What is CVE-2026-42566?

CVE-2026-42566 is a high-severity vulnerability in Meshtastic Firmware, classified under Improper Input Validation. CVSS score: 7.5/10. Published 2026-07-20.

How severe is CVE-2026-42566?

High severity. CVSS v3 base score is 7.5 out of 10.

Improper input validation in Meshtastic Firmware

CVE-2026-42566

Meshtastic is an open source mesh networking solution. Prior to version 2.7.23.b246bcd, a single node advertising a User.long_name that contains a malformed character encoding can render other radios unusable over BLE when managed through…

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

EPSS: 0.003 (19.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Meshtastic Firmware — versions < 2.7.23.b246bcd

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

security-advisories@github.com (x_refsource_CONFIRM)
security-advisories@github.com (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-42566?: CVE-2026-42566 is a high-severity vulnerability in Meshtastic Firmware, classified under Improper Input Validation. CVSS score: 7.5/10. Published 2026-07-20.
How severe is CVE-2026-42566?: High severity. CVSS v3 base score is 7.5 out of 10.