CVE-2026-101906
Axios: ReDoS (O(NĀ²)) in shouldBypassProxy host normalization, reachable via untrusted redirect Location
Axios is a promise-based HTTP client for the browser and Node.js. From 1.15.0 until 1.20.0, Axios shouldBypassProxy applies a quadratic trailing-dot regular expression to redirect hostnames. HTTP_PROXY or HTTPS_PROXY is configured, NO_PROXY or no_proxy is non-empty, redirects are followed, and a crafted redirect Location contains many dots followed by a non-dot character. Hostname.replace(/.+$/, '') backtracks quadratically while processing the crafted redirect hostname. Synchronous regular-expression processing can block the Node.js event loop and cause denial of service. This issue is fixed in version 1.20.0.
| CWE | CWE-400 CWE-1333 |
| Vendor | axios |
| Product | axios |
| Published | Sep 28, 2026 |
| Last Updated | Sep 28, 2026 |
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