{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "3.17.3"
              }
            ],
            "source": "AFFECTED_FIELD"
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "bbde91a679728f94c4492ebc3683f4fa3309049f"
            }
          ],
          "repo": "https://github.com/ohler55/oj",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-3m6q-jj5j-38c9"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-125",
      "CWE-787"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54592.json"
  },
  "details": "Oj (Optimized JSON) is a JSON parser and Object marshaller packaged as a Ruby gem. In versions prior to 3.17.3, Oj::Doc#each_child, when invoked recursively over a deeply nested JSON document, overflows a fixed-size stack buffer and aborts the process, leading to DoS.  In a two-step chain in ext/oj/fast.c, doc_each_child increments doc-\u003ewhere past the where_path[MAX_STACK = 100] array with no bounds check and never restores it (the doc-\u003ewhere-- is missing), so calling each_child recursively from inside the yield block drives doc-\u003ewhere beyond the array. On the next entry  the function copies the path into the 800-byte stack-local buffer save_path[MAX_STACK]  using wlen = doc-\u003ewhere - doc-\u003ewhere_path, so when the previous recursive call left doc-\u003ewhere past where_path[100] the wlen exceeds MAX_STACK and  the memcpy overflows save_path on the C stack; because the Oj::Doc parser imposes no JSON nesting-depth limit (relying on a C-stack pressure check), deeply nested attacker input reaches this path. This issue has been fixed in version 3.17.3.",
  "id": "CVE-2026-54592",
  "modified": "2026-08-12T03:51:13.797868843Z",
  "published": "2026-06-30T23:16:24.378Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54592.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/ohler55/oj/security/advisories/GHSA-3m6q-jj5j-38c9"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-54592"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Oj: Stack Buffer Overflow in Oj::Doc#each_child via Deeply Nested Input"
}