# CVE-2026-101903: Axios: ReDoS in fromDataURI data: URL parser freezes the Node event loop (DoS)

> CVE-2026-101903: Axios: ReDoS in fromDataURI data: URL parser freezes the Node event loop (DoS). CVSS 8.2 (CVSS 4.0).

Canonical: https://rewindex.com/cve/CVE-2026-101903
Last updated: 2026-09-30T19:38:27Z

- Published: 2026-09-28 17:25 UTC · Updated: 2026-09-30 19:38 UTC · Assigner: GitHub\_M
- CVSS: 8.2 (CVSS 4.0) · Severity: High
- EPSS: 0.44%, 38th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-1333

## 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 vendors and products

- axios: axios

## Tracked companies

- [Confluence](https://rewindex.com/company/confluence.md)
- [Jira](https://rewindex.com/company/jira.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-101903)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-101903)
- [https://github.com/axios/axios/commit/d19040bda7a8be2f82c3c6e1a5bc03917daee39a](https://github.com/axios/axios/commit/d19040bda7a8be2f82c3c6e1a5bc03917daee39a)
- [https://github.com/axios/axios/pull/11141](https://github.com/axios/axios/pull/11141)
- [https://github.com/axios/axios/releases/tag/v1.20.0](https://github.com/axios/axios/releases/tag/v1.20.0)
- [https://github.com/axios/axios/security/advisories/GHSA-c29m-xwm3-cm6r](https://github.com/axios/axios/security/advisories/GHSA-c29m-xwm3-cm6r)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2026-101903 · Markdown: https://rewindex.com/cve/CVE-2026-101903.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-101903 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T03:10:40.483Z