{"id":"CVE-2026-25224","aliases":["GHSA-mrq3-vjjr-p77c"],"url":"https://o3.security/vulnerability/CVE-2026-25224","summary":"Fastify Vulnerable to DoS via Unbounded Memory Allocation in sendWebStream","details":"Fastify is a fast and low overhead web framework, for Node.js. Prior to version 5.7.3, a denial-of-service vulnerability in Fastify’s Web Streams response handling can allow a remote client to exhaust server memory. Applications that return a ReadableStream (or Response with a Web Stream body) via reply.send() are impacted. A slow or non-reading client can trigger unbounded buffering when backpressure is ignored, leading to process crashes or severe degradation. This issue has been patched in version 5.7.3.","published":"2026-02-03T21:21:35.437Z","modified":"2026-07-15T01:48:52.397658919Z","cvss":{"score":3.7,"severity":"LOW","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"fastify","fixedVersion":"5.7.3"}],"fix":{"url":"https://github.com/fastify/fastify/commit/eb11156396f6a5fedaceed0140aed2b7f026be37","label":"fastify/fastify@eb11156"},"references":[{"type":"WEB","url":"https://hackerone.com/reports/3524779"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/25xxx/CVE-2026-25224.json"},{"type":"ADVISORY","url":"https://github.com/fastify/fastify/security/advisories/GHSA-mrq3-vjjr-p77c"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-25224"},{"type":"FIX","url":"https://github.com/fastify/fastify/commit/eb11156396f6a5fedaceed0140aed2b7f026be37"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-15T01:48:52.397658919Z"}}