Npm · Axios · CVE-2026-101900
**Name of the Vulnerable Software and Affected Versions**
Axios versions 1.12.0 through 1.19.x
**Description**
While resolving FormData headers, the `ResolveConfig` function reads inherited `Symbol.toStringTag`, `append`, and `getHeaders` properties. A prototype pollution flaw allows an attacker to provide an array or non-plain class instance that mimics FormData. Consequently, the inherited `getHeaders()` function can return attacker-controlled headers that are merged into a fetch adapter request, potentially altering authorization, cache, metadata-service, or application-specific request behavior.
**Recommendations**
Update to version 1.20.0.