Axios is a promise based HTTP client for the browser and Node.js. Prior to 1.15.0 and 0.31.0, Axios does not correctly handle hostname normalization when checking NO_PROXY rules. Requests to loopback addresses like localhost. (with a trailing dot) or [::1] (IPv6 literal) skip NO_PROXY matching and go through the configured proxy. This goes against what developers expect and lets attackers force requests through a proxy, even if NO_PROXY is set up to protect loopback or internal services. This issue leads to the possibility of proxy bypass and SSRF vulnerabilities allowing attackers to reach sensitive loopback or internal services despite the configured protections. This vulnerability is fixed in 1.15.0 and 0.31.0.
https://github.com/axios/axios/security/advisories/GHSA-3p68-rc4w-qgx5
https://github.com/axios/axios/releases/tag/v1.15.0
https://github.com/axios/axios/releases/tag/v0.31.0
https://github.com/axios/axios/pull/10688
https://github.com/axios/axios/pull/10661
https://github.com/axios/axios/commit/fb3befb6daac6cad26b2e54094d0f2d9e47f24df
https://github.com/axios/axios/commit/03cdfc99e8db32a390e12128208b6778492cee9c
Published: 2026-04-09
Updated: 2026-04-16
Base Score: 9
Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:P/A:P
Severity: High
Base Score: 9.9
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:L
Severity: Critical
Base Score: 6.3
Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N
Severity: Medium
EPSS: 0.00015