What’s Vulnerable › Vulnerabilities

CVE-2026-44489: Axios: Proxy-Authorization Header Injection via Prototype Pollution — Incomplete Null-Prototype Fix

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-06-11 · updated 2026-06-17
• Weakness: CWE-113

Description

Axios is a promise based HTTP client for the browser and Node.js. From 1.15.2 to before 1.16.0, nested objects created by utils.merge() (e.g., config.proxy) are still constructed as plain {} with Object.prototype in their chain. The setProxy() function at lib/adapters/http.js:209-223 reads proxy.username, proxy.password, and proxy.auth without hasOwnProperty checks. When Object.prototype.username is polluted, setProxy() constructs a Proxy-Authorization header with attacker-controlled credentials and injects it into every proxied HTTP request. This vulnerability is fixed in 1.16.0.

Affected products

• axios: 1.15.2

References

• https://github.com/axios/axios/security/advisories/GHSA-654m-c8p4-x5fp
• https://github.com/axios/axios/security/advisories/GHSA-654m-c8p4-x5fp

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