CVE-2026-42566: Meshtastic is an open source mesh networking solution

Q: How do I fix CVE-2026-42566?

meshtastic firmware: upgrade to newer than 2.7.22. Exact commands for each OS are on this page.

Q: Is CVE-2026-42566 being exploited?

CVE-2026-42566 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-42566 affect?

CVE-2026-42566 affects meshtastic firmware. Severity is high (CVSS 7.5). 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 t

Q: How urgent is CVE-2026-42566?

Priority 42/100. High severity; Remotely exploitable, no login, no user action

This month

HIGH 7.5REMOTEUPGRADE

CVE-2026-42566 is a high-severity flaw (CVSS 7.5) affecting meshtastic firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 the iOS app. The malformed name does not need to be maliciously crafted — it can arise from ordinary buffer truncation and has been observed occurring naturally in the wild. At least one code path could place a

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 59%)
CISA exploited list	No
Weakness	CWE-20
Published	2026-07-20
Last modified	2026-10-24

Publisher (CNA): GitHub, Inc. · Vendor: meshtastic

Last updated 2026-10-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-20 00:16 UTCPublished CVE record published
2026-10-24 20:10 UTCUpdated Record last modified

meshtastic meshtastic firmware UPGRADE

Affected: <= 2.7.22

Fixed in: newer than 2.7.22

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-42566?

meshtastic firmware: upgrade to newer than 2.7.22. Exact commands for each OS are on this page.

Is CVE-2026-42566 being exploited?

CVE-2026-42566 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-42566 affect?

CVE-2026-42566 affects meshtastic firmware. Severity is high (CVSS 7.5). 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 t

How urgent is CVE-2026-42566?

Priority 42/100. High severity; Remotely exploitable, no login, no user action

Software pages

iOS vulnerabilities

References

← Back to latest CVEs