What is CVE-2026-27829?

CVE-2026-27829 is a medium-severity vulnerability in Withastro Astro, classified under Server-Side Request Forgery (SSRF). CVSS score: 6.5/10. Published 2026-02-26.

How severe is CVE-2026-27829?

Medium severity. CVSS v3 base score is 6.5 out of 10.

SSRF in Withastro Astro

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 p…

Vulnerability class: SSRF (Server-Side Request Forgery)

EPSS: 0.001 (22.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L.

Affected products

Withastro Astro — versions >= 9.0.0, < 9.5.4

Weakness classification (CWE)

CWE-918 — Server-Side Request Forgery (SSRF)

References

https://github.com/withastro/astro/security/advisories/GHSA-cj9f-h6r6-4cx2 (x_refsource_CONFIRM)
https://github.com/withastro/astro/commit/e01e98b063e90d274c42130ec2a60cc0966622c9 (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-27829?: CVE-2026-27829 is a medium-severity vulnerability in Withastro Astro, classified under Server-Side Request Forgery (SSRF). CVSS score: 6.5/10. Published 2026-02-26.
How severe is CVE-2026-27829?: Medium severity. CVSS v3 base score is 6.5 out of 10.