Bug 2542592 (CVE-2026-101908)

Summary: CVE-2026-101908 axios: Axios: Outbound HTTP request manipulation via fetch adapter prototype pollution
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
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Priority: medium    
Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in Axios. When using the fetch adapter, Axios fails to properly isolate request configuration options from inherited object properties. If an attacker first exploits a separate prototype pollution vulnerability (where shared JavaScript object properties are modified) within the application, the fetch adapter can inherit those manipulated headers into outbound network calls. This allows an attacker to alter outgoing requests, potentially bypassing authorization controls, corrupting cache behavior, or accessing restricted internal services.
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Description OSIDB Bzimport 2026-09-28 17:57:44 UTC 
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.