Vulnerability · Published Sep 28, 2026 · Assigned by GitHub_M
CVE-2026-101903Axios: ReDoS in fromDataURI data: URL parser freezes the Node event loop (DoS)
High 8.2
In plain English
A high-severity regular-expression denial of service in axios from axios. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 38% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:13 | node-axios | no fix listed | DEBIAN-CVE-2026-101903 |
| Debian:14 | node-axios | 1.20.0-1 | DEBIAN-CVE-2026-101903 |
| Ubuntu:26.10 | node-axios | no fix listed | UBUNTU-CVE-2026-101903 |
| npm | axios | 1.20.0 | GHSA-c29m-xwm3-cm6r |
Affected products (as reported)
Weakness: CWE-1333 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
References
- https://github.com/axios/axios/security/advisories/GHSA-c29m-xwm3-cm6r x_refsource_CONFIRM
- https://github.com/axios/axios/pull/11141 x_refsource_MISC
- https://github.com/axios/axios/commit/d19040bda7a8be2f82c3c6e1a5bc03917daee39a x_refsource_MISC
- https://github.com/axios/axios/releases/tag/v1.20.0 x_refsource_MISC