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CVE-2026-121964— FreeRDP before 3.32.2 Heap Buffer Overflow via rpc_client_recv_fragment

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 在 3.32.2 版本之前存在一个堆缓冲区溢出漏洞，该漏洞位于 RD Gateway RPC 客户端中。问题出在函数上：该函数在将和片段写入持久化 PDU 流时，仅检查了流的总容量，而未检查从当前流位置起剩余的可用容量。攻击者可通过恶意或已被攻陷的 RD Gateway 发送经过精心构造的 RPC 片段，其中篡改了和字段，从而用攻击者控制的数据覆盖客户端堆内存，导致程序崩溃，甚至可能引发任意代码执行。

CVSS 7.5 · High Updated Nov 05, 2026

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 2

Vendor	Product	Version Range	Status
FreeRDP	FreeRDP	`< 3.32.2`	affected
		`3.32.2`	unaffected

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Vulnerability Information

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Vulnerability Title

FreeRDP before 3.32.2 Heap Buffer Overflow via rpc_client_recv_fragment

Source: CVE Program / CVE List V5

Vulnerability Description

FreeRDP before 3.32.2 contains a heap-based buffer overflow in the RD Gateway RPC client, where rpc_client_recv_fragment writes BIND_ACK and ALTER_CONTEXT_RESP fragments into a persistent PDU stream after checking only total capacity rather than remaining capacity from the current stream position. A malicious or compromised RD Gateway can send crafted RPC fragments with manipulated alloc_hint and frag_length values to overwrite client heap memory with attacker-controlled data, causing a crash or potentially arbitrary code execution.

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:H

Source: CVE Program / CVE List V5

Vulnerability Type

堆缓冲区溢出

Source: CVE Program / CVE List V5

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
FreeRDP	FreeRDP	0 ~ 3.32.2	-

II. Public POCs for CVE-2026-121964

#	POC Description	Source Link	Shenlong Link

AI-Generated POC Premium

No public POC found.

III. Intelligence Information for CVE-2026-121964

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Other References for CVE-2026-121964 (2)

https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-q82v-5wjg-6h57 vendor-advisory
https://www.vulncheck.com/advisories/freerdp-before-3.32.2-heap-buffer-overflow-via-rpc-client-recv-fragment third-party-advisory

https://www.cve.org/CVERecord?id=CVE-2026-121964

Same Patch Batch · FreeRDP · 2026-11-04 · 15 CVEs total

CVE-2026-121953	9.8 CRITICAL	FreeRDP before 3.32.2 Use-After-Free via rdpgfx Dynamic Virtual Channel Close
CVE-2026-121952	9.8 CRITICAL	FreeRDP before 3.32.2 Proxy Out-of-Bounds Write via Bitmap Cache v2 Capability
CVE-2026-121958	8.8 HIGH	FreeRDP through 3.32.1 Heap Out-of-Bounds Write via RDPGFX HashTable_GetKeys
CVE-2026-121962	8.1 HIGH	FreeRDP before 3.32.2 Heap Buffer Overflow via Early User Authorization Read
CVE-2026-121957	7.5 HIGH	FreeRDP before 3.32.2 Use-After-Free via RDPGFX ResetGraphics Race
CVE-2026-121955	7.5 HIGH	FreeRDP before 3.32.2 Use-After-Free in Smartcard Emulation ReleaseContext
CVE-2026-121951	7.5 HIGH	FreeRDP 3.0.0 before 3.32.2 Denial of Service via Slow-Path Input Event
CVE-2026-121956	7.5 HIGH	FreeRDP before 3.32.2 Double Free in WinPR Kerberos retrieveSomeTgt
CVE-2026-121960	7.5 HIGH	FreeRDP before 3.32.2 Unauthenticated Denial of Service via CredSSP TSRequest
CVE-2026-121950	6.5 MEDIUM	FreeRDP before 3.32.2 Heap Overflow via RDPGFX CREATE_SURFACE Integer Wrap
CVE-2026-121954	6.5 MEDIUM	FreeRDP before 3.32.2 Heap Out-of-Bounds Write in Planar Codec
CVE-2026-121959	6.5 MEDIUM	FreeRDP before 3.32.2 Infinite Loop via Truncated WebSocket Frame
CVE-2026-121961	5.9 MEDIUM	FreeRDP before 3.32.2 Use-After-Free via DRDYNVC Tracker Race
CVE-2026-121963	5.9 MEDIUM	FreeRDP before 3.32.2 Use-After-Free via Dynamic rdpsnd Channel Close

IV. Related Vulnerabilities

Same product: FreeRDP

Same vendor: FreeRDP

Same weakness: CWE-122