---
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'
patched:
  - axios 1.20.0
published: '2026-09-28'
updated: '2026-09-30'
sourceUpdated: '2026-09-30T19:38:27.293'
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
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-101903.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-101903'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2542580'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-101903'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-101903'
  - url: 'https://github.com/advisories/GHSA-c29m-xwm3-cm6r'
  - url: 'https://access.redhat.com/errata/RHSA-2026:74871'
  - url: 'https://access.redhat.com/errata/RHSA-2026:74869'
  - url: 'https://access.redhat.com/errata/RHSA-2026:74872'
tags:
  - nvd
  - cve.org
  - exploit-available
  - csaf
  - vex
  - red-hat
  - ghsa
  - npm
epss: 0.00436
epssPercentile: 0.37678
aliases:
  - GHSA-c29m-xwm3-cm6r
ecosystem: npm
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-28T17:48:43.428191Z'
cvssSource: cna
scores:
  cna: 8.2
  vendor: 7.5
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.

## Package advisory (CVE-2026-101903)

Affected packages:

- `axios >= 1.16.1, < 1.20.0`

Patched in:

- `axios 1.20.0`

Source: https://github.com/advisories/GHSA-c29m-xwm3-cm6r

## Vendor advisories

- **Red Hat VEX** · Important · affected: Red Hat Hardened Images · no fix planned: Red Hat Hardened Images · updated 2026-09-28 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-101903.json)
- **RHSA-2026:74871** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-10-02 · [advisory](https://access.redhat.com/errata/RHSA-2026:74871)
- **RHSA-2026:74869** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-10-02 · [advisory](https://access.redhat.com/errata/RHSA-2026:74869)
- **RHSA-2026:74872** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-10-02 · [advisory](https://access.redhat.com/errata/RHSA-2026:74872)