EUVD-2026-57610Severity by source
AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
Netlify CDN endpoint is network-reachable with no auth (AV:N/PR:N), but exploitation requires a metacharacter-containing pathname in dev config (AC:H); impact is limited to partial image path disclosure with no integrity or availability effect.
Primary rating from Vendor (GitHub_M).
CVSS VectorVendor: GitHub_M
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
Lifecycle Timeline
3DescriptionCVE.org
Astro is a web framework for content-driven websites. Prior to 8.1.2, the Astro Netlify adapter converts each image.remotePatterns entry into a regular expression written to .netlify/v1/config.json under images.remote_images for Netlify's Image CDN allowlist. In packages/integrations/netlify/src/index.ts, remotePatternToRegex() escapes dots in hostname values but interpolates literal pathname values without escaping regular expression metacharacters such as ., +, ?, (, and [, so a restrictive pathname such as /img/v1.0/file also matches metacharacter-adjacent paths, including paths that cross a segment. Netlify enforces the generated regular expression directly and Astro's matchPattern() helper does not revalidate the request, allowing optimization of images on an already-allowed host that the declared pathname was intended to exclude. This issue is fixed in version 8.1.2.
AnalysisAI
Regex metacharacter injection in @astrojs/netlify prior to 8.1.2 causes the Netlify Image CDN allowlist to be broader than the developer intended, allowing optimization of images from unintended URL paths on already-allowed hostnames. The root cause is that remotePatternToRegex() escapes dots in hostnames but passes literal pathname values into the generated regex unescaped, so a pathname like /img/v1.0/file silently becomes a wildcard that matches /img/v1X0/file or /img/v1/0/file. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Three conditions must all be present: (1) the site uses @astrojs/netlify adapter at a version prior to 8.1.2, (2) at least one image.remotePatterns entry is configured with a literal pathname value containing a regex metacharacter - the most common real-world case is a dot in a version string (e.g., /img/v1.0/) or a file extension - and (3) the built site is deployed to Netlify with Netlify Image CDN active. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The provided CVSS 3.7 vector (AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N) is consistent with independent analysis. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker inspecting a Netlify-hosted Astro site's public CDN behavior identifies that the site allows image optimization for cdn.example.com. They request Netlify's image optimization endpoint with a URL pointing to https://cdn.example.com/img/v1X0/secret-file - where X replaces the dot in a version path segment - and Netlify's CDN processes the request because the unescaped dot in the generated allowlist regex matches any character, including the substituted character. … |
| Remediation | Upgrade @astrojs/netlify to version 8.1.2, which introduces proper regex metacharacter escaping for pathname values in remotePatternToRegex(). … Detailed patch versions, workarounds, and compensating controls in full report. |
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