CVE-2026-42264: Axios: Prototype pollution read-side gadgets in HTTP adapter allow credential injection and request hijacking

Severity: critical (CVSS 9.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.8% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2026-05-08 · updated 2026-09-11
Weakness: CWE-1321

Description

Axios is a promise based HTTP client for the browser and Node.js. From version 1.0.0 to before version 1.15.2, fFive config properties (auth, baseURL, socketPath, beforeRedirect, and insecureHTTPParser) in the HTTP adapter are read via direct property access without hasOwnProperty guards, making them exploitable as prototype pollution gadgets. When Object.prototype is polluted by another dependency in the same process, axios silently picks up these polluted values on every outbound HTTP request. This issue has been patched in version 1.15.2.

Affected products

axios: from 1.0.0 before 1.15.2 — fixed in 1.15.2

How to fix

Upgrade to a fixed version: axios 1.15.2. Check the vendor advisory for mitigations.

References

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