Vulnerability · Published Apr 24, 2026 · Assigned by GitHub_M
CVE-2026-42042Axios: XSRF Token Cross-Origin Leakage via Prototype Pollution Gadget in `withXSRFToken` Boolean Coercion
Medium 5.4
In plain English
A medium-severity security flaw in axios from axios. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 11% 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, the Axios library's XSRF token protection logic uses JavaScript truthy/falsy semantics instead of strict boolean comparison for the withXSRFToken config property. When this property is set to any truthy non-boolean value (via prototype pollution or misconfiguration), the same-origin check (isURLSameOrigin) is short-circuited, causing XSRF tokens to be sent to all request targets including cross-origin servers controlled by an attacker. 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-2026-42042 |
| Debian:13 | node-axios | no fix listed | DEBIAN-CVE-2026-42042 |
| Debian:14 | node-axios | 1.15.2-1 | DEBIAN-CVE-2026-42042 |
| Ubuntu:25.10 | node-axios | no fix listed | UBUNTU-CVE-2026-42042 |
| Ubuntu:26.10 | node-axios | no fix listed | UBUNTU-CVE-2026-42042 |
| npm | axios | 0.31.1 | GHSA-xx6v-rp6x-q39c |
| npm | axios | 1.15.1 | GHSA-xx6v-rp6x-q39c |
Affected products (as reported)
Weakness: CWE-183, CWE-201 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
References
- https://github.com/axios/axios/security/advisories/GHSA-xx6v-rp6x-q39c x_refsource_CONFIRM