Axios v1.15.0 Security Patch: Critical Prototype Pollution Chain Enables Cloud Metadata Exfiltration, RCE

A critical security vulnerability in the widely-used Axios HTTP client library has been patched, exposing a dangerous attack chain that could allow attackers to escalate a common flaw into full system compromise. The vulnerability, tracked as CVE-2026-40175, centers on a specific "Gadget" attack vector. This flaw enables an attacker to exploit Prototype Pollution in any third-party dependency within a project and chain it to achieve Remote Code Execution (RCE) or, more critically, unrestricted exfiltration of sensitive cloud metadata.

The core of the issue is a header injection vulnerability within Axios versions prior to 1.15.0. An attacker who can introduce Prototype Pollution into an application's environment—a common vulnerability in many JavaScript packages—can manipulate Axios's internal object prototypes. This manipulation allows the injection of malicious headers into HTTP requests. The most severe consequence is the ability to redirect internal requests, typically meant for retrieving instance metadata from cloud providers like AWS, Google Cloud, or Azure, to an attacker-controlled server. This creates a direct pipeline for stealing cloud access keys, security credentials, and other sensitive infrastructure secrets.

The patch in Axios v1.15.0 addresses this header injection flaw, breaking the critical link in the attack chain. The update, flagged as a security priority, moves the library from version 1.13.6 to 1.15.0. This incident underscores a significant supply chain risk: a ubiquitous, foundational library like Axios can become an amplifier for vulnerabilities elsewhere in the dependency tree, turning localized code flaws into catastrophic security breaches affecting cloud infrastructure integrity. All projects using Axios must prioritize this update to mitigate the risk of credential theft and potential cloud account takeover.