Em resumo
- CVE-2026-42034 é uma vulnerabilidade MÉDIO (CVSS 5.3) que afeta axios (axios), axios.
- Chance de exploração nos próximos 30 dias (EPSS): 0.33%, maior que 25.8% das vulnerabilidades.
- Correção: atualize para 1.15.1, 0.31.1 ou posterior.
| Package | Affected versions | Patched versions |
|---|
| axios | ≥ 1.0.0, < 1.15.1< 0.31.1
| 1.15.10.31.1
|
| axios npm | ≥ 1.0.0, < 1.15.1< 0.31.1
| 1.15.10.31.1
|
Description
Summary
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.
Details
Relevant flow in lib/adapters/http.js:
- 556-564: maxBodyLength check applies only to buffered/non-stream data.
- 681-682: maxRedirects === 0 selects native http/https transport.
- 694-699: options.maxBodyLength is set, but native transport does not enforce it.
- 925-945: stream is piped directly to socket (data.pipe(req)) with no Axios byte counting.
This creates a path-specific bypass for streamed uploads.
PoC
Environment:
- Axios main at commit f7a4ee2
- Node v24.2.0
Steps:
- Start an HTTP server that counts uploaded bytes and returns {received}.
- Send a 2 MiB Readable stream with:
- adapter: 'http'
- maxBodyLength: 1024
- maxRedirects: 0
Observed:
- Request succeeds; server reports received: 2097152.
Control checks:
- Same stream with default/nonzero redirects: rejected with ERR_FR_MAX_BODY_LENGTH_EXCEEDED.
- Buffered body with maxRedirects: 0: rejected with ERR_BAD_REQUEST.
Impact
Type: DoS / uncontrolled upstream upload / resource exhaustion.
Impacted: Node.js services using streamed request bodies with maxBodyLength expecting hard enforcement, especially when following Axios guidance to use maxRedirects: 0 for streams.
NVD 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. This vulnerability is fixed in 1.15.1 and 0.31.1.
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