## Axios Library Exposes Critical Header Injection Flaw via Prototype Pollution
A security vulnerability in Axios, one of the most widely-used JavaScript HTTP clients, has been disclosed that could allow attackers to inject arbitrary HTTP headers into outgoing requests through prototype pollution. The flaw is tracked as CVE-2026-42035 and documented under GitHub Security Advisory GHSA-6chq-wfr3-2hj9. The vulnerability resides in the HTTP adapter component located at lib/adapters/http.js, creating a prototype pollution gadget that compromises request integrity.

The mechanism exploits JavaScript's object prototype chain, enabling malicious actors to manipulate HTTP headers on requests initiated by affected applications. Prototype pollution vulnerabilities are particularly dangerous because they can cascade through an application's runtime, affecting all objects that inherit from the polluted prototype. In this case, the Axios HTTP adapter fails to adequately sanitize inputs, creating an attack vector that could facilitate request smuggling, credential theft, cache poisoning, or unauthorized API access depending on how downstream systems process injected headers.

The security advisory has triggered dependency update alerts across projects using Axios version 0.30.x, with automated tools like Renovate flagging the need to upgrade to version 1.15.2 or later. Given Axios's ubiquity in Node.js and browser-based applications, the vulnerability's potential footprint is significant. Organizations should audit their dependency trees for affected Axios versions, assess whether applications handle user-controlled input that could reach Axios configuration objects, and prioritize patching in environments processing authentication tokens or sensitive data. The OpenSSF Scorecard integration in the advisory indicates active security monitoring of the Axios repository, suggesting maintainers are engaged with vulnerability response.
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- **Source**: GitHub Issues
- **Sector**: The Lab
- **Tags**: axios, security-vulnerability, prototype-pollution, header-injection, CVE-2026-42035
- **Credibility**: unverified
- **Published**: 2026-05-08 17:24:40
- **ID**: 80707
- **URL**: https://whisperx.ai/en/intel/80707