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CVE-2026-109253— FreeRDP 3.9.0 before 3.32.0 RDPEAR NDR Scalar Out-of-Bounds Read

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.

在 FreeRDP 版本 3.9.0 至 3.31.0（即 3.32.0 之前）中，RDPEAR 的 NDR 标量读取器存在一个越界读取漏洞。该漏洞的根源在于，这些读取器在消耗对齐填充（alignment padding）之前，先检查了值长度。恶意或被劫持的 RDP 服务器可以向使用“远程凭据保护”（Remote Credential Guard）的客户端发送精心构造的、未对齐的 RDPEAR 负载数据（例如 CreateApReqAuthenticatorReq 消息），从而导致越界读取，并可能引发客户端进程崩溃

CVSS 5.3 · Medium EPSS 0.23% · P13

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 2

VendorProduct Version RangeStatus
FreeRDP FreeRDP 3.9.0< 3.32.0 affected
3.32.0 unaffected
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I. Basic Information for CVE-2026-109253

Vulnerability Information
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Vulnerability Title
FreeRDP 3.9.0 before 3.32.0 RDPEAR NDR Scalar Out-of-Bounds Read
Source: CVE Program / CVE List V5
Vulnerability Description
FreeRDP from 3.9.0 before 3.32.0 contains an out-of-bounds read vulnerability in the RDPEAR NDR scalar readers, which check value length before consuming alignment padding. Malicious or compromised RDP servers can send crafted unaligned RDPEAR payloads, such as CreateApReqAuthenticatorReq messages, to clients using Remote Credential Guard, causing over-reads and potentially crashing the client process.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
FreeRDP FreeRDP 3.9.0 ~ 3.32.0 -

II. Public POCs for CVE-2026-109253

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III. Intelligence Information for CVE-2026-109253

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Vendor Advisories for CVE-2026-109253 (1)

Other References for CVE-2026-109253 (1)

Same Patch Batch · FreeRDP · 2026-10-12 · 18 CVEs total

CVE-2026-109242 7.1 HIGH FreeRDP before 3.0.0 and 3.6.0 before 3.32.0 Uninitialized Heap Disclosure via Progressive
CVE-2026-109255 6.8 MEDIUM FreeRDP 3.0.0 before 3.32.0 heap buffer overflow via license_check_stream_length
CVE-2026-109245 6.8 MEDIUM FreeRDP 3.0.0 before 3.32.0 Improper Certificate Validation in freerdp_http_request
CVE-2026-109244 6.6 MEDIUM FreeRDP 2.0.0 before 3.32.0 Insecure Private Key Permissions in winpr-makecert
CVE-2026-109250 6.6 MEDIUM FreeRDP 3.0.0 before 3.32.0 Heap Buffer Overflow via PKCS#11 collect_keys()
CVE-2026-109248 6.5 MEDIUM FreeRDP 3.0.0 before 3.32.0 Heap Out-of-Bounds Read via WinPR Clipboard cFileName
CVE-2026-109246 6.5 MEDIUM FreeRDP before 3.32.0 Shadow Server Divide-by-Zero via Frame Acknowledge PDU
CVE-2026-109257 5.9 MEDIUM FreeRDP before 3.32.0 Double Free via NSCodec plane growth failure
CVE-2026-109254 5.9 MEDIUM FreeRDP 2.1.0 before 3.32.0 Use-After-Free via rdpsnd Disconnect Path
CVE-2026-109249 5.5 MEDIUM FreeRDP 3.0.0 before 3.32.0 Heap Out-of-Bounds Read via Remote Assistance File Parsing
CVE-2026-109251 5.3 MEDIUM FreeRDP before 3.32.0 Out-of-Bounds Write via MS-RDPEGT Video Geometry
CVE-2026-109252 5.3 MEDIUM FreeRDP from 3.9.0 before 3.32.0 RDPEAR NULL Pointer Dereference via KERB_RPC_INTERNAL_NAM
CVE-2026-109256 5.3 MEDIUM FreeRDP 3.10.0 through 3.32.2 Heap Buffer Overflow in WinPR PNG Conversion
CVE-2026-109243 4.4 MEDIUM FreeRDP 3.0.0 before 3.32.0 Insecure Permissions on Soft-Smartcard Private Key File
CVE-2026-109240 3.1 LOW FreeRDP 3.11.0 before 3.32.1 Reachable Assertion DoS via urb_isoch_transfer
CVE-2026-109241 3.1 LOW FreeRDP before 3.32.0 NULL Dereference in Video Redirection Channel
CVE-2026-109247 3.1 LOW FreeRDP before 3.32.0 Path Traversal via Clipboard cFileName

IV. Related Vulnerabilities

Same product: FreeRDP
Same vendor: FreeRDP
Same weakness: CWE-125

V. Comments for CVE-2026-109253

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