Improper access control in axios - CVE-2026-42038
Published: April 24, 2026 / Updated: June 19, 2026
Vulnerability identifier: #VU127599
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-42038
CWE-ID: CWE-284
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: axios
Affected software:
axios
axios
Detailed vulnerability description
The vulnerability allows a remote attacker to disclose sensitive information.
The vulnerability exists due to improper access control in shouldBypassProxy() when processing URLs against no_proxy rules. A remote attacker can supply a URL using an IP alias instead of the hostname to disclose sensitive information.
In server-side environments, requests intended to bypass proxies can instead be routed through an attacker-controlled proxy. This can affect access to internal or cloud metadata services.
How to mitigate CVE-2026-42038
Install security update from vendor's website.