CVE-2026-42040 (Low) detected in axios-0.21.4.tgz

[mend-bolt-for-github]

CVE-2026-42040 - Low Severity Vulnerability

Vulnerable Library - axios-0.21.4.tgz

Promise based HTTP client for the browser and node.js

Library home page: https://registry.npmjs.org/axios/-/axios-0.21.4.tgz

Path to dependency file: /package.json

Path to vulnerable library: /node_modules/axios/package.json

Dependency Hierarchy:

• ❌ axios-0.21.4.tgz (Vulnerable Library)

Found in base branch: main

Vulnerability Details

Axios is a promise based HTTP client for the browser and Node.js. Prior to 1.15.1 and 0.31.1, the encode() function in lib/helpers/AxiosURLSearchParams.js contains a character mapping (charMap) at line 21 that reverses the safe percent-encoding of null bytes. After encodeURIComponent('\x00') correctly produces the safe sequence %00, the charMap entry '%00': '\x00' converts it back to a raw null byte. Primary impact is limited because the standard axios request flow is not affected. This vulnerability is fixed in 1.15.1 and 0.31.1.

Publish Date: 2026-04-24

URL: CVE-2026-42040

CVSS 3 Score Details (3.7)

Base Score Metrics:

• Exploitability Metrics:
  • Attack Vector: Network
  • Attack Complexity: High
  • Privileges Required: None
  • User Interaction: None
  • Scope: Unchanged
• Impact Metrics:
  • Confidentiality Impact: None
  • Integrity Impact: Low
  • Availability Impact: None

For more information on CVSS3 Scores, click here.

Suggested Fix

Type: Upgrade version

Origin: GHSA-xhjh-pmcv-23jw

Release Date: 2026-04-24

Fix Resolution: 0.31.1

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