Is CVE-2026-101909 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-101909 being exploited in the wild.

How severe is CVE-2026-101909?

High severity, with a CVSS score of 4, published 28 September 2026.

Which products and versions are affected?

Axios 0.28.0 to 0.34.0, 1.15.1 to 1.20.0; axios (npm) SEMVER:introduced=0.28.0,fixed=0.34.0.

Is there a fix for CVE-2026-101909?

Yes. axios (npm): upgrade to 0.34.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-101909 attacked?

It is attacked with local access, in a software library.

Am I affected by CVE-2026-101909?

Check whether you run Axios or axios (npm) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-101909: Axios prototype pollution in ToFormData

CVE-2026-101909 · Severity: high · CVSS 4 · Published 2026-09-28

Axios is an HTTP client library used by JavaScript applications in browsers and Node.js to send network requests. A prototype pollution vulnerability allows an attacker who can already inject malicious code to manipulate serialization behavior, causing requests to fail or data to be interpreted incorrectly. The attack requires prior ability to pollute the JavaScript prototype chain, making it a secondary vulnerability risk in applications already compromised through another means.

Technologies: Axios, axios (npm). Vendors: Axios, npm.

Quick answers

Is CVE-2026-101909 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-101909 being exploited in the wild.
How severe is CVE-2026-101909?: High severity, with a CVSS score of 4, published 28 September 2026.
Which products and versions are affected?: Axios 0.28.0 to 0.34.0, 1.15.1 to 1.20.0; axios (npm) SEMVER:introduced=0.28.0,fixed=0.34.0.
Is there a fix for CVE-2026-101909?: Yes. axios (npm): upgrade to 0.34.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-101909 attacked?: It is attacked with local access, in a software library.
Am I affected by CVE-2026-101909?: Check whether you run Axios or axios (npm) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

axios (npm): upgrade to 0.34.0 or later
```
npm install axios@0.34.0
```

Technical details

The ToFormData function in Axios 0.28.0–0.34.0 and 1.15.1–1.20.0 inherits serialization options (visitor, maxDepth, Blob handling) from the prototype chain, allowing an attacker with prototype-pollution capability to alter form data field naming, trigger request failures via maxDepth constraints, or corrupt value handling. The vulnerability requires a separate prototype-pollution entry point to set inherited properties; the attacker cannot directly inject functions but can modify inherited settings that affect serialization behavior. Fixed in versions 0.34.0 and 1.20.0.

Affected products

Axios Axios 0.28.0 to 0.34.0, 1.15.1 to 1.20.0

Identifiers

CVE-2026-101909
GHSA-x97p-jq2g-jp4f

Timeline

2026-09-28: disclosed

References

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