CVE-2026-26456

High severity, CVSS 7.5. EPSS: 0.4% chance of exploitation in the next 30 days.

A null pointer dereference vulnerability exists in the server-side session management logic of ccoap 77f55c4b466e99327c24ace8a2913d3ba7e2ccd5. The issue is caused by a race condition between the request dispatch thread and the session cleanup thread when accessing shared session list nodes without proper synchronization.

Published 2026-08-27. Last modified 2026-09-08.