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 (1)
Core 1
Core References
Vendor Advisory x_refsource_confirm
https://github.com/axios/axios/security/advisories/GHSA-xhjh-pmcv-23jw
Scores
CVSS v3
3.7
EPSS
0.0020
EPSS Percentile
9.9%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
CISA SSVC
Vulnrichment
Exploitation
poc
Automatable
no
Technical Impact
partial
Details
CWE
CWE-116
CWE-626
Status
published
Products (3)
axios/axios
< 0.31.1 (2 CPE variants)
axios/axios
>= 1.0.0, < 1.15.1
npm/axios
1.0.0 - 1.15.1npm
Published
Apr 24, 2026
Tracked Since
Apr 24, 2026