CVE-2026-42264 axios CVE debrief

Who should care

Developers and security teams using Axios in Node.js and browser environments should assess exposure and update to version 1.15.2 or later. This vulnerability could impact the security of outbound HTTP requests.

Why it matters

CVE-2026-42264 is a high-severity vulnerability in Axios that allows for prototype pollution, potentially impacting outbound HTTP requests. Developers and security teams should assess exposure and update to version 1.15.2 or later.

• Verify Axios version and update to 1.15.2 or later to prevent potential exploitation
• Assess exposure in current Node.js and browser environments
• Monitor for potential exploitation attempts and review outbound HTTP requests for anomalies

Technical summary

Axios, a promise-based HTTP client for the browser and Node.js, is vulnerable to prototype pollution. From version 1.0.0 to before version 1.15.2, five config properties (auth, baseURL, socketPath, beforeRedirect, and insecureHTTPParser) are read via direct property access without hasOwnProperty guards. This allows attackers to pollute Object.prototype, potentially impacting outbound HTTP requests. The issue has been patched in version 1.15.2.

Defensive priority

High

Recommended defensive actions

• Review and update Axios to version 1.15.2 or later
• Assess exposure in Node.js and browser environments
• Monitor for potential exploitation attempts
• Verify Axios version and update to 1.15.2 or later to prevent potential exploitation
• Assess exposure in current Node.js and browser environments
• Monitor for potential exploitation attempts and review outbound HTTP requests for anomalies
• Track exceptions, retest remediated assets, and close the item only after evidence is documented

Evidence notes

The CVE record and NVD entry provide details on the vulnerability in Axios. The issue arises from Axios reading config properties without proper guards, allowing for prototype pollution. A patch is available in version 1.15.2.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.