High · published August 1, 2026
axios versions 0.31.0 before 0.33.0 and 1.15.0 before 1.18.0 fail to recognize 0.0.0.0 as a loopback address in shouldBypassProxy.js, allowing requests to 0.0.0.0 to bypass NO_PROXY rules. Attackers can supply 0.0.0.0 URLs to route requests through configured proxies, potentially exposing local services when the proxy can reach the destination.
| Product | Versions | Fixed in |
|---|---|---|
| axios/axios | ≥ 0.31.0, < 0.33.0 | 0.33.0 |
| axios/axios | ≥ 1.15.0, < 1.18.0 | 1.18.0 |