Medium 6.5Published Feb 25, 2026

CVE-2026-27829Astro is vulnerable to SSRF due to missing allowlist enforcement in remote image inferSize

Updated under an hour ago (Oct 28, 2026, 1:50 AM ET)

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Every CVE for withastro astro

Exploited in the last 30 days

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.

CVSS: 6.5 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
Weakness (CWE): CWE-918
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Feb 26, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

withastro astro withastro:astro (from the name)	from 9.0.0, < 9.5.4	CNA record
astro @astrojs/node astro:@astrojs/node	from 9.0.0 before 9.5.4	NVD

References

References

https://github.com/withastro/astro/security/advisories/GHSA-cj9f-h6r6-4cx2	x-refsource-confirm, exploit, vendor-advisory
https://github.com/withastro/astro/commit/e01e98b063e90d274c42130ec2a60cc0966622c9	x-refsource-misc, patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.