Prototype pollution in axios - CVE-2026-42033
Published: April 24, 2026 / Updated: June 18, 2026
Vulnerability identifier: #VU127603
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-42033
CWE-ID: CWE-1321
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: axios
Affected software:
axios
axios
Detailed vulnerability description
The vulnerability allows a remote attacker to tamper with JSON responses and disclose sensitive information.
The vulnerability exists due to prototype pollution in parseReviver handling in the transformResponse functionality when processing JSON responses in a process where Object.prototype has been polluted by a co-dependency. A remote attacker can pollute Object.prototype.parseReviver to tamper with JSON responses and disclose sensitive information.
This issue affects the parseReviver gadget and requires a separate source of prototype pollution in the same process.
How to mitigate CVE-2026-42033
Install security update from vendor's website.