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Vulnerability record · CVE-2026-26453 · published 27 August 2026

CVE-2026-26453: NULL pointer dereference vulnerability

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.

7.5 CVSS 3.1 High EPSS 0.49% · top 60.5% CWE-476 · NULL pointer dereference Deferred
7.5CVSS 3.1 base score
0.49%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
3References
1 Sep 2026Last modified by NVD

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:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

LinkTags
https://github.com/ipflavors/ccoap
https://github.com/songxpu/bug_report/blob/master/CoAP/ccoap/VULNERABILITY_REPORT3.md
https://github.com/songxpu/bug_report/blob/master/CoAP/ccoap/VULNERABILITY_REPORT3.md

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

6.2CVE-2026-21525Windows Remote Access Connection Manager null pointer dereference DoSWindows Remote Access Connection Manager contains a null pointer dereference (CWE-476) that lets an unauthorized attacker deny service locally. The f…KEVEPSS 4.8%analysed

Source: NIST National Vulnerability Database (record CVE-2026-26453), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.