CVE-2026-42040

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.

The following products are affected by CVE-2026-42040 vulnerability.

Here, you will find a curated list of external links that provide in-depth information to CVE-2026-42040.

URL	Resource
https://github.com/axios/axios/security/advisories/GHSA-xhjh-pmcv-23jw