CVE-2026-76840
Gravedad CVSS v4.0:
ALTA
Tipo:
CWE-20
Validación incorrecta de entrada
Fecha de publicación:
24/08/2026
Última modificación:
24/08/2026
Descripción
*** Pendiente de traducción *** RustDesk's Windows clipboard redirection copies a peer-supplied length into a fixed-size caller buffer without an upper bound check. When an OLE paste consumer such as explorer.exe calls IStream::Read with a buffer of cb bytes, CliprdrStream_Read in libs/clipboard/src/windows/wf_cliprdr.c requests that many bytes of a remote file through cliprdr_send_request_filecontents and then executes CopyMemory(pv, clipboard->req_fdata, clipboard->req_fsize), where req_fsize is taken verbatim from the peer's CLIPRDR FileContentsResponse by wf_cliprdr_server_file_contents_response (req_fsize = fileContentsResponse->cbRequested) and is never clamped to cb anywhere in the chain. The function's only length comparison, req_fsize
Impacto
Puntuación base 4.0
8.50
Gravedad 4.0
ALTA
Puntuación base 3.x
9.60
Gravedad 3.x
CRÍTICA
Referencias a soluciones, herramientas e información
- https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-m37j-jcr2-8gcc
- https://github.com/rustdesk/rustdesk
- https://github.com/rustdesk/rustdesk/blob/1.4.9/libs/clipboard/src/windows/wf_cliprdr.c
- https://github.com/rustdesk/rustdesk/pull/15515
- https://www.vulncheck.com/advisories/rustdesk-through-heap-buffer-overflow-via-unvalidated-cliprdr-filecontentsresponse-length