Axios: Prototype Pollution Gadget in axios toFormData Options — GHSA-X97P-JQ2G-JP4F

Summary

## Summary Axios form serialization reads `visitor`, `maxDepth`, `dots`, `indexes`, `metaTokens`, and `Blob` from an internal options object without own-property guards. When `Object.prototype` has been polluted elsewhere in the same process, those inherited values can change how axios serializes multipart and URL-encoded request bodies. Axios does not create the prototype pollution source. This is a read-side…

Timeline

Published by source

2026-09-30

Risk context

• Reported severity or threat level: high.
• Reported CVSS score: 8.3 out of 10.
• Reported EPSS value: 0.00354.
• Review exposure for the affected product or family: npm: axios.

Product

npm: axios

What to do

General, cautious steps (verify details in the official source):

• Prioritize patching or mitigation immediately (treat as actively risky).
• Identify affected product versions in your inventory and verify whether you are impacted.
• Apply vendor patches/updates or recommended mitigations as soon as available.
• Read the official advisory for exact affected versions and remediation steps.

Official advisory

• Read the official source
• CVE Record
• NVD

Evidence and provenance

Canonical advisory ID

GHSA-X97P-JQ2G-JP4F

Source

GitHub

Vendor

GitHub

Published by source

2026-09-30

Last source activity

2026-09-30

Additional identifiers

CVE-2026-101909

Curated by

hlukh.ch

Related advisories and connections

These advisories are connected by shared CVE, product, vendor, source, or time signals.