Axios: no_proxy bypass via IP alias allows SSRF_CVE-2026-42038

6.8 / 10

MEDIUM

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N

Description

Axios is a promise based HTTP client for the browser and Node.js. Prior to 1.15.1 and 0.31.1, he fix for no_proxy hostname normalization bypass is incomplete. When no_proxy=localhost is set, requests to 127.0.0.1 and [::1] still route through the proxy instead of bypassing it. The shouldBypassProxy() function does pure string matching — it does not resolve IP aliases or loopback equivalents. This vulnerability is fixed in 1.15.1 and 0.31.1.

Basic Information

ID CVE-2026-42038

Source GitHub_M

Published Apr 24, 2026 at 17:57

Affected Product

Vendor axios

Product axios

Version >= 1.0.0, < 1.15.1

Affected Versions axios axios >= 1.0.0, < 1.15.1
axios axios < 0.31.1

CWE Classification

CWE-918

References

github.com /axios/axios/security/advisories/GHSA-m7pr-hjqh-92cm

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