CVE•Published 2026-04-24•Modified 2026-04-27•0 articles on news•6 live references•NVD data

CVE-2026-42040Axios · Axios

Vulnerability data via NVD (ingested)

CVSS v3.1

3.7

LOW

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N

EPSS percentile

Exploit Prediction Scoring System · top 92% of all CVEs

Weaknesses (CWE)

CWE-116Improper Encoding or Escaping of Output CWE-626Null Byte Interaction Error (Poison Null Byte)

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.

Timeline

Published 2026-04-24

Modified 2026-04-27

External references

NVD MITRE Exploit-DB GitHub PoC trickest/cve VulnCheck

Search for exposed instances

Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).

Shodan · vuln tag4,874 hosts

vuln:CVE-2026-42040

Hosts Shodan has explicitly fingerprinted as vulnerable.

Shodan · product

product:"Axios Axios"

All exposed Axios Axios instances — cross-reference with the CVE's affected-version range.

Shodan · banner/body mention

http.html:"Axios"

HTTP body or banner mentions "Axios" — catches deploys Shodan didn't identify as a product.

More intel sources (5)

Shodan report

vuln:CVE-2026-42040