CVE-2026-101903 — Axios: ReDoS in fromDataURI data: URL parser freezes the Node event loop (DoS)
Axios is a promise-based HTTP client for the browser and Node.js. From 1.16.1 until 1.20.0, the RFC 2397 regular expression allows slash characters on both sides of the media-ty…
Published: 2026-09-28 · CVSS: 8.2 · CVSS 4.0
Axios is a promise-based HTTP client for the browser and Node.js. From 1.16.1 until 1.20.0, the RFC 2397 regular expression allows slash characters on both sides of the media-type separator. An application passes an attacker-controlled malformed data URL containing many slash characters and no comma. the JavaScript regular-expression engine explores many separator placements before rejecting the URL. Synchronous excessive backtracking can block the Node.js event loop and cause denial of service. The affected identifiers are fromDataURI, DATA_URL_PATTERN, data:. This issue is fixed in version 1.20.0.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7