CVE-2026-121954— FreeRDP before 3.32.2 Heap Out-of-Bounds Write in Planar Codec

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 FreeRDP 3.32.2 之前的版本中，平面编解码器（planar codec）存在堆缓冲区越界写入漏洞。该漏洞源于函数在缓冲区重新分配成功之前，就提交了新的图像尺寸；同时，失败的操作仅被记录日志而未进行有效处理。恶意 RDP 服务器可先发送一个超大的 PDU，随后发送命令，从而破坏客户端堆内存并导致客户端崩溃。

CVSS 6.5 · Medium Updated Nov 05, 2026

Possible ATT&CK Techniques 2 AI

T1068 · Exploitation for Privilege Escalation T1190 · Exploit Public-Facing Application

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Vulnerability Information

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Vulnerability Title

FreeRDP before 3.32.2 Heap Out-of-Bounds Write in Planar Codec

Source: CVE Program / CVE List V5

Vulnerability Description

FreeRDP before 3.32.2 has a heap out-of-bounds write in the planar codec because freerdp_bitmap_planar_context_reset commits new dimensions before buffer reallocation succeeds, and a failed ResetGraphics is only logged. A malicious RDP server can send an oversized ResetGraphics PDU, then a GFX PLANAR command, to corrupt client heap memory and crash the client.

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

跨界内存写

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-2026-121954

#	POC Description	Source Link	Shenlong Link

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III. Intelligence Information for CVE-2026-121954

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Other References for CVE-2026-121954 (2)

https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-fg78-v8j5-8697 vendor-advisory
https://www.vulncheck.com/advisories/freerdp-before-3.32.2-heap-out-of-bounds-write-in-planar-codec third-party-advisory

https://www.cve.org/CVERecord?id=CVE-2026-121954

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

CVE-2026-121952	9.8 CRITICAL	FreeRDP before 3.32.2 Proxy Out-of-Bounds Write via Bitmap Cache v2 Capability
CVE-2026-121953	9.8 CRITICAL	FreeRDP before 3.32.2 Use-After-Free via rdpgfx Dynamic Virtual Channel Close
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-2026-121951	7.5 HIGH	FreeRDP 3.0.0 before 3.32.2 Denial of Service via Slow-Path Input Event
CVE-2026-121955	7.5 HIGH	FreeRDP before 3.32.2 Use-After-Free in Smartcard Emulation ReleaseContext
CVE-2026-121956	7.5 HIGH	FreeRDP before 3.32.2 Double Free in WinPR Kerberos retrieveSomeTgt
CVE-2026-121957	7.5 HIGH	FreeRDP before 3.32.2 Use-After-Free via RDPGFX ResetGraphics Race
CVE-2026-121960	7.5 HIGH	FreeRDP before 3.32.2 Unauthenticated Denial of Service via CredSSP TSRequest
CVE-2026-121964	7.5 HIGH	FreeRDP before 3.32.2 Heap Buffer Overflow via rpc_client_recv_fragment
CVE-2026-121950	6.5 MEDIUM	FreeRDP before 3.32.2 Heap Overflow via RDPGFX CREATE_SURFACE Integer Wrap
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-787