{"id":"CVE-2026-42035","sourceIdentifier":"security-advisories@github.com","published":"2026-04-24T18:16:30.273","lastModified":"2026-11-11T23:10:00.263","vulnStatus":"Analyzed","cveTags":[],"descriptions":[{"lang":"en","value":"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."},{"lang":"es","value":"Axios es un cliente HTTP basado en promesas para el navegador y Node.js. Antes de 1.15.1 y 0.31.1, existe un ’gadget’ de contaminación de prototipos en el adaptador HTTP de Axios (lib/adapters/http.js) que permite a un atacante inyectar encabezados HTTP arbitrarios en las solicitudes salientes. La vulnerabilidad explota la verificación de tipo ’duck-type’ de la carga útil de datos, donde si Object.prototype se contamina con getHeaders, append, pipe, on, once y Symbol.toStringTag, Axios identifica erróneamente cualquier carga útil de objeto simple como una instancia de FormData y llama a la función getHeaders() controlada por el atacante, fusionando los encabezados devueltos en la solicitud saliente. El código vulnerable reside exclusivamente en lib/adapters/http.js. La fuente de contaminación de prototipos no necesita originarse de Axios mismo - cualquier primitiva de contaminación de prototipos en cualquier dependencia en el árbol de dependencias de la aplicación es suficiente para activar este ’gadget’. Esta vulnerabilidad está corregida en 1.15.1 y 0.31.1."}],"affected":[{"source":"security-advisories@github.com","affectedData":[{"vendor":"axios","product":"axios","versions":[{"version":">= 1.0.0, < 1.15.1","status":"affected"},{"version":"< 0.31.1","status":"affected"}]}]}],"metrics":{"cvssMetricV31":[{"source":"security-advisories@github.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","baseScore":7.4,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"HIGH","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"NONE"},"exploitabilityScore":2.2,"impactScore":5.2}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-04-24T00:00:00+00:00","id":"CVE-2026-42035","options":[{"exploitation":"poc"},{"automatable":"no"},{"technicalImpact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"weaknesses":[{"source":"security-advisories@github.com","type":"Secondary","description":[{"lang":"en","value":"CWE-113"},{"lang":"en","value":"CWE-1321"}]}],"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:axios:axios:*:*:*:*:*:node.js:*:*","versionEndExcluding":"0.31.1","matchCriteriaId":"7D2B28C9-026E-4CD6-BD17-7EDD42108106"},{"vulnerable":true,"criteria":"cpe:2.3:a:axios:axios:*:*:*:*:*:node.js:*:*","versionStartIncluding":"1.0.0","versionEndExcluding":"1.15.1","matchCriteriaId":"3EC1EF30-EBB8-410B-90FB-1F18A3545C2E"}]}]}],"references":[{"url":"https://github.com/axios/axios/security/advisories/GHSA-6chq-wfr3-2hj9","source":"security-advisories@github.com","tags":["Exploit","Mitigation","Vendor Advisory"]},{"url":"https://github.com/axios/axios/security/advisories/GHSA-6chq-wfr3-2hj9","source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","tags":["Exploit","Mitigation","Vendor Advisory"]}]}