PT-2026-43250 · Freerdp · Freerdp

Kevin-Valerio · Published 2026-04-21 · Updated 2026-05-27 · CVE-2026-40033

Positive Technologies (AI Summary)

CVSS v2.0

10

High

Base vector

AV:N/AC:L/Au:N/C:C/I:C/A:C

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

Description A heap-buffer-overflow exists in the gdi CacheToSurface() function. This occurs because rectangle validation clamps coordinates to UINT16 MAX but copy operations use unclamped cache entry dimensions. This allows a malicious RDP server to trigger large out-of-bounds writes to heap memory, which could lead to a client crash or remote code execution.

Recommendations Update to version 3.26.0 or later.

Exploit

Fix

RCE

Heap Based Buffer Overflow

Weakness Enumeration

CWE-122

Related Identifiers

BDU:2026-07426

CVE-2026-40033

Affected Products

Freerdp

References · 9

• 🔥 https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-p6r2-4hgm-m6ff · Exploit
• https://github.com/FreeRDP/FreeRDP/commit/23b36cd00ebf0ccd97750fcdbc9aa2f362352da7 · Patch
• https://bdu.fstec.ru/vul/2026-07426 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-40033 · Security Note
• https://t.me/cveNotify/164853 · Telegram Post
• https://twitter.com/dailycve/status/2059689389362458940 · Twitter Post
• https://vulncheck.com/advisories/freerdp-heap-buffer-overflow-in-gdi-cachetosurface-via-rectangle-validation-bypass · Note
• https://t.me/CVEtracker/54984 · Telegram Post
• https://twitter.com/ADKCyber/status/2059423779067969886 · Twitter Post