CVE-2026-76840

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

• ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
• AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
• Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.43% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 37.2% of scored records. A rank, not a probability.

NVD base score

8.5 (CVSS v4.0), scored by the NVD independently of the CNA.

NVD 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

NVD analysis status

Deferred. NVD last modified this record on 2026-10-14.

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 13:11Z2 MO AGO

Last updated

2026-10-01 15:21Z27 DAYS 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

a3348f7f6ef4f1ef911b86209f8fd243341bc2fde18ce6a4e7037b88f2472071

• 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-trackingpatch
• github.comGitHub Security Advisory (GHSA-m37j-jcr2-8gcc)https://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