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CVE-2026-57156— FreeRDP: Integer overflow leading to heap buffer overflow in Orders Delta Points parsing

Quick assessment

Affected
FreeRDP FreeRDP
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

FreeRDP是FreeRDP团队开源的一款开源的远程桌面协议(RDP)的实现。 FreeRDP 3.28.0之前版本存在安全漏洞，该漏洞源于在32位构建中，libfreerdp/core/orders.c文件的update_read_delta_points函数中，将攻击者控制的点计数乘以sizeof(DELTA_POINT)时出现整数溢出，可能导致恶意RDP对等点分配过小的堆缓冲区并在初始化期间越界写入。

AI Predicted 9.8 Difficulty: Hard EPSS 0.70% · P50

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 1

VendorProduct Version RangeStatus
FreeRDP FreeRDP < 3.28.0 affected
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I. Basic Information for CVE-2026-57156

Vulnerability Information
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Vulnerability Title
FreeRDP: Integer overflow leading to heap buffer overflow in Orders Delta Points parsing
Source: CVE Program / CVE List V5
Vulnerability Description
FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.28.0 on 32-bit builds, FreeRDP clients contain an integer overflow in update_read_delta_points in libfreerdp/core/orders.c when multiplying an attacker-controlled point count by sizeof(DELTA_POINT), allowing a malicious RDP peer to allocate an undersized heap buffer and then write beyond it during initialization. This issue is fixed in version 3.28.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
堆缓冲区溢出
Source: CVE Program / CVE List V5
Vulnerability Title
FreeRDP 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
FreeRDP是FreeRDP团队开源的一款开源的远程桌面协议(RDP)的实现。 FreeRDP 3.28.0之前版本存在安全漏洞，该漏洞源于在32位构建中，libfreerdp/core/orders.c文件的update_read_delta_points函数中，将攻击者控制的点计数乘以sizeof(DELTA_POINT)时出现整数溢出，可能导致恶意RDP对等点分配过小的堆缓冲区并在初始化期间越界写入。
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

Vendor Product Affected Versions CPE Subscribe
FreeRDP FreeRDP < 3.28.0 -

II. Public POCs for CVE-2026-57156

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III. Intelligence Information for CVE-2026-57156

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Patches & Fixes for CVE-2026-57156 (3)

Vendor Advisories for CVE-2026-57156 (1)

Same Patch Batch · FreeRDP · 2026-07-10 · 4 CVEs total

CVE-2026-55827 7.5 HIGH FreeRDP: Heap out-of-bounds write in RemoteFX (RFX) Cache Bitmap V3 decode
CVE-2026-57157 6.5 MEDIUM Out-of-bounds read in the camera device enumerator server (rdpecam) via unterminated Devic
CVE-2026-57158 FreeRDP planar_decompress_plane_rle_only: heap OOB read — incomplete fix for CVE-2026-2353

IV. Related Vulnerabilities

Same product: FreeRDP
Same vendor: FreeRDP
Same weakness: CWE-122

V. Comments for CVE-2026-57156

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