7.5

CVSS Score

3.1

-

CVSS Score

Basic Information

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CVE-2026-25639

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

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.

(GitHub Advisory)

Miggo Vulnerability Database

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CVE-2026-25639

CVE-2026-25639:

7.5

CVSS Score

3.1

-

CVSS Score

Basic Information

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Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
axios	npm	>= 1.0.0, <= 1.13.4	1.13.5
axios	npm	<= 0.30.2	0.30.3

Technical Details

Vulnerability Intelligence
Miggo AI

Root Cause Analysis

The analysis of the vulnerability, confirmed by the provided description, PoC, and commit patch, pinpoints the mergeConfig function in lib/core/mergeConfig.js as the source of the Denial of Service vulnerability. The stack trace from the PoC explicitly shows the crash originating from within mergeConfig. The patch 28c721588c7a77e7503d0a434e016f852c597b57 directly mitigates this by adding a check to ignore hazardous property names like __proto__, constructor, and prototype during the configuration merge process. The vulnerable code was the loop that processed these properties without filtering, leading to an attempt to execute a non-function object, causing the application to crash.

Vulnerable functions

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WAF Protection Rules

WAF Rule

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Reasoning

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