Axios: Prototype pollution gadget in fetch adapter can alter outbound requests — GHSA-VH66-26GQ-Q6X8

Summary

## Summary Axios fetch adapter requests can be altered by inherited properties on `fetchOptions`. The adapter resolves method, headers, body, signal, and credentials into `resolvedOptions`, creates a `Request`, and then calls `fetch(request, fetchOptions)` instead of `fetch(request, resolvedOptions)`. In runtimes such as Node's undici-backed fetch, inherited `fetchOptions.headers` can override the headers already…

Timeline

Published by source

2026-09-30

Risk context

• Reported severity or threat level: medium.
• Reported CVSS score: 6.9 out of 10.
• Reported EPSS value: 0.00413.
• 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):

• Review exposure and plan remediation based on risk and environment.
• 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-VH66-26GQ-Q6X8

Source

GitHub

Vendor

GitHub

Published by source

2026-09-30

Last source activity

2026-09-30

Additional identifiers

CVE-2026-101908

Curated by

hlukh.ch

Related advisories and connections

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