What’s Vulnerable › Vulnerabilities

CVE-2026-102983: Astro: Netlify Image CDN allowlist bypass enables SSRF

• Severity: medium (CVSS 6.3 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-30 · updated 2026-09-30
• Weakness: CWE-625

Description

Astro is a web framework for content-driven websites. From 5.2.0 until 8.2.4, the @astrojs/netlify adapter generates regular expressions for Netlify Image CDN remote-image allowlists without anchoring them to the beginning of the URL. Because Netlify evaluates these expressions with RegExp.test(), an allowed origin appearing only in a source URL's path or query can satisfy image.domains or image.remotePatterns while the URL's actual host remains attacker-controlled. An unauthenticated request to the public /.netlify/images endpoint can therefore cause the Image CDN to request attacker-selected URLs and may probe or reach internal services. Netlify egress protections may constrain reachable targets, and image transformation limits direct response exfiltration; no confidentiality or integrity impact has been demonstrated. This issue is fixed in version 8.2.4.

Affected products

• withastro astro: from 5.2.0, < 8.2.4
• @astrojs netlify: from 5.2.0, < 8.2.4

References

• https://github.com/withastro/astro/commit/e362d4cf540b27730482455c8fc02efe57d16702
• https://github.com/withastro/astro/pull/17752
• https://github.com/withastro/astro/releases/tag/@astrojs/netlify@8.2.4
• https://github.com/withastro/astro/security/advisories/GHSA-4233-jc72-56c5

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