Vulnerability · Published Mar 30, 2026 · Assigned by GitHub_M
CVE-2026-33987FreeRDP: Persistent Cache bmpSize Desync - Heap OOB Write
High 7.1
In plain English
A high-severity heap buffer overflow in FreeRDP from FreeRDP. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 1% 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 3.24.2, in persistent_cache_read_entry_v3() in libfreerdp/cache/persistent.c, persistent->bmpSize is updated before winpr_aligned_recalloc(). If realloc fails, bmpSize is inflated while bmpData points to the old buffer. This issue has been patched in version 3.24.2.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:10 | freerdp | 2:3.10.3-5.el10_1.8 | ALSA-2026:16014 |
| AlmaLinux:10 | freerdp-devel | 2:3.10.3-5.el10_1.8 | ALSA-2026:16014 |
| AlmaLinux:10 | freerdp-libs | 2:3.10.3-5.el10_1.8 | ALSA-2026:16014 |
| AlmaLinux:10 | freerdp-server | 2:3.10.3-5.el10_1.8 | ALSA-2026:16014 |
| AlmaLinux:10 | libwinpr | 2:3.10.3-5.el10_1.8 | ALSA-2026:16014 |
| AlmaLinux:10 | libwinpr-devel | 2:3.10.3-5.el10_1.8 | ALSA-2026:16014 |
| Alpine:v3.23 | freerdp | 3.24.2-r0 | ALPINE-CVE-2026-33987 |
| Alpine:v3.24 | freerdp | 3.24.2-r0 | ALPINE-CVE-2026-33987 |
| Debian:12 | freerdp2 | no fix listed | DEBIAN-CVE-2026-33987 |
| Debian:13 | freerdp3 | 3.15.0+dfsg-2.1+deb13u2 | DEBIAN-CVE-2026-33987 |
| Debian:14 | freerdp3 | 3.24.2+dfsg-1 | DEBIAN-CVE-2026-33987 |
| Rocky Linux:10 | freerdp | 2:3.10.3-12.el10_2.5 | RLSA-2026:19142 |
| Rocky Linux:10 | freerdp | 2:3.10.3-5.el10_1.8 | RLSA-2026:16014 |
| Ubuntu:22.04:LTS | freerdp2 | no fix listed | UBUNTU-CVE-2026-33987 |
| Ubuntu:24.04:LTS | freerdp3 | 3.30.0+dfsg-0ubuntu0.24.04.1 | USN-8561-1 |
| Ubuntu:24.04:LTS | freerdp3 | 3.30.0+dfsg-0ubuntu0.24.04.1 | UBUNTU-CVE-2026-33987 |
| Ubuntu:25.10 | freerdp3 | no fix listed | UBUNTU-CVE-2026-33987 |
| Ubuntu:26.04:LTS | freerdp3 | 3.30.0+dfsg-0ubuntu0.26.04.1 | USN-8561-1 |
Affected products (as reported)
Weakness: CWE-122, CWE-131 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H