Vulnerability in Open-Circle Valibot
CVE-2025-66020
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.
Vulnerability class: ReDoS (Regular Expression Denial of Service)
EPSS: 0.003 (26.4th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Open-circle Valibot — versions >= 0.31.0, < 1.2.0
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM)
- security-advisories@github.com (x_refsource_MISC)
Frequently asked questions
- What is CVE-2025-66020?
- CVE-2025-66020 is a high-severity vulnerability in Open-Circle Valibot, classified under Inefficient Regular Expression Complexity. CVSS score: 7.5/10. Published 2025-11-26.
- How severe is CVE-2025-66020?
- High severity. CVSS v3 base score is 7.5 out of 10.