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Vulnerability · Published Sep 30, 2026 · Assigned by GitHub_M

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

Medium 6.3

In plain English

A medium-severity server-side request forgery in netlify from @astrojs. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 24% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)6.3Medium
Exploit odds (30 days)0.3%top 76.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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 packages & fixed versions

EcosystemPackageFixed inAdvisory
npm@astrojs/netlify8.2.4GHSA-4233-jc72-56c5

Affected products (as reported)

VendorProductVersions
withastro astro >= 5.2.0, < 8.2.4
@astrojs netlify >= 5.2.0, < 8.2.4

Weakness: CWE-625, CWE-918 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

References