Server-side Request Forgery (SSRF) Affecting @astrojs/internal-helpers package, versions <0.7.3
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published29 Oct 2025
- disclosed28 Oct 2025
- creditping, Avalanche Ridings
Introduced: 28 Oct 2025
NewCVE-2025-59837 (opens in a new tab)How to fix?
Upgrade @astrojs/internal-helpers to version 0.7.3 or higher.
Overview
@astrojs/internal-helpers is an Internal helpers used by core Astro packages.
Affected versions of this package are vulnerable to Server-side Request Forgery (SSRF) via the /_image endpoint. An attacker can access internal or unauthorized resources by submitting crafted URLs to the generated image optimization endpoint configured with output: server and utilizing default imageService: compile.
Note:
This was partially fixed by the patch for CVE-2025-58179. That fix blocks http://, https:// and //, but can be bypassed using backslashes (\); the endpoint still issues a server-side fetch.