CVE-2025-50518

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.

• CWE-416

• https://github.com/IreneTheITCrowd/blog/blob/main/libcoap-vulnerability.md
• https://github.com/IreneTheITCrowd/blog/issues/1
• https://github.com/obgm/libcoap/issues/1724#issuecomment-3199631257
• https://github.com/obgm/libcoap/issues/1724#issuecomment-3234613482

Published

Aug 14, 2025

Last Modified

Jun 17, 2026

Status

Deferred

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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