Prototype pollution in axios - #VU136914
Published: July 6, 2026
Vulnerability identifier: #VU136914
CSH Severity: Low
CVSS v4: 5.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-1321
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to control URL serialization and disclose sensitive information.
The vulnerability exists due to improperly controlled modification of object prototype attributes in resolveConfig or browser-adapter helper paths when processing plain config objects after Object.prototype has already been polluted. A remote user can pollute Object.prototype.paramsSerializer to control URL serialization and disclose sensitive information.
This affects direct resolveConfig or browser-adapter helper usage with plain config objects that do not define their own paramsSerializer property.
Affected software
axios
Remediation
Install security update from vendor's website.
axios - addressed in versions 0.33.0, 1.18.0