CVE-2025-64525

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

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

withastro · astro

CVSS v3.1 GITHUB

6.5 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L

EPSS

1.24% chance of exploitation in the next 30 days, 69th percentile

Nuclei

medium

Published

2025-11-13

Proof-of-concept exploits (1)

• advisories/GHSA-hr2q-hp5q-x767

Nuclei templates (1)

• projectdiscovery/nuclei-templates/blob/main/http/cves/2025/CVE-2025-64525.yaml

Security advisories

• withastro/astro/security/advisories/GHSA-hr2q-hp5q-x767
• withastro/astro/commit/dafbb1ba29912099c4faff1440033edc768af8b4

References

• CVE Record
• NVD entry