Axios up to 1.19.x HTTP/2 Request Setup http2.connect proxy/lookup access control

Summaryinfo

A vulnerability was found in Axios up to 1.19.x. It has been classified as critical. Affected by this issue is the function http2.connect of the component HTTP2 Request Setup. This manipulation of the argument proxy/lookup causes access control. This vulnerability is registered as CVE-2026-101898. Remote exploitation of the attack is possible. No exploit is available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability has been found in Axios up to 1.19.x and classified as critical. Affected by this vulnerability is the function http2.connect of the component HTTP2 Request Setup. The manipulation of the argument proxy/lookup with an unknown input leads to a access control vulnerability. The CWE definition for the vulnerability is CWE-284. The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

Axios is a promise-based HTTP client for the browser and Node.js. From 1.13.0 until 1.20.0, Axios HTTP/2 request setup does not consistently apply proxy settings and caller-supplied DNS lookup policy. An HTTPS request uses httpVersion: 2 with explicit config.proxy or environment-derived proxy settings, or relies on caller-supplied config.lookup DNS policy. The HTTP/2 path can connect without the configured proxy behavior or without applying the caller-supplied config.lookup policy before http2.connect(). Requests can bypass the intended proxy route or the caller-supplied DNS resolution policy. This issue is fixed in version 1.20.0.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-101898 since 09/28/2026. The exploitation appears to be easy. The attack can be launched remotely. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1068 according to MITRE ATT&CK.

Upgrading to version 1.20.0 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at CERT Bund (WID-SEC-2026-4056). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Affected

• Atlassian Bamboo
• Atlassian Bitbucket
• Atlassian Confluence
• Atlassian Crucible
• Atlassian Fisheye
• Atlassian Jira

Productinfo

Name

• Axios

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5
• 1.6
• 1.7
• 1.8
• 1.9
• 1.10
• 1.11
• 1.12
• 1.13
• 1.14
• 1.15
• 1.16
• 1.17
• 1.18
• 1.19

Website

• Product: https://github.com/axios/axios/

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Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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