{"id":"GHSA-5c9x-8gcm-mpgx","revision":null,"records":[{"revision":"a89cfff5ce69487bb82b050b37af9415","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-42034","aliases":[],"title":"Axios: HTTP adapter streamed uploads bypass maxBodyLength when maxRedirects: 0","description":"Axios is a promise based HTTP client for the browser and Node.js. Prior to 1.15.1 and 0.31.1, for stream request bodies, maxBodyLength is bypassed when maxRedirects is set to 0 (native http/https transport path). Oversized streamed uploads are sent fully even when the caller sets strict body limits. 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Oversized streamed uploads are sent fully even when the caller sets strict body limits.\n\n### Details\n\nRelevant flow in lib/adapters/http.js:\n  - 556-564: maxBodyLength check applies only to buffered/non-stream data.\n  - 681-682: maxRedirects === 0 selects native http/https transport.\n  - 694-699: options.maxBodyLength is set, but native transport does not enforce it.\n  - 925-945: stream is piped directly to socket (data.pipe(req)) with no Axios byte counting.\n\nThis creates a path-specific bypass for streamed uploads.\n\n  ### PoC\n\nEnvironment:\n\n  - Axios main at commit f7a4ee2\n  - Node v24.2.0\n\n  Steps:\n  1. Start an HTTP server that counts uploaded bytes and returns {received}.\n  2. Send a 2 MiB Readable stream with:\n      - adapter: 'http'\n      - maxBodyLength: 1024\n      - maxRedirects: 0\n\n  Observed:\n  - Request succeeds; server reports received: 2097152.\n\n  Control checks:\n  - Same stream with default/nonzero redirects: rejected with ERR_FR_MAX_BODY_LENGTH_EXCEEDED.\n  - Buffered body with maxRedirects: 0: rejected with ERR_BAD_REQUEST.\n\n  ### Impact\nType: DoS / uncontrolled upstream upload / resource exhaustion.\nImpacted: Node.js services using streamed request bodies with maxBodyLength expecting hard enforcement, especially when following Axios guidance to use maxRedirects: 0 for streams.","state":0,"publishedAt":"2026-05-05T00:33:25+00:00","modifiedAt":"2026-09-10T03:50:45.7079564+00:00","affected":[{"ecosystem":"npm","name":"axios","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"1.0.0"},{"kind":"fixed","version":"1.15.1"}]}],"versions":[],"rawVersionEvidence":null},{"ecosystem":"npm","name":"axios","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"0.31.1"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"MODERATE"}],"references":["https://github.com/axios/axios/security/advisories/GHSA-5c9x-8gcm-mpgx","https://nvd.nist.gov/vuln/detail/CVE-2026-42034","https://github.com/axios/axios"],"sourceUrl":"https://github.com/advisories/GHSA-5c9x-8gcm-mpgx","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-5c9x-8gcm-mpgx","identifiers":["GHSA-5c9x-8gcm-mpgx","CVE-2026-42034"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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