CVE-2026-25639
Published: 09 February 2026
Summary
CVE-2026-25639 is a high-severity Improper Check for Unusual or Exceptional Conditions (CWE-754) vulnerability in Axios Axios. Its CVSS base score is 7.5 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Application or System Exploitation (T1499.004); ranked at the 16.6th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.
Threat & Defense at a Glance
Threat & Defense Details
Likely Mitigating ControlsAI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
Requires detection and response to audit logging failures as an unusual or exceptional condition.
Implements detection of unusual or exceptional conditions followed by safe mode entry, reducing the window for exploitation of unchecked conditions.
Training ensures users perform required checks for unusual or exceptional conditions as part of contingency roles, limiting attacker leverage from skipped validations.
IR testing directly validates checks for unusual or exceptional conditions that could indicate security incidents.
Requires ongoing monitoring of organization-defined metrics and analysis, enabling checks for unusual or exceptional conditions.
Security testing routinely checks for unusual or exceptional inputs/conditions, identifying missing validation steps that flaw remediation then resolves.
Requires detection of unusual conditions followed by a controlled transition to the defined failure state.
MTTF determination forces explicit checks for conditions that precede predictable component failure.
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
CVE enables remote unauthenticated DoS via crafted config object triggering unhandled TypeError in Axios mergeConfig (CWE-754), directly matching application/system exploitation for endpoint denial of service.
NVD 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…
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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.
Deeper analysisAI
CVE-2026-25639 is a denial-of-service vulnerability in Axios, a promise-based HTTP client used in browsers and Node.js environments. The issue affects versions prior to 0.30.3 and 1.13.5, where the mergeConfig function throws a TypeError when processing configuration objects that include __proto__ as an own property. This flaw, classified under CWE-754 (Improper Check for Unusual or Exceptional Conditions), carries a CVSS v3.1 base score of 7.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).
An unauthenticated attacker over the network can exploit this vulnerability with low complexity and no user interaction by supplying a malicious configuration object, typically crafted via JSON.parse(). If an application passes such an object to axios's mergeConfig, it triggers a crash, resulting in complete denial of service for the affected application instance.
Mitigation is available through upgrading to Axios versions 0.30.3 or 1.13.5, which include fixes via specific commits and pull requests documented on GitHub, such as commit 28c721588c7a77e7503d0a434e016f852c597b57, commit d7ff1409c68168d3057fc3891f911b2b92616f9e, PR #7369, PR #7388, and the v0.30.3 release.
Details
- CWE(s)