@astrojs/node: Backslash-prefixed paths not recognized as internal by trailing-slash redirect
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
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| npm package | @astrojs/node | >= 8.1.0, < 11.0.2 | 11.0.2 |
References
- https://github.com/withastro/astro/security/advisories/GHSA-r557-wffq-wvrc
- https://nvd.nist.gov/vuln/detail/CVE-2026-59730
- https://github.com/withastro/astro/pull/17252
- https://github.com/withastro/astro/commit/eb6f97e391ee587747e37609c255c7cd4b9cce3c
- https://github.com/withastro/astro
- https://github.com/withastro/astro/releases/tag/@astrojs/node@11.0.2
- CVSS vector
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N- Weakness (CWE)
CWE-601- Platform
- npm
- Package
@astrojs/node- Disclosed
- 20.07.2026
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-r557-wffq-wvrc - CC BY 4.0
Vulnerability history: @astrojs/node
All published vulnerabilities of this package (npm package), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 9
- First → latest
- 08.2025 09.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- High 1
- Medium 7
- Low 1
Disclosures per year
- 2025: 2
- 2026: 7
-
@astrojs/node: Backslash-prefixed paths not recognized as internal by trailing-slash redirect this entry
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