Vulnerability · Published Aug 1, 2026 · Assigned by VulnCheck
CVE-2026-67291FreeRDP before 3.29.0 Heap Out-of-Bounds Read via GLYPH_FRAGMENT_ADD
High 7.5
In plain English
A high-severity out-of-bounds read 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 35% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
FreeRDP before 3.29.0 (affected versions <= 3.28.0) contains a heap out-of-bounds read in update_process_glyph_fragments()/glyph_cache_fragment_put() in libfreerdp/cache/glyph.c. When handling a GLYPH_FRAGMENT_ADD update, the code reads a one-byte server-controlled declared fragment size but does not verify it fits within the remaining received buffer before allocating and copying that many bytes. A malicious RDP server can send a short fragment with an oversized declared size, causing the client to read beyond the allocated buffer, resulting in an out-of-bounds read and client crash.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:10 | freerdp | 2:3.10.3-12.el10_2.10 | ALSA-2026:61378 |
| AlmaLinux:8 | freerdp | 2:2.11.7-12.el8_10 | ALSA-2026:62571 |
| AlmaLinux:9 | freerdp | 2:2.11.7-7.el9_8.6 | ALSA-2026:61379 |
| AlmaLinux:10 | freerdp-devel | 2:3.10.3-12.el10_2.10 | ALSA-2026:61378 |
| AlmaLinux:8 | freerdp-devel | 2:2.11.7-12.el8_10 | ALSA-2026:62571 |
| AlmaLinux:9 | freerdp-devel | 2:2.11.7-7.el9_8.6 | ALSA-2026:61379 |
| AlmaLinux:10 | freerdp-libs | 2:3.10.3-12.el10_2.10 | ALSA-2026:61378 |
| AlmaLinux:8 | freerdp-libs | 2:2.11.7-12.el8_10 | ALSA-2026:62571 |
| AlmaLinux:9 | freerdp-libs | 2:2.11.7-7.el9_8.6 | ALSA-2026:61379 |
| AlmaLinux:10 | freerdp-server | 2:3.10.3-12.el10_2.10 | ALSA-2026:61378 |
| AlmaLinux:10 | libwinpr | 2:3.10.3-12.el10_2.10 | ALSA-2026:61378 |
| AlmaLinux:8 | libwinpr | 2:2.11.7-12.el8_10 | ALSA-2026:62571 |
| AlmaLinux:9 | libwinpr | 2:2.11.7-7.el9_8.6 | ALSA-2026:61379 |
| AlmaLinux:10 | libwinpr-devel | 2:3.10.3-12.el10_2.10 | ALSA-2026:61378 |
| AlmaLinux:8 | libwinpr-devel | 2:2.11.7-12.el8_10 | ALSA-2026:62571 |
| AlmaLinux:9 | libwinpr-devel | 2:2.11.7-7.el9_8.6 | ALSA-2026:61379 |
| Debian:12 | freerdp2 | no fix listed | DEBIAN-CVE-2026-67291 |
| Debian:13 | freerdp3 | no fix listed | DEBIAN-CVE-2026-67291 |
| Debian:14 | freerdp3 | 3.29.0+dfsg-1 | DEBIAN-CVE-2026-67291 |
| Rocky Linux:10 | freerdp | 2:3.10.3-12.el10_2.10 | RLSA-2026:61378 |
| Rocky Linux:8 | freerdp | 2:2.11.7-12.el8_10 | RLSA-2026:62571 |
| Rocky Linux:9 | freerdp | 2:2.11.7-7.el9_8.6 | RLSA-2026:61379 |
| Ubuntu:22.04:LTS | freerdp2 | no fix listed | UBUNTU-CVE-2026-67291 |
| Ubuntu:24.04:LTS | freerdp3 | 3.30.0+dfsg-0ubuntu0.24.04.1 | UBUNTU-CVE-2026-67291 |
| Ubuntu:26.04:LTS | freerdp3 | 3.30.0+dfsg-0ubuntu0.26.04.1 | UBUNTU-CVE-2026-67291 |
Affected products (as reported)
Weakness: CWE-125 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
References
- GitHub Security Advisory (GHSA-hgj8-g595-wfc6) vendor-advisory
- Patch Commit patch
- VulnCheck Advisory: FreeRDP before 3.29.0 Heap Out-of-Bounds Read via GLYPH_FRAGMENT_ADD third-party-advisory