{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "8.1.0"
              },
              {
                "fixed": "11.0.2"
              }
            ],
            "source": "AFFECTED_FIELD"
          },
          "events": [
            {
              "introduced": "9aa5ac10197f08e316a1c4223cfc1fbd5913b3b7"
            },
            {
              "fixed": "a86160ee79e4600bf77f89eb2dc84782acdeab6f"
            }
          ],
          "repo": "https://github.com/withastro/astro",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-r557-wffq-wvrc"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-601"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/59xxx/CVE-2026-59730.json"
  },
  "details": "Astro is a web framework for content-driven websites. In versions 8.1.0 through 11.0.1, when trailingSlash: 'always' is configured, the @astrojs/node standalone server's static file handler appends a trailing slash to request paths and issues a 301 redirect. Paths beginning with /\\ (slash-backslash) were not recognized as internal paths, so the handler would echo the raw path back in the Location header. Because browsers treat \\ as / per the WHATWG URL specification, the resulting redirect could resolve to an external host. Preconditions for exploitation: trailingSlash: 'always' must be set (non-default; the default is 'ignore'), the request path must not have a file extension in its final segment, and an attacker must deliver the crafted link to a user. This issue has been fixed in version 11.0.2.",
  "id": "CVE-2026-59730",
  "modified": "2026-07-29T03:30:27.777334730Z",
  "published": "2026-07-27T20:00:28.662Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/withastro/astro/releases/tag/@astrojs/node@11.0.2"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/59xxx/CVE-2026-59730.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/withastro/astro/security/advisories/GHSA-r557-wffq-wvrc"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-59730"
    },
    {
      "type": "FIX",
      "url": "https://github.com/withastro/astro/commit/eb6f97e391ee587747e37609c255c7cd4b9cce3c"
    },
    {
      "type": "FIX",
      "url": "https://github.com/withastro/astro/pull/17252"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "@astrojs/node: Backslash-prefixed paths not recognized as internal by trailing-slash redirect"
}