Axios HTTP adapter proxy routing flaw (v0.31.1-0.32.9 & v1.15.2-1.17.9)
CVE-2026-67320 Published on August 1, 2026
axios before 0.33.0 Prototype Pollution via Node HTTP adapter
axios in a Node.js deployment using the HTTP adapter can route requests through an attacker-controlled proxy. axios hardens merged request configuration by creating a null-prototype object, but request interceptors run after the merge; a common immutable interceptor pattern such as {...config} or Object.assign({}, config) converts the hardened config back into a regular object. axios then dispatches that object without re-hardening it, and the Node HTTP adapter reads config.proxy through the prototype chain. If an attacker can pollute Object.prototype.proxy, affected requests can be routed through an attacker-controlled proxy. For plaintext HTTP requests, the proxy can observe Authorization headers, Basic auth from config.auth, method, absolute URL, Host, and request body, and can return its own response. This does not establish browser impact or HTTPS header/body disclosure under normal TLS validation. Affected versions are >=0.31.1 (fixed in 0.33.0) and >=1.15.2 (fixed in 1.18.0).
Vulnerability Analysis
CVE-2026-67320 is exploitable with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity and availability.
Weakness Type
What is an Information Disclosure Vulnerability?
The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.
CVE-2026-67320 has been classified to as an Information Disclosure vulnerability or weakness.
Products Associated with CVE-2026-67320
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Affected Versions
axios:- Version 0.31.1 and below 0.33.0 is affected.
- Version 0.33.0 is unaffected.
- Version 1.15.2 and below 1.18.0 is affected.
- Version 1.18.0 is unaffected.