# CVE-2026-42040

## Summary

- **CVE ID:** CVE-2026-42040
- **Severity:** LOW
- **CVSS Score:** 3.7 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N)
- **CWE:** CWE-116, CWE-626
- **Published:** Apr 24, 2026
- **Last Modified:** Apr 27, 2026

## Description

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.

## Affected Products

- axios — axios (>= 1.0.0, < 1.15.1)
- axios — axios (< 0.31.1)

## References

- [CNA](https://github.com/axios/axios/security/advisories/GHSA-xhjh-pmcv-23jw)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.22%
- **EPSS Percentile:** 12.1

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._