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CVE-2026-44422— FreeRDP RDPEAR NDR ref-id aliasing causes client-side UAF/double-free and type confusion

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之前版本存在资源管理错误漏洞，该漏洞源于RDPEAR NDR解析器接受多个逻辑指针字段的非空NDR指针ref-id而未跟踪指向对象的预期NDR类型或所有权，导致同一ref-id重用时分配合并对象并导致释放后重用或双重释放。

CVSS 7.5 · High EPSS 0.66% · P50

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
FreeRDP FreeRDP < 3.26.0 affected
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I. Basic Information for CVE-2026-44422

Vulnerability Information
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Vulnerability Title
FreeRDP RDPEAR NDR ref-id aliasing causes client-side UAF/double-free and type confusion
Source: CVE Program / CVE List V5
Vulnerability Description
FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.26.0, FreeRDP's RDPEAR NDR parser accepts one non-null NDR pointer ref-id for multiple logical pointer fields without tracking the pointed object's expected NDR type or ownership. When the same ref-id is reused across two pointer fields, the parser assigns the same heap object to both output fields. The generic destructor later walks each field independently and destroys/frees both pointers. This causes a malicious-server-triggerable heap use-after-free / double-free in the FreeRDP client's RDPEAR authentication-redirection path. This vulnerability is fixed in 3.26.0.
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
释放后使用
Source: CVE Program / CVE List V5
Vulnerability Title
FreeRDP 资源管理错误漏洞
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之前版本存在资源管理错误漏洞，该漏洞源于RDPEAR NDR解析器接受多个逻辑指针字段的非空NDR指针ref-id而未跟踪指向对象的预期NDR类型或所有权，导致同一ref-id重用时分配合并对象并导致释放后重用或双重释放。
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 < 3.26.0 -

II. Public POCs for CVE-2026-44422

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 11254 chars
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III. Intelligence Information for CVE-2026-44422

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Vendor Advisories for CVE-2026-44422 (1)

Same Patch Batch · FreeRDP · 2026-05-29 · 4 CVEs total

CVE-2026-44420 8.8 HIGH FreeRDP cliprdr server heap-buffer-overflow via undersized capabilitySetLength in CB_CLIP_
CVE-2026-44421 8.8 HIGH FreeRDP RDPGFX CacheToSurface heap-buffer-overflow via clamped-rectangle validation bypass
CVE-2026-45700 7.7 HIGH Heap-buffer-overflow write in planar bitmap decoder

IV. Related Vulnerabilities

Same product: FreeRDP
Same vendor: FreeRDP
Same weakness: CWE-416

V. Comments for CVE-2026-44422

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