CVE-2026-42038 MEDIUM

CVE-2026-42038: Axios: no_proxy bypass via IP alias allows SSRF

Vendor Axios
Product axios
Weakness CWE-918 · SSRF
Published April 24, 2026
Last update April 27, 2026

CVSS base score

6.8/10
Attack vector Network
Attack complexity High
Privileges required None
User interaction None
Confidentiality High
Integrity None

CVSS vector

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

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

April 24, 2026 CVE published
April 27, 2026 Record updated