{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "1.5.17"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "54ec431fc5255ff42c36420d88549477e0b33d89"
            }
          ],
          "repo": "https://github.com/maximhq/bifrost",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-w98g-5w9p-p3rc"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-918"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55245.json"
  },
  "details": "Bifrost is an enterprise AI gateway for routing requests to model providers. Prior to 1.5.17, the isPublicIP function in core/providers/utils/fetch.go, reached through FetchAndEncodeURL for Bedrock and Vertex image or document URLs, classifies Carrier-Grade NAT 100.64.0.0/10, IPv6 6to4 2002::/16, NAT64 64:ff9b::/96 and 64:ff9b:1::/48, and deprecated IPv6 site-local fec0::/10 addresses as public. A remote attacker who controls a multimodal request URL can make the gateway fetch internal services, including a cloud instance metadata endpoint encoded through 6to4 or NAT64. This issue is fixed in version 1.5.17.",
  "id": "CVE-2026-55245",
  "modified": "2026-09-11T03:30:39.062037371Z",
  "published": "2026-08-28T18:24:16.723Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/maximhq/bifrost/releases/tag/core/v1.5.17"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55245.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/maximhq/bifrost/security/advisories/GHSA-w98g-5w9p-p3rc"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-55245"
    },
    {
      "type": "FIX",
      "url": "https://github.com/maximhq/bifrost/commit/54ec431fc5255ff42c36420d88549477e0b33d89"
    },
    {
      "type": "FIX",
      "url": "https://github.com/maximhq/bifrost/pull/4092"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Bifrost: SSRF deny-list incomplete: isPublicIP permits CGNAT, IPv6 6to4/NAT64, and site-local in FetchAndEncodeURL"
}