{"id":"CVE-2026-59731","aliases":["GHSA-vj59-8hwv-xxmv"],"url":"https://o3.security/vulnerability/CVE-2026-59731","summary":"Astro 6.4.7 Authorization Bypass via Decode Iteration Limit and Rewrite Path Canonicalization Mismatch","details":"Astro is a web framework for content-driven websites. Version 6.4.7 performs authorization decisions on a partially decoded pathname after reaching the iterative URL decoder limit, while later rewrite route matching performs an additional decodeURI() operation and can resolve the request to a protected route. This issue is fixed in version 6.4.8.","published":"2026-07-08T16:27:18.496Z","modified":"2026-08-12T03:51:26.903267744Z","cvss":{"score":8.2,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N"},"epss":{"score":0.00466,"percentile":0.38249,"asOf":"2026-08-24"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"astro","fixedVersion":"6.4.8"}],"fix":{"url":"https://github.com/withastro/astro/commit/27c80ea92248993e5fce94b2c26d87d611ab6785","label":"withastro/astro@27c80ea"},"references":[{"type":"WEB","url":"https://github.com/withastro/astro/releases/tag/astro@6.4.8"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/59xxx/CVE-2026-59731.json"},{"type":"ADVISORY","url":"https://github.com/withastro/astro/security/advisories/GHSA-vj59-8hwv-xxmv"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-59731"},{"type":"FIX","url":"https://github.com/withastro/astro/commit/27c80ea92248993e5fce94b2c26d87d611ab6785"},{"type":"FIX","url":"https://github.com/withastro/astro/pull/17109"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:26.903267744Z"}}