Vulnerability Description
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.
Related Weaknesses (CWE)
References
- https://github.com/withastro/astro/commit/eb6f97e391ee587747e37609c255c7cd4b9cce
- https://github.com/withastro/astro/pull/17252
- https://github.com/withastro/astro/releases/tag/@astrojs/[email protected]
- https://github.com/withastro/astro/security/advisories/GHSA-r557-wffq-wvrc
FAQ
What is CVE-2026-59730?
CVE-2026-59730 is a documented vulnerability. 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 ...
How severe is CVE-2026-59730?
CVSS scoring is not yet available for CVE-2026-59730. Check NVD for updates.
Is there a patch for CVE-2026-59730?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.