Security advisory

{
  "id": "27d3d54b98d4735a5e58c42f1b2bf39be335603f8709b379de5112f337fc43cd",
  "url": "https://osv.dev/vulnerability/CVE-2026-26457",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2026-26457",
    "summary": "ccoap 77f55c4b466e99327c24ace8a2913d3ba7e2ccd5 contains a null pointer dereference vulnerability in the coap_dump_msg() function when processing COAP messages containing options with zero length.",
    "evidence": "osv:CVE-2026-26457",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-26457",
      "aliases": [
        "CVE-2026-26457"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/ipflavors/ccoap",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "77f55c4b466e99327c24ace8a2913d3ba7e2ccd5"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "77f55c4b466e99327c24ace8a2913d3ba7e2ccd5"
                      }
                    ],
                    "source": "DESCRIPTION"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v1.1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-26457.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:26.652931607Z",
      "provider": "osv",
      "references": [
        "https://github.com/songxpu/bug_report/blob/master/CoAP/ccoap/VULNERABILITY_REPORT2.md",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/26xxx/CVE-2026-26457.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-26457",
        "https://github.com/ipflavors/ccoap"
      ],
      "provider_metadata": {
        "cna_assigner": "mitre",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/26xxx/CVE-2026-26457.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-26457",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 493283,
  "published_at": "2026-08-27T00:00:00+00:00"
}