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Vulnerability · Published Feb 9, 2026 · Assigned by GitHub_M

CVE-2026-25639Axios affected by Denial of Service via __proto__ Key in mergeConfig

High 7.5

In plain English

A high-severity security flaw in axios from axios. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 2.8% (higher than 86% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.5High
Exploit odds (30 days)2.8%top 13.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

Axios is a promise based HTTP client for the browser and Node.js. Prior to versions 0.30.3 and 1.13.5, the mergeConfig function in axios crashes with a TypeError when processing configuration objects containing __proto__ as an own property. An attacker can trigger this by providing a malicious configuration object created via JSON.parse(), causing complete denial of service. This vulnerability is fixed in versions 0.30.3 and 1.13.5.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12node-axiosno fix listedDEBIAN-CVE-2026-25639
Debian:13node-axiosno fix listedDEBIAN-CVE-2026-25639
Debian:14node-axios1.14.0+dfsg-1DEBIAN-CVE-2026-25639
Ubuntu:25.10node-axiosno fix listedUBUNTU-CVE-2026-25639
Ubuntu:26.10node-axiosno fix listedUBUNTU-CVE-2026-25639
npmaxios0.30.3GHSA-43fc-jf86-j433
npmaxios1.13.5GHSA-43fc-jf86-j433

Affected products (as reported)

VendorProductVersions
axios axios >= 1.0.0, < 1.13.5< 0.30.3

Weakness: CWE-754, CWE-1287 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References