CVE-2026-109951— FreeRDP 3.17.1 before 3.32.0 Heap Buffer Over-Read via Proxy DRDYNVC Channel Name
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 3.17.1 至 3.32.0（不含 3.32.0）版本中，freerdp-proxy 的 DRDYNVC 通道处理器中的 DynvcTrackerHandleCreateBack 函数存在一个堆缓冲区越界读取漏洞。恶意后端 RDP 服务器可利用该漏洞，越界读取堆内存。攻击者可发送一个 CREATE_REQUEST_PDU 消息，其通道名称缺少空终止字节（NUL byte），从而导致无界 snprintf 读取操作，将内存内容泄漏至代理日志中，或引发进程崩溃。
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I. Basic Information for CVE-2026-109951
Vulnerability Information
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Vulnerability Title
FreeRDP 3.17.1 before 3.32.0 Heap Buffer Over-Read via Proxy DRDYNVC Channel Name
Source: CVE Program / CVE List V5
Vulnerability Description
FreeRDP 3.17.1 before 3.32.0 contains a heap buffer over-read vulnerability in DynvcTrackerHandleCreateBack of the freerdp-proxy DRDYNVC channel handler that allows malicious backend RDP servers to read heap memory out of bounds. Attackers can send a CREATE_REQUEST_PDU whose channel name lacks a NUL byte, causing an unbounded snprintf read that leaks memory into proxy logs or crashes the process.
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:L
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5
Affected Products
II. Public POCs for CVE-2026-109951
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Vendor Advisories for CVE-2026-109951 (2)
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-2026-109943 | 6.5 MEDIUM | FreeRDP 3.29.0 before 3.32.0 Double Free via Async-Update Polygon 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-2026-109940 | 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
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CVE-2026-111381
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V. Comments for CVE-2026-109951
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