Vulnerability · Published Sep 28, 2026 · Assigned by GitHub_M
CVE-2026-101900Axios: Fetch Adapter Header Injection via Inherited FormData getHeaders
Medium 6.9
In plain English
A medium-severity injection in axios from axios. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 46% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
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 packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:13 | node-axios | no fix listed | DEBIAN-CVE-2026-101900 |
| Debian:14 | node-axios | 1.20.0-1 | DEBIAN-CVE-2026-101900 |
| Ubuntu:26.10 | node-axios | no fix listed | UBUNTU-CVE-2026-101900 |
| npm | axios | 1.20.0 | GHSA-4hqw-qxg8-jxx2 |
Affected products (as reported)
Weakness: CWE-74, CWE-693, CWE-1321 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:H/SA:N
References
- https://github.com/axios/axios/security/advisories/GHSA-4hqw-qxg8-jxx2 x_refsource_CONFIRM
- https://github.com/axios/axios/pull/11141 x_refsource_MISC
- https://github.com/axios/axios/commit/d19040bda7a8be2f82c3c6e1a5bc03917daee39a x_refsource_MISC
- https://github.com/axios/axios/releases/tag/v1.20.0 x_refsource_MISC