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Historical advisory recorded 23 Oct 2026 15:48:27 UTC. Read the latest advisory.
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.
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Shown as published. These rules are not interpreted as NuGet package version ranges.
{
"vendor": "axios",
"product": "axios",
"versions": [
{
"version": ">= 1.7.0, < 1.20.0",
"status": "affected"
}
]
}Original source record · Cite this exact observation · Complete original publisher JSON