axios Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution) Vulnerability - CVE-2026-42033

Axios is a promise based HTTP client for the browser and Node.js. Prior to 1.15.1 and 0.31.1 when Object.prototype has been polluted by any co-dependency with keys that axios reads without a hasOwnProperty guard an attacker can (a) silently intercept and modify every JSON response before the application sees it or (b) fully hijack the underlying HTTP transport gaining access to request credentials headers and body. The precondition is prototype pollution from a separate source in the same process. This vulnerability is fixed in 1.15.1 and 0.31.1.