CVE-2026-26453

Unknown

Published: 27/08/2026(UTC)Translated: 27/08/2026(UTC)NVD NIST

Summary

ccoap (commit 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.

Risk Assessment

A remote attacker can send a specially crafted COAP message, causing a server crash (DoS) and potentially disrupting services.

Recommendation

Update ccoap to a patched version or apply filtering of COAP messages with malformed URI_PATH options.

Original NVD description (English source)

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.