Axios: Header Injection via Prototype Pollution

Description

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.

Recommendation

Update the axios package to the latest compatible version. Followings are version details:

• Affected version(s): **<= 0.31.0

  >= 1.0.0, < 1.15.1**

• Patched version(s): **0.31.1

  1.15.1**

References

• GHSA-6chq-wfr3-2hj9
• CVE-2026-42035
• CWE-113
• CWE-1321
• CAPEC-310
• OWASP 2021-A3
• OWASP 2021-A6

Related Issues

• Axios: XSRF Token Cross-Origin Leakage via Prototype Pollution Gadget in `withXSRFToken` Boolean Coercion - CVE-2026-42042
• Axios: Authentication Bypass via Prototype Pollution Gadget in `validateStatus` Merge Strategy - CVE-2026-42041
• Axios has Unrestricted Cloud Metadata Exfiltration via Header Injection Chain - CVE-2026-40175
• Axios: Invisible JSON Response Tampering via Prototype Pollution Gadget in `parseReviver` - CVE-2026-42044

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Tags:

npm

axios