GHSA-9WX3-P993-35VP: axios Npm

Vulnerability summary

GHSA-9WX3-P993-35VP is a medium (CVSS 6.3) vulnerability in axios Npm.

Timeline

1. 01-08-2026
   PublishedVulnerability first disclosed.
2. 10-09-2026
   Last modifiedVulnerability information updated.

Description

Duplicate Advisory: Axios: Nested axios option objects can consume polluted prototype values ## Duplicate Advisory This advisory has been withdrawn because it is a duplicate of GHSA-7q8q-rj6j-mhjq. This link is maintained to preserve external references. ## Original Description 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.

No weakness data has been published for this record.