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HIGH

CVE-2026-25639

Axios affected by Denial of Service via __proto__ Key in mergeConfig

CVSS v3

7.5

HIGH

EPSS Score

1.8 %

exploit probability, as of 2026-09-25

CISA KEV

No

known exploited

Exploitation

none

SSVC status

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.

Technical details

Published
2026-02-09
Last Modified
2026-02-18

Frequently asked questions

What is CVE-2026-25639?

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.

Is CVE-2026-25639 actively exploited?

Active exploitation of CVE-2026-25639 has not been confirmed. Its EPSS score was 1.8% on 2026-09-25, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-25639?

CVE-2026-25639 has a CVSS v3 base score of 7.5 (HIGH severity).

Is CVE-2026-25639 affecting your environment?

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