{"id":"CVE-2026-27829","aliases":["GHSA-cj9f-h6r6-4cx2"],"url":"https://o3.security/vulnerability/CVE-2026-27829","summary":"Astro is vulnerable to SSRF due to missing allowlist enforcement in remote image inferSize","details":"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.","published":"2026-02-26T00:36:40.497Z","modified":"2026-08-07T11:50:50.764804641Z","cvss":{"score":6.5,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"@astrojs/node","fixedVersion":"9.5.4"}],"fix":{"url":"https://github.com/withastro/astro/commit/e01e98b063e90d274c42130ec2a60cc0966622c9","label":"withastro/astro@e01e98b"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/27xxx/CVE-2026-27829.json"},{"type":"ADVISORY","url":"https://github.com/withastro/astro/security/advisories/GHSA-cj9f-h6r6-4cx2"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-27829"},{"type":"FIX","url":"https://github.com/withastro/astro/commit/e01e98b063e90d274c42130ec2a60cc0966622c9"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-07T11:50:50.764804641Z"}}