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CVE-2026-68579— FreeRDP before 3.30.0 Heap Overflow via CliprdrStream_Read

Quick assessment

Affected
FreeRDP FreeRDP
Exploitation
Public or AI PoC available; prioritize validation
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 3.30.0之前版本存在安全漏洞，该漏洞源于Windows剪贴板客户端的CliprdrStream_Read函数存在堆缓冲区溢出，在处理OLE粘贴操作时使用服务器提供的长度（req_fsize）而非调用者缓冲区大小（cb）复制数据，可能导致恶意RDP服务器返回过大的CB_FILECONTENTS_RESPONSE，当用户粘贴服务器提供的剪贴板文件内容时造成堆缓冲区越界写入攻击者控制的数据。

CVSS 9.6 · Critical EPSS 0.27% · P19

Affected Version Matrix 2

VendorProduct Version RangeStatus
FreeRDP FreeRDP < 3.30.0 affected
3.30.0 unaffected
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I. Basic Information for CVE-2026-68579

Vulnerability Information
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Vulnerability Title
FreeRDP before 3.30.0 Heap Overflow via CliprdrStream_Read
Source: CVE Program / CVE List V5
Vulnerability Description
FreeRDP before 3.30.0 (<= 3.29.0) contains a heap-based buffer overflow in the Windows clipboard client's CliprdrStream_Read function (client/Windows/wf_cliprdr.c). When an OLE paste consumer (e.g. explorer.exe) calls IStream::Read with a fixed-size buffer of cb bytes, CliprdrStream_Read requests file contents from the RDP server and then copies the response into the caller's buffer using the server-supplied length (req_fsize) instead of cb. A malicious or compromised RDP server can return an oversized CB_FILECONTENTS_RESPONSE, causing an out-of-bounds write of attacker-controlled data into the paste consumer's heap buffer when a user pastes server-offered clipboard file contents.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存写
Source: CVE Program / CVE List V5
Vulnerability Title
FreeRDP 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
FreeRDP是FreeRDP团队开源的一款远程桌面协议(RDP)的实现。 FreeRDP 3.30.0之前版本存在安全漏洞，该漏洞源于Windows剪贴板客户端的CliprdrStream_Read函数存在堆缓冲区溢出，在处理OLE粘贴操作时使用服务器提供的长度（req_fsize）而非调用者缓冲区大小（cb）复制数据，可能导致恶意RDP服务器返回过大的CB_FILECONTENTS_RESPONSE，当用户粘贴服务器提供的剪贴板文件内容时造成堆缓冲区越界写入攻击者控制的数据。
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 0 ~ 3.30.0 -

II. Public POCs for CVE-2026-68579

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 11064 chars
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III. Intelligence Information for CVE-2026-68579

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Patches & Fixes for CVE-2026-68579 (1)

Vendor Advisories for CVE-2026-68579 (2)

IV. Related Vulnerabilities

Same product: FreeRDP
Same vendor: FreeRDP
Same weakness: CWE-787

V. Comments for CVE-2026-68579

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