What’s Vulnerable › Vulnerabilities

CVE-2025-64525: Astro: URL manipulation via unsanitized headers leads to path-based middleware protections bypass, potential SSRF/cache-poisoning, CVE-2025-61925 bypass

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.2% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2025-11-13 · updated 2026-10-07
• Weakness: CWE-918

Description

Astro is a web framework. In Astro versions 2.16.0 up to but excluding 5.15.5 which utilizeon-demand rendering, request headers `x-forwarded-proto` and `x-forwarded-port` are insecurely used, without sanitization, to build the URL. This has several consequences, the most important of which are: middleware-based protected route bypass (only via `x-forwarded-proto`), DoS via cache poisoning (if a CDN is present), SSRF (only via `x-forwarded-proto`), URL pollution (potential SXSS, if a CDN is present), and WAF bypass. Version 5.15.5 contains a patch.

Affected products

• withastro astro: from 2.16.0 before 5.15.5 — fixed in 5.15.5

How to fix

Upgrade to a fixed version: withastro astro 5.15.5. Check the vendor advisory for mitigations.

References

• https://github.com/withastro/astro/blob/970ac0f51172e1e6bff4440516a851e725ac3097/packages/astro/src/core/app/node.ts#L121
• https://github.com/withastro/astro/blob/970ac0f51172e1e6bff4440516a851e725ac3097/packages/astro/src/core/app/node.ts#L97
• https://github.com/withastro/astro/commit/dafbb1ba29912099c4faff1440033edc768af8b4
• https://github.com/withastro/astro/security/advisories/GHSA-hr2q-hp5q-x767

Get alerted when CVE-2025-64525 or the next vulnerability affects your stack