Vulnerability Details CVE-2026-27829
Astro is a web framework. In versions 9.0.0 through 9.5.3, a bug in Astro's image pipeline allows bypassing `image.domains` / `image.remotePatterns` restrictions, enabling the server to fetch content from unauthorized remote hosts. Astro provides an `inferSize` option that fetches remote images at render time to determine their dimensions. Remote image fetches are intended to be restricted to domains the site developer has manually authorized (using the `image.domains` or `image.remotePatterns` options). However, when `inferSize` is used, no domain validation is performed — the image is fetched from any host regardless of the configured restrictions. An attacker who can influence the image URL (e.g., via CMS content or user-supplied data) can cause the server to fetch from arbitrary hosts. This allows bypassing `image.domains` / `image.remotePatterns` restrictions to make server-side requests to unauthorized hosts. This includes the risk of server-side request forgery (SSRF) against internal network services and cloud metadata endpoints. Version 9.5.4 fixes the issue.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.001
EPSS Ranking 22.2%
CVSS Severity
CVSS v3 Score 6.5
References
Products affected by CVE-2026-27829
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cpe:2.3:a:astro:@astrojs/node:9.0.0
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cpe:2.3:a:astro:@astrojs/node:9.0.3
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cpe:2.3:a:astro:@astrojs/node:9.1.0
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cpe:2.3:a:astro:@astrojs/node:9.1.1
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cpe:2.3:a:astro:@astrojs/node:9.1.2
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cpe:2.3:a:astro:@astrojs/node:9.1.3
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cpe:2.3:a:astro:@astrojs/node:9.2.0
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cpe:2.3:a:astro:@astrojs/node:9.2.1
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cpe:2.3:a:astro:@astrojs/node:9.2.2
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cpe:2.3:a:astro:@astrojs/node:9.3.0
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cpe:2.3:a:astro:@astrojs/node:9.3.1
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cpe:2.3:a:astro:@astrojs/node:9.3.2
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cpe:2.3:a:astro:@astrojs/node:9.3.3
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cpe:2.3:a:astro:@astrojs/node:9.4.0
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cpe:2.3:a:astro:@astrojs/node:9.4.1
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cpe:2.3:a:astro:@astrojs/node:9.4.2
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cpe:2.3:a:astro:@astrojs/node:9.4.3
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cpe:2.3:a:astro:@astrojs/node:9.4.4
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cpe:2.3:a:astro:@astrojs/node:9.4.5
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cpe:2.3:a:astro:@astrojs/node:9.4.6
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cpe:2.3:a:astro:@astrojs/node:9.5.0
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cpe:2.3:a:astro:@astrojs/node:9.5.1
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cpe:2.3:a:astro:@astrojs/node:9.5.2
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cpe:2.3:a:astro:@astrojs/node:9.5.3