{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "last_affected": "4.14.11"
              }
            ],
            "source": "AFFECTED_FIELD"
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "025b3dacab7dbcf7cadf515dbf78571f786921a4"
            }
          ],
          "repo": "https://github.com/labring/fastgpt",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-cc8x-jrqv-hmwh"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-367"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42344.json"
  },
  "details": "FastGPT is an AI Agent building platform. In versions 4.14.11 and prior, FastGPT's isInternalAddress() function in packages/service/common/system/utils.ts is vulnerable to DNS rebinding (TOCTOU — Time-of-Check to Time-of-Use). The function resolves the hostname via dns.resolve4()/dns.resolve6() and checks resolved IPs against private ranges, but the actual HTTP request happens in a separate call with a new DNS resolution, allowing the DNS record to change between validation and fetch. At time of publication, there are no publicly available patches.",
  "id": "CVE-2026-42344",
  "modified": "2026-07-15T01:49:10.097999609Z",
  "published": "2026-05-08T22:10:00.875Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42344.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/labring/FastGPT/security/advisories/GHSA-cc8x-jrqv-hmwh"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-42344"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "FastGPT: DNS rebinding TOCTOU bypass in isInternalAddress allows SSRF on all protected endpoints"
}