CVE-2026-101902: Axios: Prototype-Pollution Gadget in the Default Instance Allows Inherited Object.prototype.method to Override HTTP Method
Axios is a promise-based HTTP client for the browser and Node.js. From 0.27.2 until 0.34.0 and 1.20.0, Axios default-instance requests that omit an explicit method can read an inherited method value from Object.prototype. If another vulnerability in the same process pollutes Object.prototype.method, calls such as axios.request({ url }) and axios({ url }) can send a state-changing HTTP method instead of the expected default GET. Axios does not create the prototype pollution source. This is a read-side gadget in axios request dispatch. This issue is fixed in version 0.34.0 and 1.20.0.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
axiosto a version that resolves this vulnerability.Fixed in 0.34.0 - Upgrade
Upgrade
axiosto a version that resolves this vulnerability.Fixed in 1.20.0
Event History
Frequently Asked Questions
What conditions are required for exploitation?
An attacker needs a separate vulnerability in the same process that can pollute Object.prototype.method. The affected Axios call must use the default instance and omit an explicit HTTP method, such as axios.request({ url }) or axios({ url }).
Are requests that explicitly set the HTTP method affected?
No. The issue applies when the request omits an explicit method and Axios can inherit method from Object.prototype; setting the method directly prevents that inherited value from being used.
Which Axios versions should be remediated?
The affected ranges are 0.27.2 through before 0.34.0, and versions before 1.20.0 in the 1.x line. The issue is fixed in 0.34.0 and 1.20.0.
What can be done if upgrading is not immediately possible?
Ensure default-instance requests explicitly set their HTTP method, particularly requests expected to be GET. Also identify and remediate any prototype-pollution vulnerability in the same process, because Axios is only the read-side gadget and does not create the pollution.