CVE-2026-76840

Exploitation

Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.

SSVC decision

Not assessed by CISA

EPSS probability

Not scored by EPSS

EPSS percentile

Not scored by EPSS

NVD base score

The NVD has published no score for this record

NVD CVSS vector

No NVD score to derive

NVD analysis status

Not recorded

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2026-08-24 13:11Z1 HR AGO

Last updated

2026-08-24 13:11Z1 HR AGO

Reserved

2026-08-19

Assigning CNA

VulnCheck

Record state

PUBLISHED

Severity

High (CVSS 8.5)

CNA CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:L/SI:H/SA:H

Weaknesses

• CWE-20Improper Input ValidationClass
• CWE-787Out-of-bounds WriteBase

Data version

5.2

Document digest

d34d6b3bbbcfbb9b549b4dfcc3bd188b85e6893344bc88267b108354d5f7d4f0

• github.comhttps://github.com/rustdesk/rustdeskproduct
• github.comhttps://github.com/rustdesk/rustdesk/blob/1.4.9/libs/clipboard/src/windows/wf_cliprdr.ctechnical-description
• github.comhttps://github.com/rustdesk/rustdesk/pull/15515issue-tracking
• github.comhttps://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-m37j-jcr2-8gccthird-party-advisory
• www.vulncheck.comVulnCheck Advisory: RustDesk through 1.4.9 Heap Buffer Overflow via Unvalidated CLIPRDR FileContentsResponse Lengthhttps://www.vulncheck.com/advisories/rustdesk-through-heap-buffer-overflow-via-unvalidated-cliprdr-filecontentsresponse-lengththird-party-advisory