{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "12.0.0"
              },
              {
                "last_affected": "13.14.2"
              },
              {
                "introduced": "2023.9.0-beta.1"
              },
              {
                "fixed": "2026.7.0"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "781cebf19406c9db4c769f35a78c991326393b98"
            },
            {
              "introduced": "2939e8131d303f27ef24541fa8394369401be08b"
            },
            {
              "fixed": "a12ee2e5d72c40252e11a164b2231667c9697667"
            },
            {
              "fixed": "8ea4a0ecac058688f69706ab88de1fcd439e2621"
            }
          ],
          "repo": "https://github.com/misskey-dev/misskey",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-4x7v-qx8f-g3p8"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-405",
      "CWE-770",
      "CWE-918"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/104xxx/CVE-2026-104817.json"
  },
  "details": "Misskey is an open source, federated social media platform. From 12.112.1 until 2026.7.0, the unauthenticated fetch-rss API lacks rate limiting and response-size restrictions and performs synchronous XML parsing. An attacker can trigger unbounded outbound HTTP requests and synchronous parsing, exhausting instance resources, amplifying requests toward third-party servers, or probing network-reachable services even when federation is disabled. This issue is fixed in version 2026.7.0.",
  "id": "CVE-2026-104817",
  "modified": "2026-10-15T02:30:25.798260917Z",
  "published": "2026-10-13T18:39:30.169Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/misskey-dev/misskey/releases/tag/2026.7.0"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/104xxx/CVE-2026-104817.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/misskey-dev/misskey/security/advisories/GHSA-4x7v-qx8f-g3p8"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-104817"
    },
    {
      "type": "FIX",
      "url": "https://github.com/misskey-dev/misskey/commit/a12ee2e5d72c40252e11a164b2231667c9697667"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:L/SI:N/SA:L",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Misskey: Lack of rate limiting and size restrictions in RSS fetching API"
}