withastro/astro · Security
Astro's bypass of image proxy domain validation leads to SSRF and potential XSS
- GHSA ID
- GHSA-qcpr-679q-rhm2
- CVE ID
- CVE-2025-59837
- Severity
- high
- Published
- Updated
- CVSS
- 7.2 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
- CVSS v3
- 7.2 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Description
Summary
This is a patch bypass of CVE-2025-58179 in commit 9ecf359. The fix blocks http://, https:// and //, but can be bypassed using backslashes (\) - the endpoint still issues a server-side fetch.
PoC
CWEs
- CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
- CWE-918 · Server-Side Request Forgery (SSRF)
References
- https://github.com/withastro/astro/security/advisories/GHSA-qcpr-679q-rhm2 ↗
- https://nvd.nist.gov/vuln/detail/CVE-2025-59837 ↗
- https://github.com/withastro/astro/commit/1e2499e8ea83ebfa233a18a7499e1ccf169e56f4 ↗
- https://github.com/withastro/astro/commit/9ecf3598e2b29dd74614328fde3047ea90e67252 ↗
- https://github.com/advisories/GHSA-qcpr-679q-rhm2 ↗