CVE-2026-42043 Axios: Incomplete Fix for CVE-2025-62718 — NO_PROXY Protection Bypassed via RFC 1122 Loopback Subnet (127.0.0.0/8) in Axios 1.15.0

What is CVE-2026-42043?

CVE-2026-42043 is a high-severity vulnerability in axios, published on 24 Apr 2026.

Official description

Axios is a promise based HTTP client for the browser and Node.js. Prior to 1.15.1 and 0.31.1, an attacker who can influence the target URL of an Axios request can use any address in the 127.0.0.0/8 range (other than 127.0.0.1) to completely bypass the NO_PROXY protection. This vulnerability is due to an incomplete for CVE-2025-62718, This vulnerability is fixed in 1.15.1 and 0.31.1.

Weakness: CWE-918, CWE-441, CWE-183

Which versions are affected by CVE-2026-42043?

4 open source packages ship an affected version, including axios. It affects 1 product.

Products include Axios Axios.

How do I fix CVE-2026-42043?

Upgrade axios to a fixed version for your release line: 0.31.1 or 1.15.1.

Is CVE-2026-42043 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-42043 exists.

Other vulnerabilities in axios

• CVE-2026-44494 Axios: Full Man-in-the-Middle via Prototype Pollution Gadget in `config.proxy` High 8.7
• CVE-2026-44492 axios's shouldBypassProxy does not recognize IPv4-mapped IPv6 addresses, allowing NO_PROXY bypass (incomplete fix for CVE-2025-62718) High 8.6
• CVE-2026-67320 axios before 0.33.0 Prototype Pollution via Node HTTP adapter High 8.3
• CVE-2026-44487 Axios: Proxy-Authorization Credential Leak to Origin Server Across HTTP-to-HTTPS Redirect in Axios Node.js HTTP Adapter High 8.2
• CVE-2025-27152 Possible SSRF and Credential Leakage via Absolute URL in axios Requests High 7.7

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as CLEANSTART-2026-RL17852, CLEANSTART-2026-VV02167, CLEANSTART-2026-WS59650, DEBIAN-CVE-2026-42043, ECHO-fce3-8e6c-9959, GHSA-pmwg-cvhr-8vh7 and 21 more.