{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "2.2.0"
              },
              {
                "fixed": "2.2.3"
              },
              {
                "introduced": "2.1.0"
              },
              {
                "fixed": "2.1.14"
              },
              {
                "introduced": "2.0.0"
              },
              {
                "fixed": "2.0.18"
              },
              {
                "introduced": "1.10.0"
              },
              {
                "fixed": "1.10.10"
              },
              {
                "introduced": "0"
              },
              {
                "fixed": "1.9.11"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "7c1bc8ab6e7f70c54fde4be3372dcd113f3f7947"
            },
            {
              "introduced": "49bfb3679ceaf3c20e4029033d19aed6f5cd9d0c"
            },
            {
              "introduced": "9568bcde77d3f1df90e2a790f5ff81b5bc787c5d"
            },
            {
              "introduced": "e4277717b0cad40c6282aae3dd14d4016cda45af"
            },
            {
              "introduced": "0"
            },
            {
              "fixed": "8140088d6572fde6442b31902f1648b3afcc6bcd"
            },
            {
              "fixed": "5a5802e75da8e217173709cb15657b975b725c90"
            },
            {
              "fixed": "2af7014cfb1d4293bf886c4d19bccbe709c7ee64"
            },
            {
              "fixed": "5e2cf795090aa9db925160c034a08973bcf0d925"
            },
            {
              "fixed": "d61de18b49be5376385637bafd38c417a30ad255"
            }
          ],
          "repo": "https://github.com/fedify-dev/fedify",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-9rfg-v8g9-9367"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-1289",
      "CWE-180",
      "CWE-347",
      "CWE-436"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42462.json"
  },
  "details": "Fedify is a TypeScript library for building federated server apps powered by ActivityPub. Prior to versions 1.9.11, 1.10.10, 2.0.18, 2.1.14, and 2.2.3, an attacker can make use of JSON-LD features to restructure a JSON-LD document that would change how Fedify interprets it without changing its Linked Data Signature, allowing them to alter a third-party signed activity they have received. Versions 1.9.11, 1.10.10, 2.0.18, 2.1.14, and 2.2.3 fix the issue.",
  "id": "CVE-2026-42462",
  "modified": "2026-07-08T05:37:38.295814395Z",
  "published": "2026-06-10T20:22:35.383Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/fedify-dev/fedify/releases/tag/2.2.3"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42462.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/fedify-dev/fedify/security/advisories/GHSA-9rfg-v8g9-9367"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-42462"
    }
  ],
  "schema_version": "1.7.5",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Fedify has an LD-Signature Bypass via JSON-LD Named-Graph Restructuring"
}