{"cve":"CVE-2026-29772","nvd":{"published":"2026-03-24T19:16:51.153","modified":"2026-06-17T10:29:51.450","status":"Analyzed","description":"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 the input, a crafted payload of many small JSON objects achieves ~15x memory amplification (wire bytes to heap bytes), allowing a single unauthenticated request to exhaust the process heap and crash the server. The /_server-islands/[name] route is registered on all Astro SSR apps regardless of whether any component uses server:defer, and the body is parsed before the island name is validated, so any Astro SSR app with the Node standalone adapter is affected. This issue has been patched in version 10.0.0.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-770"],"references":["https://github.com/withastro/astro/security/advisories/GHSA-3rmj-9m5h-8fpv"],"products":["astro:\\@astrojs\\/node"],"source":"nvd","synced_at":"2026-10-19T22:26:19.218427112+00:00"},"epss":{"cve":"CVE-2026-29772","score":0.00385,"percentile":0.32579,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-3rmj-9m5h-8fpv","url":"https://osv.dev/vulnerability/GHSA-3rmj-9m5h-8fpv","summary":"Astro: Memory exhaustion DoS due to missing request body size limit in Server Islands","modified":"2026-03-30T14:05:54.039770Z","packages":[{"ecosystem":"npm","name":"@astrojs/node","purl":"pkg:npm/%40astrojs/node","ranges":["<10.0.0"],"fixed":["10.0.0"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}