Axios <1.13.5 mergeConfig Crash DDoS
CVE-2026-25639 Published on February 9, 2026
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 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 1.13.5.
Vulnerability Analysis
CVE-2026-25639 can be exploited with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a high impact on availability.
Weakness Type
Improper Check for Unusual or Exceptional Conditions
The software does not check or incorrectly checks for unusual or exceptional conditions that are not expected to occur frequently during day to day operation of the software.
Products Associated with CVE-2026-25639
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Affected Versions
axios:- Version >= 1.0.0, < 1.13.5 is affected.
- Version < 0.30.3 is affected.
Vulnerable Packages
The following package name and versions may be associated with CVE-2026-25639
| Package Manager | Vulnerable Package | Versions | Fixed In |
|---|---|---|---|
| npm | axios | >= 1.0.0, <= 1.13.4 | 1.13.5 |
| npm | axios | <= 0.30.2 | 0.30.3 |
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.