CVE-2026-76840
RustDesk Windows clipboard overflow allows heap corruption via crafted remote paste
Is CVE-2026-76840 being exploited?
Not confirmed. CVE-2026-76840 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.30% probability of exploitation in the next 30 days.
How severe is CVE-2026-76840?
CVE-2026-76840 is rated High with a CVSS score of 8.5. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-76840?
Yes. A fix has been recorded for CVE-2026-76840. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-76840 affect?
CVE-2026-76840 affects RustDesk (Windows client), OLE paste consumers (e.g., explorer.exe), Related FreeRDP code (see CVE-2026-68579). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-76840?
Disable clipboard/file redirection; block untrusted peers; apply vendor patch when available.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Heap overflow during remote clipboard paste lets a malicious peer write past heap, enabling remote code execution or crash when user pastes.
Immediate action required
- affected<= 1.4.9
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.