{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "12.37.0"
              },
              {
                "fixed": "2026.5.4"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "4ea60d36e5725aad51a1b75ba9ea4fc40db75faa"
            },
            {
              "fixed": "4aa1d9ffc851a7824cb72b84ec01c3f65613463c"
            }
          ],
          "repo": "https://github.com/misskey-dev/misskey",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-38jx-423m-g387"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-367"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/47xxx/CVE-2026-47746.json"
  },
  "details": "Misskey is an open source, federated social media platform. Versions 12.37.0 and later, but prior to 2026.5.4, are vulnerable to timing attacks during JSON-LD signature validation and the compaction process. Because the JSON-LD parsing context is not shared between signature verification and subsequent processing, the application may trust information that should not be trusted, resulting in a time-of-check to time-of-use (TOCTOU) flaw. This allows an attacker to have fraudulent activities accepted as valid, leading to a loss of integrity. This issue has been fixed in version 2026.5.4.",
  "id": "CVE-2026-47746",
  "modified": "2026-08-07T11:31:17.048244740Z",
  "published": "2026-08-03T21:56:40.198Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/misskey-dev/misskey/releases/tag/2026.5.4"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/47xxx/CVE-2026-47746.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/misskey-dev/misskey/security/advisories/GHSA-38jx-423m-g387"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-47746"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Misskey: JSON-LD signature validation + compaction is vulnerable to timing attacks"
}