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CVE-2026-109943— FreeRDP 3.29.0 before 3.32.0 Double Free via Async-Update Polygon Order

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.

FreeRDP 3.29.0 至 3.32.0 版本之间存在一个双重释放漏洞，位于客户端的异步更新消息代理中。当 numPoints（点数）为零时，该代理会对由解析器拥有的 PolygonSC 或 PolygonCB 指针数组进行浅拷贝，导致队列消费者和解析器的清理过程都会释放同一块内存。恶意 RDP 服务器可先发送一个包含点的多边形指令，随后发送一个点数为零的多边形指令，从而触发客户端崩溃（前提是客户已启用 +async-update 选项）。

CVSS 6.5 · Medium EPSS 0.27% · P18

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 2

VendorProduct Version RangeStatus
FreeRDP FreeRDP 3.29.0< 3.32.0 affected
3.32.0 unaffected
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I. Basic Information for CVE-2026-109943

Vulnerability Information
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Vulnerability Title
FreeRDP 3.29.0 before 3.32.0 Double Free via Async-Update Polygon Order
Source: CVE Program / CVE List V5
Vulnerability Description
FreeRDP 3.29.0 before 3.32.0 contains a double free in the client's async-update message proxy, which shallow-copies the parser-owned PolygonSC or PolygonCB points array when numPoints is zero, so both the queue consumer and parser cleanup free it. A malicious RDP server can send a point-bearing polygon order followed by a zero-point order to crash a client with +async-update enabled.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
双重释放
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
FreeRDP FreeRDP 3.29.0 ~ 3.32.0 -

II. Public POCs for CVE-2026-109943

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III. Intelligence Information for CVE-2026-109943

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Vendor Advisories for CVE-2026-109943 (1)

News Coverage for CVE-2026-109943 (1)

Same Patch Batch · FreeRDP · 2026-10-13 · 21 CVEs total

CVE-2026-109676 8.8 HIGH FreeRDP 3.0.0-beta1 before 3.32.0 Use-After-Free via Smartcard Connect
CVE-2026-109678 6.5 MEDIUM FreeRDP 3.0.0-beta1 before 3.32.0 Reachable Assertion via Emulated SCardStatusA
CVE-2026-109677 6.5 MEDIUM FreeRDP 2.0.0-beta1 before 3.28.0 Out-of-Bounds Read via LocateCardsByATRA Handler
CVE-2026-109942 6.5 MEDIUM FreeRDP 2.3.0 before 3.32.0 NULL Pointer Dereference via RD Gateway Close Channel Packet
CVE-2026-109941 6.5 MEDIUM FreeRDP 2.3.0 before 3.32.0 Infinite Loop via RD Gateway Chunked Response
CVE-2026-109938 6.5 MEDIUM FreeRDP 3.11.0 before 3.32.0 Integer Overflow via Mapped Video Geometry Update
CVE-2026-109946 6.5 MEDIUM FreeRDP 3.11.0 before 3.32.0 Reachable Assertion via AVC444 Odd Region Width
CVE-2026-109944 6.5 MEDIUM FreeRDP 3.0.0 before 3.32.0 Reachable Assertion via Stale Smartcard Handle
CVE-2026-109939 6.5 MEDIUM FreeRDP 3.27.1 before 3.32.0 NULL Pointer Dereference via Cache Bitmap V3 Order
CVE-2026-109947 6.5 MEDIUM FreeRDP 3.20.1 before 3.32.0 Unbounded Allocation via drive_process_irp_read
CVE-2026-109949 6.5 MEDIUM FreeRDP 3.0.0 before 3.32.0 PIN Brute-Force via Virtual Smartcard
CVE-2026-109953 5.3 MEDIUM FreeRDP 3.0.0 before 3.32.0 Cleartext Credential Disclosure via /restricted-admin
CVE-2026-109952 5.3 MEDIUM FreeRDP 3.0.0 before 3.32.0 Security Protocol Downgrade via Negotiation Response
CVE-2026-109680 5.3 MEDIUM FreeRDP 3.18.0 before 3.32.0 Heap Out-of-Bounds Write via ARM Redirected Username
CVE-2026-109679 5.3 MEDIUM FreeRDP 3.0.0-beta4 before 3.32.0 NULL Pointer Crash via ARM Response
CVE-2026-109945 5.3 MEDIUM FreeRDP 3.0.0 before 3.32.0 Smartcard Use-After-Free via Concurrent Disconnect and Transmi
CVE-2026-109951 5.3 MEDIUM FreeRDP 3.17.1 before 3.32.0 Heap Buffer Over-Read via Proxy DRDYNVC Channel Name
CVE-2026-109940 4.3 MEDIUM FreeRDP 3.0.0-beta1 before 3.32.0 Stack Buffer Overflow via PKCS#11 Key Name
CVE-2026-109948 4.3 MEDIUM FreeRDP 3.0.0 before 3.32.0 Memory Disclosure via SCardTransmit Smartcard Redirection
CVE-2026-109950 4.3 MEDIUM FreeRDP 3.0.0 before 3.32.0 Heap Out-of-Bounds Read via RD Gateway Messages

IV. Related Vulnerabilities

Same product: FreeRDP
Same vendor: FreeRDP
Same weakness: CWE-415

V. Comments for CVE-2026-109943

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