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: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
堆缓冲区溢出
Source: CVE Program / CVE List V5
Vulnerability Title
FreeRDP 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
FreeRDP是FreeRDP团队的一款开源的远程桌面协议（RDP）的实现。 FreeRDP 3.26.0之前版本存在安全漏洞，该漏洞源于gdi_CacheToSurface中存在堆缓冲区溢出，可能导致远程攻击者写入越界堆内存，进而实现远程代码执行或客户端崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China 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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Patches & Fixes for CVE-2026-40033 (2)
Vendor Advisories for CVE-2026-40033 (2)
IV. Related Vulnerabilities
Same product: FreeRDP
- CVE-2026-68580
FreeRDP before 3.29.0 Integer Overflow via Audio Input Chann - CVE-2026-68579
FreeRDP before 3.30.0 Heap Overflow via CliprdrStream_Read - CVE-2026-67288
FreeRDP before 3.29.0 Denial of Service via smartcard cache - CVE-2026-67295
FreeRDP before 3.29.0 Path Traversal via drive redirection - CVE-2026-66401
FreeRDP before 3.29.0 Out-of-Bounds Read via UVC H.264
Same vendor: FreeRDP
- CVE-2026-68580
FreeRDP before 3.29.0 Integer Overflow via Audio Input Chann - CVE-2026-68579
FreeRDP before 3.30.0 Heap Overflow via CliprdrStream_Read - CVE-2026-67295
FreeRDP before 3.29.0 Path Traversal via drive redirection - CVE-2026-67288
FreeRDP before 3.29.0 Denial of Service via smartcard cache - CVE-2026-66401
FreeRDP before 3.29.0 Out-of-Bounds Read via UVC H.264
Same weakness: CWE-122
- CVE-2026-19259
MZ Automation libiec61850 MMS Protocol Workflow iec61850_com - CVE-2026-19206
MZ Automation libiec61850 ASDU Element sv_subscriber.c SVRec - CVE-2026-18938
P11-kit: integer overflow in rpc attribute-array length calc - CVE-2026-19156
Google Chrome 缓冲区错误漏洞 - CVE-2026-19138
Chrome <151.0.7922.109堆缓冲区溢出漏洞
V. Comments for CVE-2026-40033
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