{"cve":"CVE-2026-42035","nvd":{"published":"2026-04-24T18:16:30.273","modified":"2026-06-17T10:47:20.660","status":"Analyzed","description":"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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","score":7.4},"cwes":["CWE-113","CWE-1321"],"references":["https://github.com/axios/axios/security/advisories/GHSA-6chq-wfr3-2hj9","https://github.com/axios/axios/security/advisories/GHSA-6chq-wfr3-2hj9"],"products":["axios:axios"],"source":"nvd","synced_at":"2026-10-19T22:33:09.003606135+00:00"},"epss":{"cve":"CVE-2026-42035","score":0.00403,"percentile":0.3453,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-6chq-wfr3-2hj9","url":"https://osv.dev/vulnerability/GHSA-6chq-wfr3-2hj9","summary":"Axios: Header Injection via Prototype Pollution","modified":"2026-09-10T03:51:04.772235088Z","packages":[{"ecosystem":"npm","name":"axios","purl":"pkg:npm/axios","ranges":[">=1.0.0 <1.15.1"],"fixed":["1.15.1"]},{"ecosystem":"npm","name":"axios","purl":"pkg:npm/axios","ranges":["<0.31.1"],"fixed":["0.31.1"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}