CVE-2026-67314

Summary

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.

Affected Software

VendorProductVersion RangeStatus
axiosaxios1.15.2 < 1.18.0affected
axiosaxios1.18.0unaffected

Weaknesses

  • CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')

References