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CVE-2026-91951— FreeRDP 3.14.0 through 3.30.0 Out-of-bounds Write via urbdrc

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 3.31.0 之前的版本中，在 urbdrc 客户端通道的 函数中存在一个越界写入（out-of-bounds write）漏洞。恶意的 RDP 服务器可以发送一个经过构造的 28 字节 USB 重定向消息，从而触发对已分配的 16 字节缓冲区之外进行 4 字节的写入。当启用了详细断言（verbose asserts）时，这将导致服务拒绝（DoS）状态。

CVSS 6.5 · Medium

Possible ATT&CK Techniques 1 AI

T1029 · Scheduled Transfer
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I. Basic Information for CVE-2026-91951

Vulnerability Information
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Vulnerability Title
FreeRDP 3.14.0 through 3.30.0 Out-of-bounds Write via urbdrc
Source: CVE Program / CVE List V5
Vulnerability Description
FreeRDP versions before 3.31.0 contain an out-of-bounds write vulnerability in the urbdrc client channel's urb_send_current_frame_number_result() function. A malicious RDP server can send a crafted 28-byte USB redirection message to trigger a 4-byte write past the allocated 16-byte buffer, causing denial of service when verbose asserts are 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
可达断言
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
FreeRDP FreeRDP 3.14.0 ~ 3.31.0 -

II. Public POCs for CVE-2026-91951

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III. Intelligence Information for CVE-2026-91951

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Vendor Advisories for CVE-2026-91951 (2)

Same Patch Batch · FreeRDP · 2026-09-15 · 20 CVEs total

CVE-2026-91949 9.3 CRITICAL FreeRDP 3.0.0 through 3.30.0 Protocol Negotiation Bypass
CVE-2026-91964 8.8 HIGH FreeRDP 2.0.0 through 3.30.0 Heap Buffer Overflow via RoutingToken
CVE-2026-91948 7.5 HIGH FreeRDP before 3.31.0 Out-of-bounds Write via SHOW_PROTOCOL
CVE-2026-91947 7.5 HIGH FreeRDP Server before 3.31.0 Use-After-Free via DRDYNVC
CVE-2026-91955 7.5 HIGH FreeRDP before 3.31.0 Denial of Service via Desktop Dimensions
CVE-2026-91958 6.6 MEDIUM FreeRDP 3.11.0 through 3.30.0 Heap Buffer Overflow via Monitor Index
CVE-2026-91960 6.5 MEDIUM FreeRDP before 3.31.0 Integer Overflow Double Free
CVE-2026-91945 6.5 MEDIUM FreeRDP before 3.31.0 Out-of-bounds Read via Smartcard ATR
CVE-2026-91952 6.5 MEDIUM FreeRDP before 3.31.0 Denial of Service via pool_decode_rect
CVE-2026-91959 6.5 MEDIUM FreeRDP before 3.31.0 Buffer Over-read via RTS Gateway
CVE-2026-91954 6.5 MEDIUM FreeRDP before 3.31.0 NULL Pointer Dereference via NSCodec
CVE-2026-91963 6.5 MEDIUM FreeRDP 2.0.0 through 3.30.0 Uninitialized Heap Memory Disclosure via urbdrc
CVE-2026-91961 6.5 MEDIUM FreeRDP before 3.31.0 Denial of Service via URBDRC
CVE-2026-91953 6.5 MEDIUM FreeRDP before 3.31.0 Heap Buffer Overflow via LB_LOAD_BALANCE_INFO
CVE-2026-91950 6.5 MEDIUM FreeRDP before 3.31.0 Out-of-Bounds Read via UINT32 Wraparound
CVE-2026-91946 6.5 MEDIUM FreeRDP before 3.31.0 Information Disclosure via RDPGFX ResetGraphics
CVE-2026-91956 6.5 MEDIUM FreeRDP before 3.31.0 Out-of-Bounds Read via URBDRC
CVE-2026-91962 6.3 MEDIUM FreeRDP before 3.31.0 Integer Overflow via audin Apple backends
CVE-2026-91957 3.1 LOW FreeRDP before 3.31.0 Use-After-Free via smartcard worker

IV. Related Vulnerabilities

Same product: FreeRDP
Same vendor: FreeRDP
Same weakness: CWE-617

V. Comments for CVE-2026-91951

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