CVE-2026-26453

High severity, CVSS 7.5. EPSS: 0.5% chance of exploitation in the next 30 days.

ccoap 77f55c4b466e99327c24ace8a2913d3ba7e2ccd5 contains a null pointer dereference vulnerability in the coap_server_handle_session() function when processing COAP messages containing URI_PATH options with NULL data pointers. When the server searches for a URI_PATH option matching the string "separate", it directly calls strncmp() on option_list[i].data without checking if the pointer is NULL. This causes a segmentation fault when the option's data field is NULL.

Published 2026-08-27. Last modified 2026-09-01.