Resource exhaustion in Withastro Astro
CVE-2026-27729
Astro is a web framework. In versions 9.0.0 through 9.5.3, Astro server actions have no default request body size limit, which can lead to memory exhaustion DoS. A single large POST to a valid action endpoint can crash the server process o…
EPSS: 0.002 (37.1th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Withastro Astro — versions >= 9.0.0, < 9.5.4
Weakness classification (CWE)
References
- https://github.com/withastro/astro/security/advisories/GHSA-jm64-8m5q-4qh8 (x_refsource_CONFIRM)
- https://github.com/withastro/astro/pull/15564 (x_refsource_MISC)
- https://github.com/withastro/astro/commit/522f880b07a4ea7d69a19b5507fb53a5ed6c87f8 (x_refsource_MISC)
- https://github.com/withastro/astro/releases/tag/%40astrojs%2Fnode%409.5.4 (x_refsource_MISC)
Frequently asked questions
- What is CVE-2026-27729?
- CVE-2026-27729 is a medium-severity vulnerability in Withastro Astro, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 5.9/10. Published 2026-02-24.
- How severe is CVE-2026-27729?
- Medium severity. CVSS v3 base score is 5.9 out of 10.