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CVE-2026-67298— FreeRDP 3.28.0 Heap Buffer Overflow via RAIL orderLength Underflow

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团队开源的一款远程桌面协议(RDP)的实现。 FreeRDP 3.28.0及之前版本存在数字错误漏洞，该漏洞源于服务器端RAIL通道处理程序在处理RAIL PDU标头时，未验证orderLength字段是否至少为标头长度，导致无符号整数下溢，从而绕过容量检查，造成越界堆写入，可能导致恶意或受损的RDP客户端破坏堆并导致服务器崩溃。

CVSS 7.5 · High EPSS 0.38% · P31

Possible ATT&CK Techniques 1 AI

T1210 · Exploitation of Remote Services

Affected Version Matrix 2

VendorProduct Version RangeStatus
FreeRDP FreeRDP < 3.29.0 affected
3.29.0 unaffected
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I. Basic Information for CVE-2026-67298

Vulnerability Information
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Vulnerability Title
FreeRDP 3.28.0 Heap Buffer Overflow via RAIL orderLength Underflow
Source: CVE Program / CVE List V5
Vulnerability Description
FreeRDP versions 3.28.0 and earlier contain a heap buffer overflow in the server-side RAIL channel handler (rail_server_handle_messages() in channels/rail/server/rail_main.c). When processing a RAIL PDU header, the code subtracts RAIL_PDU_HEADER_LENGTH from the peer-controlled orderLength field without first verifying orderLength is at least the header length. For orderLength values 0..3 this causes an unsigned integer underflow to a very large size, which bypasses the Stream_EnsureRemainingCapacity() capacity check (due to pointer arithmetic wraparound) and is then passed to WTSVirtualChannelRead(), resulting in an out-of-bounds heap write. A malicious or compromised RDP client can exploit this to corrupt the heap and crash the server. Fixed in FreeRDP 3.29.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
整数下溢(超界折返)
Source: CVE Program / CVE List V5
Vulnerability Title
FreeRDP 数字错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
FreeRDP是FreeRDP团队开源的一款远程桌面协议(RDP)的实现。 FreeRDP 3.28.0及之前版本存在数字错误漏洞，该漏洞源于服务器端RAIL通道处理程序在处理RAIL PDU标头时，未验证orderLength字段是否至少为标头长度，导致无符号整数下溢，从而绕过容量检查，造成越界堆写入，可能导致恶意或受损的RDP客户端破坏堆并导致服务器崩溃。
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

Vendor Product Affected Versions CPE Subscribe
FreeRDP FreeRDP 0 ~ 3.29.0 -

II. Public POCs for CVE-2026-67298

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 9689 chars
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In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
100+ AI POC generations per month

III. Intelligence Information for CVE-2026-67298

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Patches & Fixes for CVE-2026-67298 (1)

Vendor Advisories for CVE-2026-67298 (2)

Same Patch Batch · FreeRDP · 2026-08-01 · 21 CVEs total

CVE-2026-66402 9.8 CRITICAL FreeRDP before 3.29.0 TLS Certificate Identity Validation Bypass
CVE-2026-67289 9.8 CRITICAL FreeRDP before 3.29.0 HTTP Proxy Request Injection via Redirection
CVE-2026-67305 9.4 CRITICAL FreeRDP Windows Client before 3.29.0 Heap Buffer Overflow via Cliprdr
CVE-2026-67291 7.5 HIGH FreeRDP before 3.29.0 Heap Out-of-Bounds Read via GLYPH_FRAGMENT_ADD
CVE-2026-67304 7.5 HIGH FreeRDP before 3.29.0 NULL Dereference via smartcard cleanup
CVE-2026-67297 7.5 HIGH FreeRDP before 3.29.0 Resource Exhaustion via chunked HTTP response
CVE-2026-67301 7.5 HIGH FreeRDP before 3.29.0 Out-of-bounds Read via Polygon async message-proxy
CVE-2026-67290 7.5 HIGH FreeRDP before 3.29.0 Heap Out-of-Bounds Read via TSMF
CVE-2026-67296 7.5 HIGH FreeRDP before 3.29.0 Denial of Service via RDPEI PDU
CVE-2026-67299 7.5 HIGH FreeRDP before 3.29.0 Use-After-Free via WindowIcon async message
CVE-2026-67300 7.5 HIGH FreeRDP before 3.29.0 Use-After-Free via async message proxy
CVE-2026-67288 7.5 HIGH FreeRDP before 3.29.0 Denial of Service via smartcard cache
CVE-2026-67292 6.5 MEDIUM FreeRDP before 3.29.0 WebSocket Ping Buffer Over-disclosure
CVE-2026-67295 6.3 MEDIUM FreeRDP before 3.29.0 Path Traversal via drive redirection
CVE-2026-67294 5.9 MEDIUM FreeRDP before 3.29.0 TLS Certificate EKU Bypass
CVE-2026-67306 5.4 MEDIUM FreeRDP before 3.29.0 Out-of-Bounds Read via Planar RLE
CVE-2026-67303 4.3 MEDIUM FreeRDP before 3.29.0 Denial of Service via serial DeviceControl
CVE-2026-67302 4.3 MEDIUM FreeRDP rdpecam StartStreamsRequest divide-by-zero denial of service
CVE-2026-67293 4.2 MEDIUM FreeRDP before 3.29.0 Improper Certificate Hostname Validation
CVE-2026-66401 2.1 LOW FreeRDP before 3.29.0 Out-of-Bounds Read via UVC H.264

IV. Related Vulnerabilities

Same product: FreeRDP
Same vendor: FreeRDP
Same weakness: CWE-191

V. Comments for CVE-2026-67298

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