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.
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Mon, 27 Apr 2026 20:15:00 +0000
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Axios
Axios axios |
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| CPEs | cpe:2.3:a:axios:axios:*:*:*:*:*:node.js:*:* | |
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Axios
Axios axios |
Mon, 27 Apr 2026 14:15:00 +0000
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ssvc
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Fri, 24 Apr 2026 18:00:00 +0000
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| 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. | |
| Title | Axios: Null Byte Injection via Reverse-Encoding in AxiosURLSearchParams | |
| Weaknesses | CWE-116 CWE-626 |
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cvssV3_1
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Status: PUBLISHED
Assigner: GitHub_M
Published: 2026-04-24T17:40:31.125Z
Updated: 2026-04-27T13:48:06.659Z
Reserved: 2026-04-23T16:05:01.709Z
Link: CVE-2026-42040
Updated: 2026-04-27T13:47:53.257Z
Status : Analyzed
Published: 2026-04-24T18:16:30.960
Modified: 2026-04-27T20:09:07.257
Link: CVE-2026-42040
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