Critical Axios Vulnerability Enables Remote Code Execution – Proof of Concept Released
A critical security vulnerability has been identified in Axios, a widely utilized promise-based HTTP client for Node.js and browsers. This flaw, designated as CVE-2026-40175, poses a significant risk by allowing attackers to execute remote code or gain complete control over cloud environments without requiring direct user interaction.
Understanding the Vulnerability
The root of this vulnerability lies in Axios’s header processing mechanism, particularly within the `lib/adapters/http.js` file. The software’s failure to properly sanitize HTTP headers makes it susceptible to prototype pollution—a scenario where an attacker manipulates the prototype of a JavaScript object, leading to unintended behavior. In this context, if a malicious actor successfully pollutes the `Object.prototype` through a third-party library, Axios inadvertently merges these malicious properties during its configuration process.
This merging process becomes especially dangerous because Axios does not adequately sanitize the merged header values for carriage return and line feed characters. Consequently, the polluted property can serve as a covert request-smuggling payload. This exploit chain is particularly severe as it requires no direct user interaction; even a hardcoded request can be hijacked to trigger the full exploit sequence.
Potential Impact
Once the smuggled secondary request is executed, it can directly target the AWS Metadata Service. This sophisticated exploit bypasses AWS IMDSv2 security controls by injecting the necessary session token headers—an action that standard server-side request forgery attacks cannot achieve. Upon obtaining a valid session token, attackers can steal IAM credentials, enabling them to escalate privileges rapidly, access restricted internal administrative panels, and potentially take over the entire cloud account.
Given Axios’s widespread adoption, this vulnerability affects numerous applications across the global development ecosystem. The following versions are impacted:
– Vulnerable versions: All releases before 1.15.0 (including v0.x and v1.x)
– Patched versions: 1.15.0 and later
Mitigation Strategies
To address this critical vulnerability, development and security teams should take the following steps:
1. Upgrade Axios: Immediately update Axios to version 1.15.0 or later. This release introduces stringent header validation mechanisms, ensuring that any header values containing invalid characters will trigger a critical security error before processing.
2. Audit Dependencies: Conduct a comprehensive audit of the entire dependency graph to identify and address prototype pollution vulnerabilities in other npm packages. Since Axios can leverage these vulnerabilities to execute the exploit, securing the entire software stack is essential for robust security.
Conclusion
The disclosure of CVE-2026-40175 underscores the importance of proactive security measures in software development. By promptly updating Axios and thoroughly auditing dependencies, organizations can mitigate the risks associated with this vulnerability and safeguard their applications and cloud environments from potential exploitation.
