CVE-2026-109940— FreeRDP 3.0.0-beta1 before 3.32.0 Stack Buffer Overflow via PKCS#11 Key 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.
在 Unix 平台上构建并启用了 PKCS#11 支持的 FreeRDP 3.0.0-beta1 至 3.32.0 版本中，WinPR 的 NCrypt PKCS#11 提供程序内的 wprintKeyName() 函数存在栈缓冲区溢出漏洞。该函数会将密钥的 CKA_ID（最长可达 64 字节）进行十六进制编码后存入一个固定大小为 128 字节的栈缓冲区中。攻击者可以通过提供恶意的 PKCS#11 令牌或模块，使其密钥及匹配的证书包含 55 至 64 字节的 CKA_ID，从而在密钥枚举过程中触发客户端栈溢出，导致
Possible ATT&CK Techniques 1 AI
T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-109940
Vulnerability Information
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Vulnerability Title
FreeRDP 3.0.0-beta1 before 3.32.0 Stack Buffer Overflow via PKCS#11 Key Name
Source: CVE Program / CVE List V5
Vulnerability Description
FreeRDP 3.0.0-beta1 before 3.32.0 on Unix builds with PKCS#11 support has a stack-based buffer overflow in wprintKeyName() in WinPR's NCrypt PKCS#11 provider. It hex-encodes a key's CKA_ID, which can be up to 64 bytes, into a fixed 128-byte stack buffer. An attacker supplying a malicious PKCS#11 token or module whose key and matching certificate use a 55- to 64-byte CKA_ID can overflow the client's stack during key enumeration, causing a crash.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:P/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
栈缓冲区溢出
Source: CVE Program / CVE List V5
Affected Products
II. Public POCs for CVE-2026-109940
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-109940 (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-2026-109945 | 5.3 MEDIUM | FreeRDP 3.0.0 before 3.32.0 Smartcard Use-After-Free via Concurrent Disconnect and Transmi |
| CVE-2026-109679 | 5.3 MEDIUM | FreeRDP 3.0.0-beta4 before 3.32.0 NULL Pointer Crash via ARM Response |
| CVE-2026-109951 | 5.3 MEDIUM | FreeRDP 3.17.1 before 3.32.0 Heap Buffer Over-Read via Proxy DRDYNVC Channel Name |
| CVE-2026-109948 | 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
-
CVE-2026-109953
FreeRDP 3.0.0 before 3.32.0 Cleartext Credential Disclosure -
CVE-2026-109952
FreeRDP 3.0.0 before 3.32.0 Security Protocol Downgrade via -
CVE-2026-109951
FreeRDP 3.17.1 before 3.32.0 Heap Buffer Over-Read via Proxy -
CVE-2026-109949
FreeRDP 3.0.0 before 3.32.0 PIN Brute-Force via Virtual Smar -
CVE-2026-109950
FreeRDP 3.0.0 before 3.32.0 Heap Out-of-Bounds Read via RD G
Same vendor: FreeRDP
-
CVE-2026-109953
FreeRDP 3.0.0 before 3.32.0 Cleartext Credential Disclosure -
CVE-2026-109952
FreeRDP 3.0.0 before 3.32.0 Security Protocol Downgrade via -
CVE-2026-109951
FreeRDP 3.17.1 before 3.32.0 Heap Buffer Over-Read via Proxy -
CVE-2026-109950
FreeRDP 3.0.0 before 3.32.0 Heap Out-of-Bounds Read via RD G -
CVE-2026-109949
FreeRDP 3.0.0 before 3.32.0 PIN Brute-Force via Virtual Smar
Same weakness: CWE-121
-
CVE-2026-103851
Substance3D - Stager | Stack-based Buffer Overflow (CWE-121) -
CVE-2026-103830
Substance3D - Stager | Stack-based Buffer Overflow (CWE-121) -
CVE-2026-103854
Dimension | Stack-based Buffer Overflow (CWE-121) -
CVE-2026-102199
Microsoft Windows Codecs Library Denial of Service Vulnerabi -
CVE-2026-100216
Windows Storage Elevation of Privilege Vulnerability
V. Comments for CVE-2026-109940
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