CVE-2026-25639 axios CVE debrief

Who should care

Defenders managing systems that use Axios for HTTP requests should assess exposure and prioritize updates to prevent denial-of-service attacks. This includes reviewing configuration object handling, validating __proto__ properties, and ensuring systems are updated to versions 0.30.3 or 1.13.5. Security teams should track exceptions, retest remediated assets, and close the item only after evidence is documented. Operators and platform administrators should

Why it matters

CVE-2026-25639 is a high-severity vulnerability in Axios that can lead to denial of service. Defenders should update Axios versions and validate configuration objects to prevent exploitation.

• Denial of service through configuration object manipulation
• Potential for service disruption
• Need for version updates to 0.30.3 or 1.13.5
• Configuration object validation required

Technical summary

The mergeConfig function in Axios crashes with a TypeError when processing configuration objects containing __proto__ as an own property. This can be exploited by providing a malicious configuration object created via JSON.parse(). The vulnerability is fixed in versions 0.30.3 and 1.13.5, and defenders should update Axios versions and validate configuration objects to prevent exploitation. Affected systems should be reviewed for exposure, especially those handling untrusted configuration objects. The vulnerability has a high severity score of 7.5 and can lead to complete denial of service.

Defensive priority

Defenders should prioritize updating Axios to versions 0.30.3 or 1.13.5 to prevent denial-of-service attacks. Systems using Axios for HTTP requests should be reviewed for exposure, especially those handling untrusted configuration objects.

Recommended defensive actions

• Update Axios to version 0.30.3 or 1.13.5
• Review systems using Axios for HTTP requests
• Validate configuration objects for __proto__ properties
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed.
• Review compensating controls for exposed systems while remediation is scheduled and verified.
• Check relevant monitoring, detection, and logs for exposed assets that need extra review.

Evidence notes

The CVE record and NVD detail provide information on the vulnerability and its fixes. Official references from GitHub and Red Hat offer additional context and patches. Defenders should verify affected systems, review configuration object handling, and assess potential exposure to denial-of-service attacks. Evidence limits suggest focusing on vendor guidance and configuration validation.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.