{"id":"CVE-2026-25224","state":"PUBLISHED","title":"Fastify Vulnerable to DoS via Unbounded Memory Allocation in sendWebStream","description":"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.","publishedAt":"2026-02-03T21:21:35.437Z","updatedAt":"2026-02-04T16:20:32.845Z","severity":{"score":3.7,"label":"Low","version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L","source":"GitHub_M"},"assigner":"GitHub_M","products":["fastify fastify"],"affected":[{"vendor":"fastify","product":"fastify","versions":[{"version":"< 5.7.3","status":"affected"}]}],"references":["https://github.com/fastify/fastify/security/advisories/GHSA-mrq3-vjjr-p77c","https://github.com/fastify/fastify/commit/eb11156396f6a5fedaceed0140aed2b7f026be37","https://hackerone.com/reports/3524779"],"weaknesses":["CWE-770"],"ingestedAt":"2026-10-29T20:11:21.040Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/25xxx/CVE-2026-25224.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-25224","state":"PUBLISHED","datePublished":"2026-02-03T21:21:35.437Z","dateUpdated":"2026-02-04T16:20:32.845Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-01-30T14:44:47.327Z"},"containers":{"cna":{"title":"Fastify Vulnerable to DoS via Unbounded Memory Allocation in sendWebStream","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"fastify","product":"fastify","versions":[{"version":"< 5.7.3","status":"affected"}]}],"references":[{"url":"https://github.com/fastify/fastify/security/advisories/GHSA-mrq3-vjjr-p77c","name":"https://github.com/fastify/fastify/security/advisories/GHSA-mrq3-vjjr-p77c","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/fastify/fastify/commit/eb11156396f6a5fedaceed0140aed2b7f026be37","name":"https://github.com/fastify/fastify/commit/eb11156396f6a5fedaceed0140aed2b7f026be37","tags":["x_refsource_MISC"]},{"url":"https://hackerone.com/reports/3524779","name":"https://hackerone.com/reports/3524779","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":3.7,"baseSeverity":"LOW","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-770","lang":"en","description":"CWE-770: Allocation of Resources Without Limits or Throttling","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-02-03T21:21:35.437Z"},"source":{"advisory":"GHSA-mrq3-vjjr-p77c","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-02-04T16:20:26.988188Z","id":"CVE-2026-25224","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-02-04T16:20:32.845Z"}}]}}}