## Axios Patches Critical Header Injection Flaw in HTTP Adapter (CVE-2026-42035)
A prototype pollution vulnerability in axios, a widely used JavaScript HTTP client library, has been identified and addressed through version 1.15.2. The flaw, tracked as CVE-2026-42035 and documented as GHSA-6chq-wfr3-2hj9, exists in the library's HTTP adapter implementation (lib/adapters/http.js). The vulnerability enables header injection through prototype pollution, a technique that exploits how JavaScript handles object inheritance. This class of flaw can allow attackers to manipulate HTTP request headers, potentially leading to request smuggling, cache poisoning, or session hijacking depending on how the library is integrated into applications. The security issue affects axios 1.15.0 and was patched in the 1.15.2 release, which users are strongly advised to upgrade to immediately.

Axios serves as a foundational dependency across countless JavaScript projects, from frontend frameworks to backend services, making this vulnerability particularly significant in scope. The library's ubiquity means the flaw could impact applications ranging from enterprise software to personal projects, though the actual risk depends heavily on specific implementation contexts. Developers using automatic dependency update tools such as Renovate Bot may already have the patch in their dependency trees, but manual verification remains advisable for projects with stricter change control processes.

Organizations using axios in their infrastructure should audit their dependencies to confirm whether they are running an affected version and apply the update as part of their patch management processes. Given the potential for header manipulation, teams should also review their application's request handling logic to ensure that even updated libraries cannot be leveraged to inject malicious headers through crafted inputs.
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- **Source**: GitHub Issues
- **Sector**: The Lab
- **Tags**: axios, CVE-2026-42035, prototype pollution, header injection, javascript security
- **Credibility**: unverified
- **Published**: 2026-05-09 14:32:10
- **ID**: 81155
- **URL**: https://whisperx.ai/en/intel/81155