Uncontrolled recursion in Underscore.js - CVE-2026-27601
Published: March 3, 2026
Vulnerability identifier: #VU123432
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-27601
CWE-ID: CWE-674
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Jeremy Ashkenas
Affected software:
Underscore.js
Underscore.js
Detailed vulnerability description
The vulnerability allows a remote attacker to perform a denial of service attack.
The vulnerability exists due to an uncontrolled recursion within the _.flatten() and _.isEqual() function. A remote attacker can pass specially crafted input to the application and perform a denial of service attack.
How to mitigate CVE-2026-27601
Install updates from vendor's website.