PT-2026-35044 · Axios · Axios

Published 2026-04-24 · Updated 2026-04-24 · CVE-2026-42040

Mitre

CVSS v3.1

3.7

Low

AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N

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.

Fix

Improper Encoding or Escaping of Output

Weakness Enumeration

CWE-116

CWE-626

Related Identifiers

CVE-2026-42040

Affected Products

Axios

References · 3

• https://nvd.nist.gov/vuln/detail/CVE-2026-42040 · Security Note
• https://github.com/axios/axios/security/advisories/GHSA-xhjh-pmcv-23jw · Note
• https://twitter.com/CVEnew/status/2047798593982271852 · Twitter Post