Vulnerability · Published Apr 24, 2026 · Assigned by GitHub_M
CVE-2026-42035Axios: Header Injection via Prototype Pollution
High 7.4
In plain English
A high-severity prototype pollution in axios from axios. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 35% 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. Prior to 1.15.1 and 0.31.1, a prototype pollution gadget exists in the Axios HTTP adapter (lib/adapters/http.js) that allows an attacker to inject arbitrary HTTP headers into outgoing requests. The vulnerability exploits duck-type checking of the data payload, where if Object.prototype is polluted with getHeaders, append, pipe, on, once, and Symbol.toStringTag, Axios misidentifies any plain object payload as a FormData instance and calls the attacker-controlled getHeaders() function, merging the returned headers into the outgoing request. The vulnerable code resides exclusively in lib/adapters/http.js. The prototype pollution source does not need to originate from Axios itself — any prototype pollution primitive in any dependency in the application's dependency tree is sufficient to trigger this gadget. This vulnerability is fixed in 1.15.1 and 0.31.1.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | node-axios | no fix listed | DEBIAN-CVE-2026-42035 |
| Debian:13 | node-axios | no fix listed | DEBIAN-CVE-2026-42035 |
| Debian:14 | node-axios | 1.15.2-1 | DEBIAN-CVE-2026-42035 |
| Ubuntu:25.10 | node-axios | no fix listed | UBUNTU-CVE-2026-42035 |
| Ubuntu:26.10 | node-axios | no fix listed | UBUNTU-CVE-2026-42035 |
| npm | axios | 0.31.1 | GHSA-6chq-wfr3-2hj9 |
| npm | axios | 1.15.1 | GHSA-6chq-wfr3-2hj9 |
Affected products (as reported)
Weakness: CWE-113, CWE-1321 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
References
- https://github.com/axios/axios/security/advisories/GHSA-6chq-wfr3-2hj9 x_refsource_CONFIRM