medium6.9
CVE-2026-101908
Axios: Prototype pollution gadget in fetch adapter can alter outbound requests
Impact
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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| npm | axios | >= 1.7.0, < 1.20.0 | 1.20.0 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-vh66-26gq-q6x8
- https://github.com/axios/axios/security/advisories/GHSA-vh66-26gq-q6x8
- https://nvd.nist.gov/vuln/detail/CVE-2026-101908
- https://github.com/axios/axios/pull/11141
- https://github.com/axios/axios/commit/d19040bda7a8be2f82c3c6e1a5bc03917daee39a
- https://github.com/axios/axios/releases/tag/v1.20.0