What is CVE-2026-29772?

CVE-2026-29772 is a medium-severity vulnerability in Withastro Astro, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 5.9/10. Published 2026-03-24.

How severe is CVE-2026-29772?

Medium severity. CVSS v3 base score is 5.9 out of 10.

Resource exhaustion in Withastro Astro

CVE-2026-29772

Astro is a web framework. Prior to version 10.0.0, Astro's Server Islands POST handler buffers and parses the full request body as JSON without enforcing a size limit. Because JSON.parse() allocates a V8 heap object for every element in th…

EPSS: 0.000 (7.8th 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 < 10.0.0

Weakness classification (CWE)

CWE-770 — Allocation of Resources Without Limits or Throttling

References

https://github.com/withastro/astro/security/advisories/GHSA-3rmj-9m5h-8fpv (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-29772?: CVE-2026-29772 is a medium-severity vulnerability in Withastro Astro, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 5.9/10. Published 2026-03-24.
How severe is CVE-2026-29772?: Medium severity. CVSS v3 base score is 5.9 out of 10.