CVE-2025-66020
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-11-26

Last updated on: 2025-11-26

Assigner: GitHub, Inc.

Description
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.
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Meta Information
Published
2025-11-26
Last Modified
2025-11-26
Generated
2026-06-16
AI Q&A
2025-11-26
EPSS Evaluated
2026-06-15
NVD
CVE-2025-66020
EUVD
EUVD-2025-199685
Affected Vendors & Products
Showing 3 associated CPEs
Vendor Product Version / Range
valibot valibot 1.1.0
valibot valibot 1.2.0
valibot valibot 0.31.0
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-1333 The product uses a regular expression with an inefficient, possibly exponential worst-case computational complexity that consumes excessive CPU cycles.
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Executive Summary

This vulnerability is a Regular Expression Denial of Service (ReDoS) in the EMOJI_REGEX used by Valibot's emoji action in versions 0.31.0 to 1.1.0. A specially crafted short string (less than 100 characters) can cause the regex engine to consume excessive CPU time for minutes, leading to the application becoming unresponsive or unavailable.

Impact Analysis

The vulnerability can cause a Denial of Service (DoS) by making the application consume excessive CPU resources, potentially making it unavailable or unresponsive to legitimate users.

Mitigation Strategies

Upgrade Valibot to version 1.2.0 or later, where the vulnerability has been patched. Avoid using vulnerable versions (0.31.0 to 1.1.0) to prevent exposure to the ReDoS attack.

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