PT-2026-44982 · Freerdp · Freerdp

Kevin-Valerio · Published 2026-05-29 · Updated 2026-05-30 · CVE-2026-44421

Positive Technologies (AI Summary)

CVSS v3.1

8.8

High

Base vector

AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions FreeRDP versions prior to 3.26.0

Description A heap-buffer-overflow write can be triggered in the client when connecting to a malicious RDP server that sends crafted RDPGFX PDUs (Protocol Data Units). The issue occurs in the gdi CacheToSurface() function, which validates a destination rectangle clamped to UINT16 MAX but executes the copy operation using the original cacheEntry->width and cacheEntry->height variables. This results in a large out-of-bounds heap write that may lead to client crashes or remote code execution. This issue is only reachable when the client has RDPGFX enabled.

Recommendations Update to version 3.26.0. As a temporary workaround, disable RDPGFX to minimize the risk of exploitation.

Exploit

Fix

Heap Based Buffer Overflow

Weakness Enumeration

CWE-122

Related Identifiers

CVE-2026-44421

Affected Products

Freerdp

References · 4

• 🔥 https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-p6r2-4hgm-m6ff · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2026-44421 · Security Note
• https://twitter.com/VulmonFeeds/status/2060530306537410833 · Twitter Post
• https://t.me/CVEtracker/55292 · Telegram Post