Inefficient regular expression complexity in axios - CVE-2026-101906
Published: September 17, 2026 / Updated: September 29, 2026
Vulnerability identifier: #VU150716
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-101906
CWE-ID: CWE-1333
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to inefficient regular expression complexity in the shouldBypassProxy hostname normalization function when processing a crafted hostname in an untrusted redirect Location. A remote attacker can send a redirect response with a crafted Location header to cause a denial of service.
Exploitation requires the Node.js HTTP adapter to use environment proxy handling with a non-empty NO_PROXY or no_proxy value while redirects are followed.
Affected software
axios
How to mitigate CVE-2026-101906
Install security update from vendor's website.
axios - update to 1.20.0