What is CVE-2026-109390?

CVE-2026-109390 is a critical-severity vulnerability in Anydesk, classified under Improper Handling of Length Parameter Inconsistency. CVSS score: 9.8/10. Published 2026-10-12.

How severe is CVE-2026-109390?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Vulnerability in Anydesk

CVE-2026-109390

AnyDesk before 8.0.3 allows unauthenticated remote attackers to execute arbitrary code via a heap-based buffer overflow, as demonstrated on Linux for command execution as root without the victim approving desktop control. In the stream packet handler for mode 5 in the session protocol, a payload length value is not validated.

Published 2026-10-12.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Anydesk

Weakness classification (CWE)

CWE-130 — Improper Handling of Length Parameter Inconsistency

References

Frequently asked questions

What is CVE-2026-109390?: CVE-2026-109390 is a critical-severity vulnerability in Anydesk, classified under Improper Handling of Length Parameter Inconsistency. CVSS score: 9.8/10. Published 2026-10-12.
How severe is CVE-2026-109390?: Critical severity. CVSS v3 base score is 9.8 out of 10.