CVE-2026-42566Network attack vector

BLE management loss via malformed node name

Published Jul 19, 2026 · Updated Jul 19, 2026

Improper input validation in Meshtastic Firmware before 2.7.23.b246bcd allows remote attackers to interrupt BLE management. Firmware string-copy paths can null-terminate User.long_name inside a multibyte UTF-8 sequence and propagate the malformed value, which the iOS app rejects while decoding the node database. Any mesh node can trigger the fail/retry loop without authentication; the radio remains uncontrollable through iOS BLE until the entry ages out or is removed through another management path.

CVSS severity7.5
High
EPSS probability0.49%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in Meshtastic Firmware before 2.7.23.b246bcd allows remote attackers to interrupt BLE management. Firmware string-copy paths can null-terminate User.long_name inside a multibyte UTF-8 sequence and propagate the malformed value, which the iOS app rejects while decoding the node database. Any mesh node can trigger the fail/retry loop without authentication; the radio remains uncontrollable through iOS BLE until the entry ages out or is removed through another management path.

The record

CVE
CVE-2026-42566
Published
Jul 19, 2026
Updated
Jul 19, 2026
Vendor
Meshtastic
Product
Meshtastic Firmware
Classifications
CWE-20, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 19, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 2.7.23.b246bcd

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Meshtastic · Meshtastic Firmwareversion=< 2.7.23.b246bcd

Published CVSS scores

7.5GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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