CVE-2026-40175: Axios has Unrestricted Cloud Metadata Exfiltration via Header Injection Chain

Severity: medium (CVSS 4.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.9% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2026-04-10 · updated 2026-09-09
Weakness: CWE-113

Description

Axios is a promise based HTTP client for the browser and Node.js. Versions prior to 1.15.0 and 0.3.1 are vulnerable to a specific gadget-style attack chain in which prototype pollution in a third-party dependency may be leveraged to inject unsanitized header values into outbound requests. This vulnerability is fixed in 1.15.0 and 0.3.1.

Affected products

axios: before 0.31.0; from 1.0.0 before 1.15.0 — fixed in 0.31.0, 1.15.0
Npm Axios: from 1.0.0 before 1.15.0; before 0.31.0 — fixed in 1.15.0, 0.31.0

How to fix

Upgrade to a fixed version: axios 0.31.0, 1.15.0; Npm Axios 1.15.0, 0.31.0. Check the vendor advisory for mitigations.

References

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