CVE-2026-67314

axios versions >=1.15.2 and <1.18.0 contain prototype-pollution read-side gadgets in Basic auth subfield handling (lib/adapters/http.js and lib/helpers/resolveConfig.js). When an application is already affected by a separate prototype-pollution primitive and makes an axios request with an own auth object that omits the username and/or password properties, axios reads the inherited Object.prototype.username and Object.prototype.password values and uses them to construct an outbound 'Authorization: Basic ...' header. axios itself does not pollute prototypes. The practical impact is outbound request tampering: an attacker who controls the polluted prototype values can inject attacker-chosen Basic auth credentials or replace an existing Authorization header. Credential disclosure is only possible under additional application-specific conditions.

• CWE-1321

• https://github.com/axios/axios/security/advisories/GHSA-xj6q-8x83-jv6gExploit, Mitigation, Vendor Advisory
• https://www.vulncheck.com/advisories/axios-before-prototype-pollution-via-auth-subfieldsThird Party Advisory
• https://github.com/axios/axios/security/advisories/GHSA-xj6q-8x83-jv6gExploit, Mitigation, Vendor Advisory

Published

Aug 1, 2026

Last Modified

Sep 1, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
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