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

CVSS 7.5 · High

Possible ATT&CK Techniques 1AI

T1190 · Exploit Public-Facing Application
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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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
释放后使用
Source: NVD (National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
FreeRDPFreeRDP < 3.26.0 -

II. Public POCs for CVE-2026-44422

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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-2026-444208.8 HIGHFreeRDP cliprdr server heap-buffer-overflow via undersized capabilitySetLength in CB_CLIP_
CVE-2026-444218.8 HIGHFreeRDP RDPGFX CacheToSurface heap-buffer-overflow via clamped-rectangle validation bypass
CVE-2026-45700Heap-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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