CVE-2026-59730 @astrojs/node: Backslash-prefixed paths not recognized as internal by trailing-slash redirect
Attackers can redirect users to external sites via crafted links when trailing slash redirects are enabled in the Astro Node adapter.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-59730?
CVE-2026-59730 is a low-severity vulnerability in withastro astro, published on 27 Jul 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-601
Which versions are affected by CVE-2026-59730?
2 open source packages ship an affected version, including @astrojs/node.
| Package | Affected | Fixed in |
|---|---|---|
@astrojs/node npm | From 8.1.0 | 11.0.2 |
@astrojs/node npm | From 8.1.0 | 11.0.2 |
How do I fix CVE-2026-59730?
Upgrade @astrojs/node to 11.0.2 or later.
Is CVE-2026-59730 being exploited?
There is no known exploitation of CVE-2026-59730 in the wild and no public exploit code.
Sources
Also known as GHSA-r557-wffq-wvrc.