CVE-2026-67319

axios before 0.33.0 (and 1.x before 1.18.0) can consume inherited properties from nested request option objects when the JavaScript process's Object.prototype has already been polluted by another component. While the top-level merged config uses a null prototype, nested plain objects such as auth and paramsSerializer are cloned into ordinary objects and read without own-property checks. When an application passes placeholder nested objects such as auth: {} or paramsSerializer: {}, inherited username/password values can cause silent injection of an Authorization: Basic header, and inherited encode/serialize values can alter query-string serialization (full serializer replacement requires a function-valued pollution primitive). This is exploitable only in the presence of pre-existing prototype pollution.

• CWE-1321

• https://github.com/axios/axios/security/advisories/GHSA-7q8q-rj6j-mhjq
• https://www.vulncheck.com/advisories/axios-before-prototype-pollution-via-nested-option-objects
• https://github.com/axios/axios/security/advisories/GHSA-7q8q-rj6j-mhjq

Published

Aug 1, 2026

Last Modified

Aug 3, 2026

Status

Received

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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