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CVE-2026-91963— FreeRDP 2.0.0 through 3.30.0 Uninitialized Heap Memory Disclosure 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是FreeRDP团队开源的一款远程桌面协议(RDP)的实现。 FreeRDP 3.31.0之前版本存在异常处理不当漏洞，该漏洞源于urbdrc USB重定向通道存在未初始化堆内存泄露，恶意RDP服务器可诱导USB传输失败以读取客户端未初始化的堆内存，绕过ASLR，结合内存损坏漏洞可能导致远程代码执行。

CVSS 6.5 · Medium EPSS 0.66% · P52 Updated Sep 16, 2026

Possible ATT&CK Techniques 2 AI

T1190 · Exploit Public-Facing Application T1210 · Exploitation of Remote Services

Affected Version Matrix 5

Vendor	Product	Version Range	Status
FreeRDP	FreeRDP	`2.0.0< 3.0.0`	affected
		`3.0.0< 3.31.0`	affected
		`3.31.0`	unaffected
		`< 3.31.0`	affected
		`3.31.0`	unaffected

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I. Basic Information for CVE-2026-91963

Vulnerability Information

Have questions about the vulnerability? See if Shenlong's analysis helps!

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Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title

FreeRDP 2.0.0 through 3.30.0 Uninitialized Heap Memory Disclosure via urbdrc

Source: CVE Program / CVE List V5

Vulnerability Description

FreeRDP versions before 3.31.0 contain an uninitialized heap memory disclosure vulnerability in the urbdrc USB redirection channel. A malicious RDP server can induce failing USB transfers to read uninitialized heap memory from the client, defeating ASLR and enabling remote code execution when chained with memory corruption vulnerabilities.

Source: CVE Program / CVE List V5

CVSS Information

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

Source: CVE Program / CVE List V5

Vulnerability Type

使用未经初始化的变量

Source: CVE Program / CVE List V5

Vulnerability Title

FreeRDP 异常处理不当漏洞

Source: CNNVD (China National Vulnerability Database)

Vulnerability Description

Source: CNNVD (China National Vulnerability Database)

CVSS Information

N/A

Source: CNNVD (China National Vulnerability Database)

Vulnerability Type

N/A

Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
FreeRDP	FreeRDP	2.0.0 ~ 3.0.0	-
FreeRDP	FreeRDP	0 ~ 3.31.0	-

II. Public POCs for CVE-2026-91963

#	POC Description	Source Link	Shenlong Link

AI-Generated POC Premium

No public POC found.

III. Intelligence Information for CVE-2026-91963

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Vendor Advisories for CVE-2026-91963 (2)

https://www.cve.org/CVERecord?id=CVE-2026-91963

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-2026-91961	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-2026-91951	6.5 MEDIUM	FreeRDP 3.14.0 through 3.30.0 Out-of-bounds Write via urbdrc
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-457