{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "2.8.7"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "45496fcd2ed6e02dcdde0d3839cc5024c091760c"
            },
            {
              "fixed": "58cd1a8893bfe06e4a59a72adc2e7db00a8b9266"
            },
            {
              "fixed": "55915a29017a5090a6ea61e61b0f4d899f032923"
            }
          ],
          "repo": "https://github.com/alam00000/bentopdf",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-5xjf-rr5x-pcfj"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-918"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/77xxx/CVE-2026-77581.json"
  },
  "details": "BentoPDF is a client-side PDF toolkit that is self hostable. In 2.8.6 and earlier, the certificate and timestamp CORS proxy in cloudflare/cors-proxy-worker.js uses isPrivateOrReservedHost() to validate a supplied hostname separately from the DNS resolution used by fetch(targetUrl), allowing an attacker-controlled hostname to resolve to an internal or reserved destination after validation. A certificate-like path can satisfy ALLOWED_PATH_PATTERNS, and direct clients can forge the browser-oriented Origin header. Deployments without PROXY_SECRET skip the optional signature check, while the signature is an anti-abuse measure rather than a destination-security boundary. The proxy has a 10 MB response limit and can relay response bodies from reachable destinations. The advisory identifies both the official Worker deployment and self-hosted instances as impacted where the Worker execution environment can reach internal or reserved destinations. This vulnerability is fixed in 2.8.7.",
  "id": "CVE-2026-77581",
  "modified": "2026-09-26T03:30:25.655676850Z",
  "published": "2026-09-24T15:23:18.550Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/alam00000/bentopdf/releases/tag/v2.8.7"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/77xxx/CVE-2026-77581.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/alam00000/bentopdf/security/advisories/GHSA-5xjf-rr5x-pcfj"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-77581"
    },
    {
      "type": "FIX",
      "url": "https://github.com/alam00000/bentopdf/commit/45496fcd2ed6e02dcdde0d3839cc5024c091760c"
    },
    {
      "type": "FIX",
      "url": "https://github.com/alam00000/bentopdf/commit/58cd1a8893bfe06e4a59a72adc2e7db00a8b9266"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "BentoPDF: SSRF in cors-proxy-worker.js via DNS-based hostname allowlist bypass"
}