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Security Advisories

CVE-2026-42040

NVD

https://nvd.nist.gov/vuln/detail/CVE-2026-42040

Severity

3.7

Low

CVSS V3

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Summary

Axios: Null Byte Injection via Reverse-Encoding in AxiosURLSearchParams

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.

References

  • https://nvd.nist.gov/vuln/detail/CVE-2026-42040
  • https://github.com/advisories/GHSA-xhjh-pmcv-23jw
  • https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42040.json
  • https://github.com/axios/axios/security/advisories/GHSA-xhjh-pmcv-23jw

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