Bug 2542579 (CVE-2026-101904)

Summary: CVE-2026-101904 axios: Axios: HTTP header injection via inherited prototype properties
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
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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. If a separate vulnerability modifies shared object properties (prototype pollution) in the application environment, Axios may inherit those properties when processing request configurations rebuilt without explicit headers. An attacker can exploit this condition to inject unauthorized HTTP headers into outgoing network requests. This issue can lead to improper request routing, access control bypasses, or downstream cache poisoning.
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Description OSIDB Bzimport 2026-09-28 17:46:05 UTC 
Axios is a promise-based HTTP client for the browser and Node.js. From 1.0.0 until 1.20.0, the dispatchRequest function normalizes inherited Object.prototype.headers from a replacement request configuration. A separate same-process prototype-pollution flaw sets Object.prototype.headers, and trusted request interceptors return a new ordinary configuration without an own headers property. After the interceptor chain, dispatchRequest resolves the inherited headers during normalization. Downstream request processing can observe attacker-controlled headers, including authorization-related values. This issue is fixed in version 1.20.0.