---
id: CVE-2026-101903
title: Axios is a promise-based HTTP client for the browser and Node.js
summary: >-
  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 m…
severity: high
cvss: 8.2
cvssVector: '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'
cwe:
  - CWE-1333
vendor: axios
product: axios
affected:
  - 'axios >= 1.16.1, < 1.20.0'
published: '2026-09-28'
updated: '2026-09-28'
sourceUpdated: '2026-09-28T18:17:18.560'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-101903'
references:
  - url: >-
      https://github.com/axios/axios/commit/d19040bda7a8be2f82c3c6e1a5bc03917daee39a
    label: security-advisories@github.com
  - url: 'https://github.com/axios/axios/pull/11141'
    label: security-advisories@github.com
  - url: 'https://github.com/axios/axios/releases/tag/v1.20.0'
    label: security-advisories@github.com
  - url: 'https://github.com/axios/axios/security/advisories/GHSA-c29m-xwm3-cm6r'
    label: security-advisories@github.com
  - url: 'https://github.com/axios/axios/security/advisories/GHSA-c29m-xwm3-cm6r'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
  - cve.org
  - exploit-available
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-28T17:48:43.428191Z'
cvssSource: cna
ingestedAt: '2026-09-28T18:17:54.306Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.