Axios Vulnerabilities Could Let Attackers Bypass Proxy Controls and Launch SSRF Exploits

Axios maintainers have announced the discovery of several high‑severity security flaws that enable attackers to circumvent proxy and DNS restrictions in server‑side environments, potentially opening the door to server‑side request forgery (SSRF) attacks against internal services and cloud metadata endpoints.

Axios is a widely adopted JavaScript library used to make HTTP requests from both browser‑based front ends and Node.js back‑ends. Its ease of use and flexible configuration have made it a staple in modern web development, appearing in countless open‑source projects and commercial applications.

The disclosed vulnerabilities stem from how Axios processes request URLs and proxy settings. By supplying specially crafted URLs, an attacker can manipulate the library’s internal routing logic, causing it to ignore configured proxy allow‑lists or DNS filters. This behavior permits the request to be redirected to arbitrary internal addresses, effectively bypassing network‑level defenses that rely on proxy or DNS controls.

Such bypasses are especially dangerous in cloud environments where metadata services expose sensitive credentials. If an attacker can force a server‑side Axios call to reach an endpoint like the AWS EC2 metadata service or the Google Cloud metadata server, they may retrieve access keys, tokens, or other privileged information that can be used to compromise the broader infrastructure.

The flaws were first reported by the security research group GBHackers. After verification, Axios maintainers issued an advisory that details the affected versions and the steps required to remediate the issue. Patches have been published, and users are urged to upgrade to the latest release to close the attack surface.

Security experts recommend that developers not only apply the patches but also review their outbound traffic policies. Implementing strict network egress controls, limiting access to internal IP ranges, and employing additional request validation can reduce the risk of SSRF exploitation even if a library vulnerability is present.

As the incident highlights, third‑party libraries remain a critical component of the software supply chain. Ongoing monitoring, timely vulnerability disclosure, and rapid patch adoption are essential practices for organizations that rely on open‑source tools like Axios to maintain a resilient security posture.