CVE-2026-42040
Low
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.
SeverityLow
CVSS3.7
Exploit probability—
Product
Axios
PublishedApr 24, 2026
First seenApr 24, 2026
Weakness typeCWE-116CWE-116CWE-626CWE-626
How to fix
Update
- axios axios0.31.1, 1.15.1 or later
- axios1.15.1, 0.31.1 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| axios axios | v < 0.31.1, 1.0.0 ≤ v < 1.15.1 | 0.31.1, 1.15.1 |
| axiosnpm | 1.0.0 ≤ v < 1.15.1, v < 0.31.1 | 1.15.1, 0.31.1 |
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