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ruby-oj — security advisory

Type: advisorySources: OSVAdvisory ID: DEBIAN-CVE-2026-54592

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->where past the where_path[MAX_STACK = 100] array with no bounds check and never restores it (the doc->where-- is missing), so calling each_child recursively from inside the yield block drives doc->where 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->where - doc->where_path, so when the previous recursive call left doc->where 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.

Products
ruby-oj
Affected versions
3.14.2-1, 3.16.12-1, 3.16.15-1, 3.16.16-1, 3.16.3-1, 3.17.0-1, 3.17.1-1
Fixed versions
3.14.2-1+deb12u1, 3.16.3-1+deb13u1, 3.17.3-1
CVEs
CVE-2026-54592
Confirmed fixed CVEs
Not specified
Updated in this feed
1 Nov 2026, 12:22 UTC · Revision 2

Source evidence

DEBIAN-CVE-2026-54592

core-osv · Original source

Published 1 Jul 2026, 00:16 UTC

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->where past the where_path[MAX_STACK = 100] array with no bounds check and never restores it (the doc->where-- is missing), so calling each_child recursively from inside the yield block drives doc->where 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->where - doc->where_path, so when the previous recursive call left doc->where 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.

osv:DEBIAN-CVE-2026-54592

ruby-oj

Fixed versions: 3.14.2-1+deb12u1

ruby-oj

Fixed versions: 3.16.3-1+deb13u1

ruby-oj

Fixed versions: 3.17.3-1

Complete source record
{
  "id": "3adb0140d6aaaf3ba25b13075ccbf0ba2fce92f0273fd74624c1aa2f293eaf1b",
  "url": "https://osv.dev/vulnerability/DEBIAN-CVE-2026-54592",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "DEBIAN-CVE-2026-54592",
    "summary": "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->where past the where_path[MAX_STACK = 100] array with no bounds check and never restores it (the doc->where-- is missing), so calling each_child recursively from inside the yield block drives doc->where 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->where - doc->where_path, so when the previous recursive call left doc->where 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.",
    "evidence": "osv:DEBIAN-CVE-2026-54592",
    "products": [
      {
        "name": {
          "value": "ruby-oj",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "3.14.2-1+deb12u1",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": [
          {
            "value": "3.14.2-1",
            "evidence": "/affected/0/versions"
          }
        ]
      },
      {
        "name": {
          "value": "ruby-oj",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "3.16.3-1+deb13u1",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": [
          {
            "value": "3.16.3-1",
            "evidence": "/affected/1/versions"
          }
        ]
      },
      {
        "name": {
          "value": "ruby-oj",
          "evidence": "/affected/2/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "3.17.3-1",
            "evidence": "/affected/2/ranges"
          }
        ],
        "affected_versions": [
          {
            "value": "3.16.12-1",
            "evidence": "/affected/2/versions"
          },
          {
            "value": "3.16.15-1",
            "evidence": "/affected/2/versions"
          },
          {
            "value": "3.16.16-1",
            "evidence": "/affected/2/versions"
          },
          {
            "value": "3.16.3-1",
            "evidence": "/affected/2/versions"
          },
          {
            "value": "3.17.0-1",
            "evidence": "/affected/2/versions"
          },
          {
            "value": "3.17.1-1",
            "evidence": "/affected/2/versions"
          }
        ]
      }
    ],
    "severity": "high",
    "structured": {
      "id": "DEBIAN-CVE-2026-54592",
      "aliases": [
        "DEBIAN-CVE-2026-54592"
      ],
      "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": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "3.14.2-1+deb12u1"
                }
              ]
            }
          ],
          "package": {
            "name": "ruby-oj",
            "purl": "pkg:deb/debian/ruby-oj?arch=source&distro=bookworm",
            "ecosystem": "Debian:12"
          },
          "versions": [
            "3.14.2-1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-54592.json"
          },
          "ecosystem_specific": {
            "urgency": "not yet assigned"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "3.16.3-1+deb13u1"
                }
              ]
            }
          ],
          "package": {
            "name": "ruby-oj",
            "purl": "pkg:deb/debian/ruby-oj?arch=source&distro=trixie",
            "ecosystem": "Debian:13"
          },
          "versions": [
            "3.16.3-1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-54592.json"
          },
          "ecosystem_specific": {
            "urgency": "not yet assigned"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "3.17.3-1"
                }
              ]
            }
          ],
          "package": {
            "name": "ruby-oj",
            "purl": "pkg:deb/debian/ruby-oj?arch=source&distro=forky",
            "ecosystem": "Debian:14"
          },
          "versions": [
            "3.16.12-1",
            "3.16.15-1",
            "3.16.16-1",
            "3.16.3-1",
            "3.17.0-1",
            "3.17.1-1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-54592.json"
          },
          "ecosystem_specific": {
            "urgency": "not yet assigned"
          }
        }
      ],
      "modified": "2026-10-26T11:47:37.326567563Z",
      "provider": "osv",
      "upstream": [
        "CVE-2026-54592"
      ],
      "references": [
        "https://security-tracker.debian.org/tracker/CVE-2026-54592"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2026-54592",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 450913,
  "published_at": "2026-07-01T00:16:32.743+00:00"
}