{"id":"CVE-2026-68579","title":"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)","summary":"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 …","severity":"critical","cvss":9.6,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:H/A:H","cwe":["CWE-787"],"vendor":"freerdp","product":"freerdp","affected":["freerdp < 3.30.0"],"patched":["freerdp 3.30.0"],"published":"2026-08-02","updated":"2026-09-29","sourceUpdated":"2026-09-29T16:17:08.470","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-68579","references":[{"url":"https://github.com/FreeRDP/FreeRDP/commit/5e8e987b469b60a3bafadf8f5afc40f91c09f458","label":"disclosure@vulncheck.com"},{"url":"https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-m37j-jcr2-8gcc","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/freerdp-before-heap-overflow-via-cliprdrstream-read","label":"disclosure@vulncheck.com"}],"tags":["nvd"],"epss":0.00479,"epssPercentile":0.41144,"ingestedAt":"2026-08-02T13:18:30.035Z","slug":"CVE-2026-68579","body":"## Overview\n\nFreeRDP 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.\n\n## Affected\n\n- `freerdp < 3.30.0`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `freerdp 3.30.0`","depth":"midnight","depthScore":53,"depthScoreParts":{"impact":52.8,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}