Axios v1.15.0 Patches Critical RCE Chain via Prototype Pollution & Cloud Metadata Exfiltration

A critical security update for the ubiquitous Axios HTTP client library patches a severe vulnerability chain that could allow attackers to escalate prototype pollution in any third-party dependency into full remote code execution or cloud metadata exfiltration. The flaw, tracked as CVE-2026-40175, represents a high-risk supply chain attack vector, where a seemingly minor vulnerability in one library component can be weaponized to compromise the entire application environment and underlying cloud infrastructure.

The vulnerability is a 'gadget' attack chain. It begins with prototype pollution—a common JavaScript vulnerability where an attacker can inject properties into global object prototypes. In this case, that initial pollution can be exploited within Axios to manipulate HTTP request headers. The manipulated headers are then used to perform unauthorized requests to internal cloud metadata services, such as those from AWS, Google Cloud, or Azure. This allows an attacker to exfiltrate sensitive credentials, access keys, and other security tokens that grant control over cloud resources, effectively turning a client-side bug into a cloud infrastructure breach.

The patch in version 1.15.0 closes this header injection pathway. This incident underscores the escalating threat of software supply chain attacks, where deeply nested dependencies create unpredictable risk surfaces. For development and security teams, the autoclosed GitHub pull request is not merely a routine dependency chore but a mandatory security patch. Failure to update leaves countless Node.js and frontend applications exposed to a potent attack that bridges application-layer bugs and infrastructure-level compromise, demanding immediate scrutiny of deployment pipelines.