CVE-2026-12363 Out-of-bounds write in LoRaWAN fragmented transport from a fragment index of 0

The LoRaWAN Fragmented Data Block Transport service subsys/lorawan/services/fragtransport.c does not validate the fragment counter in a received DATAFRAGMENT command before forwarding it to the configured decoder. In fragtransportpackagecallback the value fragcounter = hdr-fragindexn & 0x3FFF is...