-2026-23732 |
| Debian:14 | freerdp3 | 3.21.0+dfsg-1 | DEBIAN-CVE-2026-23732 |
| Rocky Linux:10 | freerdp | 2:3.10.3-5.el10_1.5 | RLSA-2026:6799 |
| Rocky Linux:8 | freerdp | 2:2.11.7-6.el8_10 | RLSA-2026:6918 |
| Rocky Linux:9 | freerdp | 2:2.11.7-1.el9_7.5 | RLSA-2026:6340 |
| Ubuntu:22.04:LTS | freerdp2 | no fix listed | UBUNTU-CVE-2026-23732 |
| Ubuntu:24.04:LTS | freerdp2 | no fix listed | UBUNTU-CVE-2026-23732 |
| Ubuntu:24.04:LTS | freerdp3 | 3.5.1+dfsg1-0ubuntu1.4 | USN-8105-1 |
| Ubuntu:24.04:LTS | freerdp3 | 3.5.1+dfsg1-0ubuntu1.4 | UBUNTU-CVE-2026-23732 |
| Ubuntu:25.10 | freerdp3 | 3.16.0+dfsg-2ubuntu0.3 | USN-8105-1 |
| Ubuntu:25.10 | freerdp3 | 3.16.0+dfsg-2ubuntu0.3 | UBUNTU-CVE-2026-23732 |
Affected products (as reported)
Weakness: CWE-122 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P
References
- https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-7qxp-j2fj-c3pp x_refsource_CONFIRM
- https://github.com/FreeRDP/FreeRDP/blob/f96ee2a6dd02739325c2a4e36a14978b561f00ea/libfreerdp/cache/glyph.c#L463-L480 x_refsource_MISC
- https://github.com/FreeRDP/FreeRDP/blob/f96ee2a6dd02739325c2a4e36a14978b561f00ea/libfreerdp/codec/color.c#L261-L277 x_refsource_MISC
- https://github.com/FreeRDP/FreeRDP/blob/f96ee2a6dd02739325c2a4e36a14978b561f00ea/libfreerdp/core/graphics.c#L138 x_refsource_MISC
- https://github.com/FreeRDP/FreeRDP/blob/f96ee2a6dd02739325c2a4e36a14978b561f00ea/libfreerdp/core/orders.c#L2186C17-L2199 x_refsource_MISC
- https://github.com/FreeRDP/FreeRDP/releases/tag/3.21.0 x_refsource_MISC