Bug 2542583 (CVE-2026-101906)

Summary: CVE-2026-101906 axios: axios: Denial of Service via crafted redirect hostname
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
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Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in axios. A remote attacker operating a malicious server can cause a Denial of Service (DoS) by returning an HTTP redirect containing a crafted hostname. When proxy bypass settings are configured, the application processes the hostname with an inefficient regular expression that consumes excessive computational time. This processing blocks the application's execution thread, leaving the service unresponsive to other requests.
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Description OSIDB Bzimport 2026-09-28 17:46:45 UTC 
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.