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    CVE-2026-42040

    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.

    Published:Apr 24, 2026
    Last Modified:Apr 27, 2026
    EPS:Apr 24, 2026
    EPSS Score:0.00029
    CVSS Score:3.7

    Affected Products

    Vendor
    Axios
    Product
    Axios

    Exploits

    https://github.com/axios/axios/security/advisories/GHSA-xhjh-pmcv-23jwhttps://github.com/axios/axios/security/advisories/GHSA-xhjh-pmcv-23jw

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    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High