# CVE-2026-42037

> Vulnerability · severity: **MEDIUM** (CVSS 5.3).

## Description

Axios is a promise based HTTP client for the browser and Node.js. From 1.0.0 to before 1.15.1, the FormDataPart constructor in lib/helpers/formDataToStream.js interpolates value.type directly into the Content-Type header of each multipart part without sanitizing CRLF (\r\n) sequences. An attacker who controls the .type property of a Blob/File-like object (e.g., via a user-uploaded file in a Node.js proxy service) can inject arbitrary MIME part headers into the multipart form-data body. This bypasses Node.js v18+ built-in header protections because the injection targets the multipart body structure, not HTTP request headers. This vulnerability is fixed in 1.15.1.

## Key facts

- **CVE ID:** CVE-2026-42037
- **Published:** 2026-04-24
- **CVSS severity:** MEDIUM
- **CVSS base score:** 5.3
- **CWE codes:** CWE-93

## Affected products

- `axios:axios`

## Primary sources

- NIST NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-42037

## Citation

> AI Analytics. CVE-2026-42037. Retrieved 2026-08-10 from https://api.ai-analytics.org/cve/CVE-2026-42037. Derived from NIST NVD. Licensed CC0.

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