CVE-2026-42566 Meshtastic: Malformed UTF-8 in User.long_name broadcast over LoRa causes mesh-wide client decode failure

Meshtastic is an open source mesh networking solution. Prior to version 2.7.23.b246bcd, a single node advertising a User.longname 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...