Threat intelligence dashboard
CVE-2026-101903high

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-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.

Risk score

8.2

CVSS 4.0

Vendor
axios
Product
axios
CWE
CWE-1333
Published
Sep 28, 2026
Updated
Sep 28, 2026
CISA KEV
Not flagged

Affected products and versions

axios

axios

Version / rangeStatusType
>= 1.16.1, < 1.20.0affected—

Technical metrics

8.2

CVSS 4.0

Severity
high
Source
GitHub_M
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