Prototype pollution in axios - CVE-2026-101909
Published: September 17, 2026 / Updated: September 29, 2026
Vulnerability identifier: #VU150715
CSH Severity: High
CVSS v4: 8.8 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-101909
CWE-ID: CWE-1321
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to alter serialized request data or cause a denial of service.
The vulnerability exists due to improper control of object prototype attributes in axios toFormData option handling when serializing multipart or URL-encoded form data. A remote attacker can trigger form-data serialization to alter serialized request data or cause a denial of service.
Exploitation requires Object.prototype to have been polluted elsewhere in the same process.
Affected software
axios
How to mitigate CVE-2026-101909
Install security update from vendor's website.
axios - addressed in versions 0.34.0, 1.20.0