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CVE-2026-121958— FreeRDP through 3.32.1 Heap Out-of-Bounds Write via RDPGFX HashTable_GetKeys

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 3.32.1 及更早版本在 RDPGFX 客户端中存在堆越界写入漏洞。该漏洞源于 回调函数将表面哈希键截断为 16 位，导致表面表状态不一致，进而使得 函数在写入时超出其已分配键数组的边界。恶意的 RDP 服务器或实施中间人攻击的攻击者可通过创建表面 ID 为 0xFFFF、关闭 RDPGFX 通道、重复发送 DELETESURFACE 协议数据单元（PDU），随后发送 ENDFRAME 或 RESETGRAPHICS 来利用此漏洞。

CVSS 8.8 · High

Affected Version Matrix 1

VendorProduct Version RangeStatus
FreeRDP FreeRDP ≤ 3.32.1 affected
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I. Basic Information for CVE-2026-121958

Vulnerability Information
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Vulnerability Title
FreeRDP through 3.32.1 Heap Out-of-Bounds Write via RDPGFX HashTable_GetKeys
Source: CVE Program / CVE List V5
Vulnerability Description
FreeRDP through 3.32.1 has a heap out-of-bounds write in the RDPGFX client because the delete_surface callback truncates surface hash keys to 16 bits, leaving the surface table inconsistent so HashTable_GetKeys writes past its allocated key array. A malicious or man-in-the-middle RDP server can exploit this by creating surfaceId 0xFFFF, closing the RDPGFX channel, sending repeated DELETESURFACE PDUs, and then sending ENDFRAME or RESETGRAPHICS.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/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 ~ 3.32.1 -

II. Public POCs for CVE-2026-121958

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III. Intelligence Information for CVE-2026-121958

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Other References for CVE-2026-121958 (2)

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-2026-121962 8.1 HIGH FreeRDP before 3.32.2 Heap Buffer Overflow via Early User Authorization Read
CVE-2026-121964 7.5 HIGH FreeRDP before 3.32.2 Heap Buffer Overflow via rpc_client_recv_fragment
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