CVE-2026-40033— FreeRDP - Heap-buffer-overflow in gdi_CacheToSurface via rectangle validation bypass
Possible ATT&CK Techniques 1AI
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I. Basic Information for CVE-2026-40033
Vulnerability Information
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Vulnerability Title
FreeRDP - Heap-buffer-overflow in gdi_CacheToSurface via rectangle validation bypass
Source: NVD (National Vulnerability Database)
Vulnerability Description
FreeRDP before 3.26.0 contains a heap-buffer-overflow vulnerability in gdi_CacheToSurface that allows remote attackers to write out-of-bounds heap memory. The vulnerability occurs because rectangle validation clamps coordinates to UINT16_MAX but performs copy operations using unclamped cache entry dimensions, enabling malicious RDP servers to trigger large out-of-bounds writes and potentially achieve remote code execution or client crash.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
堆缓冲区溢出
Source: NVD (National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2026-40033
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POCPremium
Qwen3.6-35B-A3B · 13881 chars
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III. Intelligence Information for CVE-2026-40033
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Vendor Advisories for CVE-2026-40033 (2)
IV. Related Vulnerabilities
Same product: FreeRDP
- CVE-2026-40254
FreeRDP: contains_dotdot() off-by-one allows drive channel p - CVE-2026-33995
FreeRDP: Possible double free in kerberos_AcceptSecurityCont - CVE-2026-33987
FreeRDP: Persistent Cache bmpSize Desync - Heap OOB Write - CVE-2026-33986
FreeRDP: H.264 YUV Buffer Dimension Desync - Heap OOB Write - CVE-2026-33985
FreeRDP: ClearCodec Glyph Cache Count Desync - Heap OOB Read
Same vendor: FreeRDP
- CVE-2026-40254
FreeRDP: contains_dotdot() off-by-one allows drive channel p - CVE-2026-33995
FreeRDP: Possible double free in kerberos_AcceptSecurityCont - CVE-2026-33987
FreeRDP: Persistent Cache bmpSize Desync - Heap OOB Write - CVE-2026-33986
FreeRDP: H.264 YUV Buffer Dimension Desync - Heap OOB Write - CVE-2026-33985
FreeRDP: ClearCodec Glyph Cache Count Desync - Heap OOB Read
Same weakness: CWE-122
- CVE-2026-4391
TeamSpeak 3 Server ECC Key heap-based overflow - CVE-2026-8175
Multiple vulnerabilities in Aspera applications. - CVE-2026-9605
GNU libredwg Dwgbmp Utility bits.c bit_read_RC heap-based ov - CVE-2026-44983
smallbitvec: Safe API Triggered Heap Buffer Overflow via Int - CVE-2026-8834
IBM HTTP Server is affected by multiple vulnerabilities
V. Comments for CVE-2026-40033
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