Axios is a promise-based HTTP client for the browser and Node.js. From 1.7.0 until 1.20.0, the fetch adapter constructs a Request with sanitized resolvedOptions but then calls fetch with the original fetchOptions. A separate same-process prototype-pollution flaw populates Object.prototype.headers so fetchOptions.headers resolves through inheritance.
The inherited fetchOptions.headers value overrides the sanitized Request headers through the second argument to fetch after Request construction. Attacker-controlled request headers can alter authorization, caching, metadata-service access, or application-specific behavior. This issue is fixed in version 1.20.0.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
Present
Additional conditions required
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
None
No data leak
Integrity
None
No data modification
Availability
None
No disruption
CVSS Vector v4.0
Weakness Type (CWE)
Vulnerable Products
axios:axios
References 4
https://github.com/axios/axios/commit/d19040bda7a8be2f82c3c6e1a5bc03917daee39a
security-advisories@github.com
https://github.com/axios/axios/pull/11141
security-advisories@github.com
https://github.com/axios/axios/releases/tag/v1.20.0
security-advisories@github.com
https://github.com/axios/axios/security/advisories/GHSA-vh66-26gq-q6x8
security-advisories@github.com