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Medium, CVSS 6.9amended

Astro's middleware authentication checks based on url.pathname can be bypassed via url encoded values

CVE-2025-64765GHSA-ggxq-hp9w-j794

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (astro 5.15.8), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

  • npm astro

    Affected
    < 5.15.8
    Fixed in
    5.15.8

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS 4.0
6.9 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N · score source
EPSS
  • CVE-2025-64765: 0.54% estimated exploitation activity in the next 30 days; percentile 45.38 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

A mismatch exists between how Astro normalizes request paths for routing/rendering and how the application’s middleware reads the path for validation checks. Astro internally applies decodeURI() to determine which route to render, while the middleware uses context.url.pathname without applying the same normalization (decodeURI). This discrepancy may allow attackers to reach protected routes (e.g., /admin) using encoded path variants that pass routing but bypass validation checks. https://github.com/withastro/astro/blob/ebc4b1cde82c76076d5d673b5b70f94be2c066f3/packages/astro/src/vite-plugin-astro-server/request.ts#L40-L44 Consider an application having the following middleware code: context.url.pathname is validated , if it's equal to /admin the isAuthed property must be true for the next() method to be called. The same example can be found in the official docs https://docs.astro.build/en/guides/authentication/ context.url.pathname returns the raw version which is /%61admin while…

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 3 · amended ·

    Amended from ghsa record GHSA-ggxq-hp9w-j794

  2. Revision 2 · amended ·

    Reviewed OSV alias/range/CVSS4 correction; package source scopes and original publication preserved. No customer finding resolved.

  3. Revision 1 · created ·

    Published from osv record GHSA-ggxq-hp9w-j794

Agent brief

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# Patch Next advisory brief: CVE-2025-64765

Advisory: Astro's middleware authentication checks based on url.pathname can be bypassed via url encoded values
IDs: CVE-2025-64765, GHSA-ggxq-hp9w-j794
Record: https://patchnext.com/advisories/cve-2025-64765 (revision 3, source checked 26 Oct 2026, 12:38 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 6.9)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: astro 5.15.8. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm astro: affected < 5.15.8; fixed in 5.15.8

## Suggested inspection (read-only)
- `npm ls astro --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on astro.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-ggxq-hp9w-j794 (OSV record GHSA-ggxq-hp9w-j794 lists affected ranges: npm astro >=0 <5.15.8 (fixed))
- Verified: https://github.com/advisories/GHSA-ggxq-hp9w-j794 (GitHub-reviewed advisory GHSA-ggxq-hp9w-j794 lists affected ranges: npm astro >=0 <5.15.8)

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