{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "snapshot/2026-05-26"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "a83f1ca28fa090fbc03c3669fef40daf4f89cd03"
            }
          ],
          "repo": "https://github.com/eclipse-wakaama/wakaama",
          "type": "GIT"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "VulnCheck",
    "cwe_ids": [
      "CWE-770"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/58xxx/CVE-2026-58465.json"
  },
  "details": "Eclipse Wakaama before snapshot/2026-05-26 contains an unbounded memory allocation vulnerability in the CoAP Block1 handler within coap/block.c that allows unauthenticated remote attackers to exhaust server memory by sending a sequence of Block1 PUT requests with incrementing block numbers. Attackers can target the registration endpoint over UDP without authentication, causing the server to repeatedly reallocate a growing accumulation buffer by appending each block payload without enforcing any maximum total size limit, resulting in denial of service through memory exhaustion.",
  "id": "CVE-2026-58465",
  "modified": "2026-07-16T03:30:59.830464844Z",
  "published": "2026-07-02T17:55:12.038Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/58xxx/CVE-2026-58465.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/eclipse-wakaama/wakaama/releases/tag/snapshots%2F2026-05-26"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-58465"
    },
    {
      "type": "ADVISORY",
      "url": "https://www.vulncheck.com/advisories/eclipse-wakaama-coap-block1-handler-unbounded-memory-allocation-dos"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/eclipse-wakaama/wakaama/pull/881"
    },
    {
      "type": "FIX",
      "url": "https://github.com/eclipse-wakaama/wakaama/commit/a83f1ca28fa090fbc03c3669fef40daf4f89cd03"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/eclipse-wakaama/wakaama"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Eclipse Wakaama CoAP Block1 Handler Unbounded Memory Allocation DoS"
}