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

Published Apr 24, 2026
·
Updated

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.

Affected Software

5 affected componentsFixes available
npm/axios<1.15.1, <0.31.1
Axios Axios Node.js<0.31.1
Axios Axios Node.js>=1.0.0<1.15.1
npm/axios<=0.31.0
0.31.1
npm/axios>=1.0.0<1.15.1
1.15.1

Event History

Apr 24, 2026
CVE Published
via MITRE·05:57 PM
Data Sourced
via MITRE·05:57 PM
DescriptionSeverityWeakness
Data Sourced
via NVD·06:16 PM
DescriptionSeverityWeaknessAffected Software
May 5, 2026
Advisory Published
via GitHub·12:40 AM
Data Sourced
via GitHub·12:40 AM
DescriptionSeverityWeaknessAffected Software
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Frequently Asked Questions

1

What is the severity of CVE-2026-42038?

CVE-2026-42038 has a medium severity rating due to its potential for allowing server-side request forgery (SSRF) attacks.

2

How do I fix CVE-2026-42038?

To fix CVE-2026-42038, upgrade Axios to version 1.15.1 or later, or 0.31.1 or later.

3

What systems are impacted by CVE-2026-42038?

CVE-2026-42038 impacts Axios versions prior to 1.15.1 and 0.31.1 on both browser and Node.js environments.

4

What does CVE-2026-42038 affect in Axios?

CVE-2026-42038 affects the no_proxy hostname normalization, allowing IP alias bypass that can lead to SSRF vulnerability.

5

Is there a workaround for CVE-2026-42038?

There is no official workaround for CVE-2026-42038; upgrading to the fixed versions is the recommended approach.

Company

Resources

Contact

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