CVE-2026-101900: Axios

Medium severity, CVSS 6.9. EPSS: 0.5% chance of exploitation in the next 30 days.

Axios is a promise-based HTTP client for the browser and Node.js. From 1.12.0 until 1.20.0, ResolveConfig reads inherited Symbol.toStringTag, append, and getHeaders properties while resolving FormData headers. A separate same-process prototype-pollution flaw supplies an array or non-plain class instance whose inherited properties make it appear FormData-like; plain objects are blocked. The inherited getHeaders function can return attacker-controlled headers that resolveConfig merges into a fetch adapter request. Attacker-controlled headers can alter authorization, cache, metadata-service, or application-specific request behavior. This issue is fixed in version 1.20.0.

Affected products

• Axios Axios: from 1.12.0, before 1.20.0 (fixed in 1.20.0)

Published 2026-09-28. Last modified 2026-09-30.