Axios up to 0.31.0/1.15.0 lib/adapters/http.js getHeaders response splitting

Summaryinfo

A vulnerability categorized as problematic has been discovered in Axios up to 0.31.0/1.15.0. This impacts the function getHeaders in the library lib/adapters/http.js. Executing a manipulation can lead to response splitting. This vulnerability is registered as CVE-2026-42035. It is possible to launch the attack remotely. No exploit is available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability has been found in Axios up to 0.31.0/1.15.0 and classified as problematic. This vulnerability affects the function getHeaders in the library lib/adapters/http.js. The manipulation with an unknown input leads to a response splitting vulnerability. The CWE definition for the vulnerability is CWE-113. The product receives data from an HTTP agent/component (e.g., web server, proxy, browser, etc.), but it does not neutralize or incorrectly neutralizes CR and LF characters before the data is included in outgoing HTTP headers. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-42035 since 04/23/2026. The exploitation appears to be difficult. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are known technical details, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 313224 (Node.js Module axios < 1.15.1 Multiple Vulnerabilities), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 0.31.1 or 1.15.1 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (313224) and CERT Bund (WID-SEC-2026-1687). Once again VulDB remains the best source for vulnerability data.

Affected

• IBM License Metric Tool

Productinfo

Name

• Axios

Version

• 0.1
• 0.2
• 0.3
• 0.4
• 0.5
• 0.6
• 0.7
• 0.8
• 0.9
• 0.10
• 0.11
• 0.12
• 0.13
• 0.14
• 0.15
• 0.16
• 0.17
• 0.18
• 0.19
• 0.20
• 0.21
• 0.22
• 0.23
• 0.24
• 0.25
• 0.26
• 0.27
• 0.28
• 0.29
• 0.30
• 0.31.0
• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5
• 1.6
• 1.7
• 1.8
• 1.9
• 1.10
• 1.11
• 1.12
• 1.13
• 1.14
• 1.15.0

Website

• Product: https://github.com/axios/axios/

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Once again VulDB remains the best source for vulnerability data.

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