Vulnerability Details CVE-2026-42035
Axios is a promise based HTTP client for the browser and Node.js. Prior to 1.15.1 and 0.31.1, a prototype pollution gadget exists in the Axios HTTP adapter (lib/adapters/http.js) that allows an attacker to inject arbitrary HTTP headers into outgoing requests. The vulnerability exploits duck-type checking of the data payload, where if Object.prototype is polluted with getHeaders, append, pipe, on, once, and Symbol.toStringTag, Axios misidentifies any plain object payload as a FormData instance and calls the attacker-controlled getHeaders() function, merging the returned headers into the outgoing request. The vulnerable code resides exclusively in lib/adapters/http.js. The prototype pollution source does not need to originate from Axios itself — any prototype pollution primitive in any dependency in the application's dependency tree is sufficient to trigger this gadget. This vulnerability is fixed in 1.15.1 and 0.31.1.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 9.7%
CVSS Severity
CVSS v3 Score 7.4
References
Products affected by CVE-2026-42035
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cpe:2.3:a:axios:axios:-
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cpe:2.3:a:axios:axios:0.1.0
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cpe:2.3:a:axios:axios:0.10.0
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cpe:2.3:a:axios:axios:0.11.0
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cpe:2.3:a:axios:axios:0.11.1
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cpe:2.3:a:axios:axios:0.12.0
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cpe:2.3:a:axios:axios:0.13.0
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cpe:2.3:a:axios:axios:0.13.1
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cpe:2.3:a:axios:axios:0.14.0
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cpe:2.3:a:axios:axios:0.15.0
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cpe:2.3:a:axios:axios:0.15.1
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cpe:2.3:a:axios:axios:0.15.2
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cpe:2.3:a:axios:axios:0.15.3
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cpe:2.3:a:axios:axios:0.16.0
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cpe:2.3:a:axios:axios:0.16.1
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cpe:2.3:a:axios:axios:0.16.2
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cpe:2.3:a:axios:axios:0.17.0
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cpe:2.3:a:axios:axios:0.17.1
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cpe:2.3:a:axios:axios:0.18.0
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cpe:2.3:a:axios:axios:0.18.1
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cpe:2.3:a:axios:axios:0.19.0
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cpe:2.3:a:axios:axios:0.19.1
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cpe:2.3:a:axios:axios:0.19.2
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cpe:2.3:a:axios:axios:0.2.0
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cpe:2.3:a:axios:axios:0.2.1
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cpe:2.3:a:axios:axios:0.2.2
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cpe:2.3:a:axios:axios:0.20.0
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cpe:2.3:a:axios:axios:0.21.0
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cpe:2.3:a:axios:axios:0.21.1
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cpe:2.3:a:axios:axios:0.21.2
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cpe:2.3:a:axios:axios:0.21.3
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cpe:2.3:a:axios:axios:0.21.4
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cpe:2.3:a:axios:axios:0.22.0
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cpe:2.3:a:axios:axios:0.23.0
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cpe:2.3:a:axios:axios:0.24.0
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cpe:2.3:a:axios:axios:0.25.0
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cpe:2.3:a:axios:axios:0.26.0
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cpe:2.3:a:axios:axios:0.26.1
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cpe:2.3:a:axios:axios:0.27.0
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cpe:2.3:a:axios:axios:0.27.1
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cpe:2.3:a:axios:axios:0.27.2
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cpe:2.3:a:axios:axios:0.28.0
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cpe:2.3:a:axios:axios:0.28.1
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cpe:2.3:a:axios:axios:0.29.0
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cpe:2.3:a:axios:axios:0.3.0
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cpe:2.3:a:axios:axios:0.3.1
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cpe:2.3:a:axios:axios:0.30.0
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cpe:2.3:a:axios:axios:0.30.1
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cpe:2.3:a:axios:axios:0.30.3
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cpe:2.3:a:axios:axios:0.4.0
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cpe:2.3:a:axios:axios:0.4.1
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cpe:2.3:a:axios:axios:0.4.2
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cpe:2.3:a:axios:axios:0.5.0
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cpe:2.3:a:axios:axios:0.5.1
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cpe:2.3:a:axios:axios:0.5.2
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cpe:2.3:a:axios:axios:0.5.3
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cpe:2.3:a:axios:axios:0.5.4
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cpe:2.3:a:axios:axios:0.6.0
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cpe:2.3:a:axios:axios:0.7.0
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cpe:2.3:a:axios:axios:0.8.0
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cpe:2.3:a:axios:axios:0.8.1
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cpe:2.3:a:axios:axios:0.9.0
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cpe:2.3:a:axios:axios:0.9.1
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cpe:2.3:a:axios:axios:1.0.0
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cpe:2.3:a:axios:axios:1.1.0
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cpe:2.3:a:axios:axios:1.1.1
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cpe:2.3:a:axios:axios:1.1.2
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cpe:2.3:a:axios:axios:1.1.3
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cpe:2.3:a:axios:axios:1.10.0
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cpe:2.3:a:axios:axios:1.11.0
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cpe:2.3:a:axios:axios:1.12.0
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cpe:2.3:a:axios:axios:1.12.1
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cpe:2.3:a:axios:axios:1.12.2
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cpe:2.3:a:axios:axios:1.13.0
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cpe:2.3:a:axios:axios:1.13.1
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cpe:2.3:a:axios:axios:1.13.2
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cpe:2.3:a:axios:axios:1.13.3
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cpe:2.3:a:axios:axios:1.13.4
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cpe:2.3:a:axios:axios:1.13.5
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cpe:2.3:a:axios:axios:1.13.6
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cpe:2.3:a:axios:axios:1.14.0
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cpe:2.3:a:axios:axios:1.15.0
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cpe:2.3:a:axios:axios:1.2.0
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cpe:2.3:a:axios:axios:1.2.1
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cpe:2.3:a:axios:axios:1.2.2
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cpe:2.3:a:axios:axios:1.2.3
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cpe:2.3:a:axios:axios:1.2.4
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cpe:2.3:a:axios:axios:1.2.5
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cpe:2.3:a:axios:axios:1.2.6
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cpe:2.3:a:axios:axios:1.3.0
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cpe:2.3:a:axios:axios:1.3.1
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cpe:2.3:a:axios:axios:1.3.2
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cpe:2.3:a:axios:axios:1.3.3
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cpe:2.3:a:axios:axios:1.3.4
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cpe:2.3:a:axios:axios:1.3.5
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cpe:2.3:a:axios:axios:1.3.6
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cpe:2.3:a:axios:axios:1.4.0
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cpe:2.3:a:axios:axios:1.5.0
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cpe:2.3:a:axios:axios:1.5.1
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cpe:2.3:a:axios:axios:1.6.0
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cpe:2.3:a:axios:axios:1.6.1
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cpe:2.3:a:axios:axios:1.6.2
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cpe:2.3:a:axios:axios:1.6.3
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cpe:2.3:a:axios:axios:1.6.4
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cpe:2.3:a:axios:axios:1.6.5
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cpe:2.3:a:axios:axios:1.6.6
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cpe:2.3:a:axios:axios:1.6.7
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cpe:2.3:a:axios:axios:1.6.8
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cpe:2.3:a:axios:axios:1.7.0
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cpe:2.3:a:axios:axios:1.7.1
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cpe:2.3:a:axios:axios:1.7.2
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cpe:2.3:a:axios:axios:1.7.3
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cpe:2.3:a:axios:axios:1.7.4
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cpe:2.3:a:axios:axios:1.7.5
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cpe:2.3:a:axios:axios:1.7.6
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cpe:2.3:a:axios:axios:1.7.7
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cpe:2.3:a:axios:axios:1.7.8
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cpe:2.3:a:axios:axios:1.7.9
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cpe:2.3:a:axios:axios:1.8.0
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cpe:2.3:a:axios:axios:1.8.1
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cpe:2.3:a:axios:axios:1.8.2
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cpe:2.3:a:axios:axios:1.8.3
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cpe:2.3:a:axios:axios:1.8.4
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cpe:2.3:a:axios:axios:1.9.0