PT-2026-43250 · Freerdp+1 · Freerdp+1

Kevin-Valerio · CVE-2026-40033 · Published 2026-04-21 · Updated 2026-07-20

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

DoS

RCE

Heap Based Buffer Overflow

Memory Corruption

Weakness Enumeration

CWE-122

CWE-787

Related Identifiers

ALSA-2026:36203

BDU:2026-07426

CVE-2026-40033

GHSA-P6R2-4HGM-M6FF

OPENSUSE-SU-2026:10948-1

OPENSUSE-SU-2026:21116-1

RHSA-2026:36203

SUSE-SU-2026:22194-1

USN-8561-1

Affected Products

Freerdp

Red Os

References · 103

• 🔥 https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-p6r2-4hgm-m6ff · Exploit
• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/40xxx/CVE-2026-40033.json · Exploit
• https://github.com/FreeRDP/FreeRDP/commit/d7508ebcd82842a691ae4941e5104d14240a89ae · Patch
• https://github.com/FreeRDP/FreeRDP/commit/23b36cd00ebf0ccd97750fcdbc9aa2f362352da7 · Patch
• https://security-tracker.debian.org/tracker/CVE-2026-40033 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-31806 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-55648 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-44420 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-40033 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-33984 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-55827 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-40033 · Vendor Advisory
• http://repo.red-soft.ru/redos/8.0/x86_64/updates · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-44422 · Vendor Advisory
• https://ubuntu.com/security/notices/USN-8561-1 · Vendor Advisory