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EUVD-2026-341988

2026-10-07T19:19:24.641369+00:00

EUVD-2026-341988

fkie_cve-2026-59730

2026-10-07T19:19:24.641413+00:00

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.

GHSA-r557-wffq-wvrc — @astrojs/node: Backslash-prefixed paths not recognized as internal by trailing-slash redirect

2026-10-07T19:19:24.641471+00:00

Affected: npm: @astrojs/node

### Impact

With `trailingSlash: 'always'` 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:** - `trailingSlash: 'always'` must be set (non-default; the default is `'ignore'`) - The request path must not have a file extension in its final segment - An attacker must deliver the crafted link to a user

### Patches

Fixed by treating backslash-prefixed paths the same as `//`-prefixed paths in `isInternalPath()`, so they are no longer rewritten with a trailing slash.

### Workarounds

Use the default `trailingSlash: 'ignore'` setting, which does not issue trailing-slash redirects in the static file handler.

### References

- [WHATWG URL spec: backslash normalization](https://url.spec.whatwg.org/#url-parsing)