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CVE-2026-109256— FreeRDP 3.10.0 through 3.32.2 Heap Buffer Overflow in WinPR PNG Conversion

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 3.10.0 至 3.32.2 版本中存在一个堆缓冲区溢出漏洞，位于 WinPR 的 回调函数中。该漏洞在 失败后，会向缓冲区写入超出其边界的数据。恶意 RDP 剪贴板对等方可以提供一个较大的 CF_DIB 图像，从而在 PNG 转换过程中触发越界 操作，导致客户端崩溃。

CVSS 5.3 · Medium EPSS 0.26% · P17

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
FreeRDP FreeRDP 3.10.0≤ 3.32.2 affected
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I. Basic Information for CVE-2026-109256

Vulnerability Information
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Vulnerability Title
FreeRDP 3.10.0 through 3.32.2 Heap Buffer Overflow in WinPR PNG Conversion
Source: CVE Program / CVE List V5
Vulnerability Description
FreeRDP 3.10.0 through 3.32.2 contains a heap buffer overflow in the WinPR png_write_data callback that writes past the buffer after a realloc failure. A malicious RDP clipboard peer can supply a large CF_DIB image that triggers out-of-bounds memcpy during PNG conversion, causing a client crash.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/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 3.10.0 ~ 3.32.2 -

II. Public POCs for CVE-2026-109256

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III. Intelligence Information for CVE-2026-109256

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Vendor Advisories for CVE-2026-109256 (2)

Same Patch Batch · FreeRDP · 2026-10-12 · 18 CVEs total

CVE-2026-109242 7.1 HIGH FreeRDP before 3.0.0 and 3.6.0 before 3.32.0 Uninitialized Heap Disclosure via Progressive
CVE-2026-109255 6.8 MEDIUM FreeRDP 3.0.0 before 3.32.0 heap buffer overflow via license_check_stream_length
CVE-2026-109245 6.8 MEDIUM FreeRDP 3.0.0 before 3.32.0 Improper Certificate Validation in freerdp_http_request
CVE-2026-109244 6.6 MEDIUM FreeRDP 2.0.0 before 3.32.0 Insecure Private Key Permissions in winpr-makecert
CVE-2026-109250 6.6 MEDIUM FreeRDP 3.0.0 before 3.32.0 Heap Buffer Overflow via PKCS#11 collect_keys()
CVE-2026-109248 6.5 MEDIUM FreeRDP 3.0.0 before 3.32.0 Heap Out-of-Bounds Read via WinPR Clipboard cFileName
CVE-2026-109246 6.5 MEDIUM FreeRDP before 3.32.0 Shadow Server Divide-by-Zero via Frame Acknowledge PDU
CVE-2026-109257 5.9 MEDIUM FreeRDP before 3.32.0 Double Free via NSCodec plane growth failure
CVE-2026-109254 5.9 MEDIUM FreeRDP 2.1.0 before 3.32.0 Use-After-Free via rdpsnd Disconnect Path
CVE-2026-109249 5.5 MEDIUM FreeRDP 3.0.0 before 3.32.0 Heap Out-of-Bounds Read via Remote Assistance File Parsing
CVE-2026-109251 5.3 MEDIUM FreeRDP before 3.32.0 Out-of-Bounds Write via MS-RDPEGT Video Geometry
CVE-2026-109252 5.3 MEDIUM FreeRDP from 3.9.0 before 3.32.0 RDPEAR NULL Pointer Dereference via KERB_RPC_INTERNAL_NAM
CVE-2026-109253 5.3 MEDIUM FreeRDP 3.9.0 before 3.32.0 RDPEAR NDR Scalar Out-of-Bounds Read
CVE-2026-109243 4.4 MEDIUM FreeRDP 3.0.0 before 3.32.0 Insecure Permissions on Soft-Smartcard Private Key File
CVE-2026-109240 3.1 LOW FreeRDP 3.11.0 before 3.32.1 Reachable Assertion DoS via urb_isoch_transfer
CVE-2026-109241 3.1 LOW FreeRDP before 3.32.0 NULL Dereference in Video Redirection Channel
CVE-2026-109247 3.1 LOW FreeRDP before 3.32.0 Path Traversal via Clipboard cFileName

IV. Related Vulnerabilities

Same product: FreeRDP
Same vendor: FreeRDP
Same weakness: CWE-122

V. Comments for CVE-2026-109256

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