Axios NO_PROXY bypass for 0.0.0.0 local addresses

Severity: high · CVSS 7.5 · Published 2026-08-01

Axios is a popular Node.js HTTP client library used to make web requests in server-side applications. When applications configure HTTP proxies with NO_PROXY rules to exclude local traffic (e.g., localhost, 127.0.0.1), axios incorrectly routes requests to 0.0.0.0 through the proxy instead of bypassing it. An attacker who controls a URL or redirect target in an axios request can exploit this to expose local services or cause the proxy to access internal systems, potentially leading to data exposure or SSRF attacks.

Quick answers

Is This vulnerability exploited in the wild?
No. Junglewise Threat Intelligence has no report of This vulnerability being exploited in the wild.
How severe is This vulnerability?
High severity, with a CVSS score of 7.5, published 1 August 2026.
Which products and versions are affected?
axios axios >=1.15.0, <1.18.0; >=0.31.0, <0.33.0.
Is there a fix for This vulnerability?
A patch was published on 2026-08-01: Patches available: axios 1.18.0 and 0.33.0 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is This vulnerability attacked?
It is attacked over the network, in a software library.
Am I affected?
Check whether anything you run is named in the advisory. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

This is an incomplete loopback-address validation vulnerability (CWE-183) in the isLoopback() function within lib/helpers/shouldBypassProxy.js. The vulnerable component incorrectly identifies which addresses should bypass proxy rules; it recognizes localhost, 127.0.0.0/8, and ::1 as loopback, but fails to include 0.0.0.0 (the IPv4 unspecified address). In Node.js, 0.0.0.0 routes to the local machine, but the WHATWG URL parser does not normalize it to 127.0.0.1 as it does with octal (0177.0.0.1), decimal (2130706433), or hexadecimal (0x7f000001) loopback forms. The attack requires an attacker to influence the request URL or redirect target and relies on the configured proxy being able to reach or relay requests to 0.0.0.0. Axios 1.18.0 and 0.33.0 patch the vulnerability by including 0.0.0.0 in the loopback address check. This affects only the Node.js HTTP adapter; browser, React Native, XHR, and fetch adapters are not impacted.

Affected products

  • axios axios >=1.15.0, <1.18.0; >=0.31.0, <0.33.0

Timeline

  • 2026-07-06: disclosed: Original advisory GHSA-f4gw-2p7v-4548 published
  • 2026-08-01: advisory: Duplicate advisory GHSA-6hqm-hm2v-3p2p published; NVD entry added for CVE-2026-67315
  • 2026-08-01: patched: Patches available: axios 1.18.0 and 0.33.0
  • 2026-09-01: other: GHSA-6hqm-hm2v-3p2p withdrawn as duplicate of GHSA-f4gw-2p7v-4548

References

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