{"id":"CVE-2026-59730","aliases":["GHSA-r557-wffq-wvrc"],"url":"https://o3.security/vulnerability/CVE-2026-59730","summary":"@astrojs/node: Backslash-prefixed paths not recognized as internal by trailing-slash redirect","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.","published":"2026-07-27T20:00:28.662Z","modified":"2026-08-12T03:51:42.768560556Z","cvss":null,"epss":{"score":0.00359,"percentile":0.28849,"asOf":"2026-09-05"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"@astrojs/node","fixedVersion":"11.0.2"}],"fix":{"url":"https://github.com/withastro/astro/commit/eb6f97e391ee587747e37609c255c7cd4b9cce3c","label":"withastro/astro@eb6f97e"},"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"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:42.768560556Z"}}