CVE-2026-26453: n/a
Description
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.
CVSS v3.1
Score 7.5high
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability in ccoap (commit 77f55c4b466e99327c24ace8a2913d3ba7e2ccd5) arises from a null pointer dereference in the coap_server_handle_session() function. When processing COAP messages, the function iterates over URI_PATH options and calls strncmp() to compare option data against the string "separate". However, it does not check if the option's data pointer is NULL before this call. If a NULL data pointer is encountered, the strncmp() call causes a segmentation fault, resulting in a denial of service condition. This is classified under CWE-476 (NULL Pointer Dereference).
Potential Impact
Successful exploitation causes a denial of service by crashing the server process handling COAP sessions. There is no indication of confidentiality or integrity impact. The vulnerability can be triggered remotely without authentication, increasing its risk. No known exploits are reported in the wild.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, consider applying input validation or filtering to prevent COAP messages with NULL URI_PATH option data from reaching the vulnerable function.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mitre
- Date Reserved
- 2026-02-16T00:00:00.000Z
- State
- PUBLISHED
Threat ID: 6a906ba6acd9273b498399e9
Added to database: 08/27/2026, 16:53:58 UTC
Last enriched: 09/07/2026, 14:22:29 UTC
Last updated: 10/10/2026, 18:48:18 UTC
Views: 29
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