CVE-2025-66020 HIGH

CVE-2025-66020: Valibot has a ReDoS vulnerability in `EMOJI_REGEX`

Vendor Open-Circle
Product valibot
Weakness CWE-1333
Published November 26, 2025
Last update November 26, 2025

CVSS base score

7.5/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality None
Integrity None

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

What the vulnerability does

01Description

Valibot helps validate data using a schema. In versions from 0.31.0 to 1.1.0, the EMOJI_REGEX used in the emoji action is vulnerable to a Regular Expression Denial of Service (ReDoS) attack. A short, maliciously crafted string (e.g., <100 characters) can cause the regex engine to consume excessive CPU time (minutes), leading to a Denial of Service (DoS) for the application. This issue has been patched in version 1.2.0.

Key dates

02Disclosure timeline

November 26, 2025 CVE published
November 26, 2025 Record updated