# CVE-2026-42035

> Vulnerability · severity: **HIGH** (CVSS 7.4).

## Description

Axios is a promise based HTTP client for the browser and Node.js. Prior to 1.15.1 and 0.31.1, a prototype pollution gadget exists in the Axios HTTP adapter (lib/adapters/http.js) that allows an attacker to inject arbitrary HTTP headers into outgoing requests. The vulnerability exploits duck-type checking of the data payload, where if Object.prototype is polluted with getHeaders, append, pipe, on, once, and Symbol.toStringTag, Axios misidentifies any plain object payload as a FormData instance and calls the attacker-controlled getHeaders() function, merging the returned headers into the outgoing request. The vulnerable code resides exclusively in lib/adapters/http.js. The prototype pollution source does not need to originate from Axios itself — any prototype pollution primitive in any dependency in the application's dependency tree is sufficient to trigger this gadget. This vulnerability is fixed in 1.15.1 and 0.31.1.

## Key facts

- **CVE ID:** CVE-2026-42035
- **Published:** 2026-04-24
- **CVSS severity:** HIGH
- **CVSS base score:** 7.4
- **CWE codes:** CWE-113, CWE-1321

## Affected products

- `axios:axios`

## Primary sources

- NIST NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-42035

## Citation

> AI Analytics. CVE-2026-42035. Retrieved 2026-07-29 from https://api.ai-analytics.org/cve/CVE-2026-42035. Derived from NIST NVD. Licensed CC0.

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