CVE-2025-50518

Critical severity, CVSS 9.8. EPSS: 0.4% chance of exploitation in the next 30 days.

A use-after-free vulnerability exists in the coap_delete_pdu_lkd function within coap_pdu.c of the libcoap library. This issue occurs due to improper handling of memory after the freeing of a PDU object, leading to potential memory corruption or the possibility of executing arbitrary code. NOTE: this is disputed by the Supplier because it only occurs when an application uses libcoap incorrectly.

Published 2025-08-14. Last modified 2026-06-17.