Vulnerability · Published Sep 28, 2026 · Assigned by GitHub_M

CVE-2026-101909Axios: Prototype Pollution Gadget in axios toFormData Options

High 8.3

In plain English

A high-severity prototype pollution in axios from axios. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 43% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)8.3High

Exploit odds (30 days)0.5%top 57.2% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

Axios is a promise-based HTTP client for the browser and Node.js. From 0.28.0 until 0.34.0 and 1.15.1 until 1.20.0, ToFormData processes inherited serialization options and visitor properties supplied through prototype pollution. A separate same-process prototype-pollution flaw supplies inherited dots, indexes, metaTokens, maxDepth, visitor, or Blob values before object serialization. The inherited options alter toFormData field naming and data interpretation, maxDepth can force request failure, Blob changes value handling, and a polluted visitor can execute when an attacker already has the stronger ability to inject a function. Serialized field naming and data interpretation can change, maxDepth can cause request failure, Blob can alter value handling, and a polluted visitor can execute under the stronger function-injection primitive. This issue is fixed in versions 0.34.0 and 1.20.0.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Debian:12	node-axios	no fix listed	DEBIAN-CVE-2026-101909
Debian:13	node-axios	no fix listed	DEBIAN-CVE-2026-101909
Debian:14	node-axios	1.20.0-1	DEBIAN-CVE-2026-101909
Ubuntu:26.10	node-axios	no fix listed	UBUNTU-CVE-2026-101909
npm	axios	0.34.0	GHSA-x97p-jq2g-jp4f
npm	axios	1.20.0	GHSA-x97p-jq2g-jp4f

Affected products (as reported)

Vendor	Product	Versions
axios	axios	>= 1.15.1, < 1.20.0>= 0.28.0, < 0.34.0

Weakness: CWE-1321 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N

References

https://github.com/axios/axios/security/advisories/GHSA-x97p-jq2g-jp4f x_refsource_CONFIRM
https://github.com/axios/axios/pull/11141 x_refsource_MISC
https://github.com/axios/axios/commit/d19040bda7a8be2f82c3c6e1a5bc03917daee39a x_refsource_MISC
https://github.com/axios/axios/commit/d29be181f85f6fe93397a07b1f69606d9622637b x_refsource_MISC
https://github.com/axios/axios/releases/tag/v0.34.0 x_refsource_MISC
https://github.com/axios/axios/releases/tag/v1.20.0 x_refsource_MISC