Copyright © 2012 Red Hat, Inc. All rights reserved. Critical 2026-08-02T12:15:26 FreeRDP: FreeRDP: Arbitrary Code Execution via Heap Overflow in Clipboard Processing 9.6 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H CWE-787

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.

A flaw was found in FreeRDP. A heap-based buffer overflow exists in the Windows clipboard client's `CliprdrStream_Read` function. A malicious or compromised Remote Desktop Protocol (RDP) server can send an oversized clipboard file contents response. When a user pastes this content, it causes an out-of-bounds write into the paste consumer's memory, potentially leading to arbitrary code execution or a denial of service.

This is a Windows specific vulnerability and does not affect Red Hat products. Red Hat Enterprise Linux 10 Not affected freerdp Red Hat Enterprise Linux 6 Not affected freerdp Red Hat Enterprise Linux 7 Not affected freerdp Red Hat Enterprise Linux 8 Not affected freerdp Red Hat Enterprise Linux 9 Not affected freerdp https://www.cve.org/CVERecord?id=CVE-2026-68579 https://nvd.nist.gov/vuln/detail/CVE-2026-68579 https://github.com/FreeRDP/FreeRDP/commit/5e8e987b469b60a3bafadf8f5afc40f91c09f458 https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-m37j-jcr2-8gcc https://www.vulncheck.com/advisories/freerdp-before-heap-overflow-via-cliprdrstream-read