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CVE-2026-55827— FreeRDP: Heap out-of-bounds write in RemoteFX (RFX) Cache Bitmap V3 decode

Quick assessment

Affected
FreeRDP FreeRDP
Exploitation
Public or AI PoC available; prioritize validation
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 3.27.1之前版本存在缓冲区错误漏洞，该漏洞源于在使用非默认的/cache:codec:rfx选项启动客户端时，将桌面步幅和高度传递给RemoteFX解码，而仅在gdi_Bitmap_Decompress中为较小的DstWidth和DstHeight分配bitmap->data，可能导致恶意RDP服务器触发堆越界写入。

CVSS 7.5 · High EPSS 0.53% · P43

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
FreeRDP FreeRDP < 3.27.1 affected
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I. Basic Information for CVE-2026-55827

Vulnerability Information
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Vulnerability Title
FreeRDP: Heap out-of-bounds write in RemoteFX (RFX) Cache Bitmap V3 decode
Source: CVE Program / CVE List V5
Vulnerability Description
FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.27.1, FreeRDP clients launched with the non-default /cache:codec:rfx option pass desktop stride and height to RemoteFX decoding for Cache Bitmap V3 data while allocating bitmap->data only for the smaller DstWidth and DstHeight in gdi_Bitmap_Decompress, allowing a malicious RDP server to trigger a heap out-of-bounds write with attacker-controlled offset and content. This issue is fixed in version 3.27.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
缓冲区大小计算不正确
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 3.27.1之前版本存在缓冲区错误漏洞，该漏洞源于在使用非默认的/cache:codec:rfx选项启动客户端时，将桌面步幅和高度传递给RemoteFX解码，而仅在gdi_Bitmap_Decompress中为较小的DstWidth和DstHeight分配bitmap->data，可能导致恶意RDP服务器触发堆越界写入。
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 < 3.27.1 -

II. Public POCs for CVE-2026-55827

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 9230 chars
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III. Intelligence Information for CVE-2026-55827

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Patches & Fixes for CVE-2026-55827 (2)

Vendor Advisories for CVE-2026-55827 (1)

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

CVE-2026-57157 6.5 MEDIUM Out-of-bounds read in the camera device enumerator server (rdpecam) via unterminated Devic
CVE-2026-57156 FreeRDP: Integer overflow leading to heap buffer overflow in Orders Delta Points parsing
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-131

V. Comments for CVE-2026-55827

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