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

November 26, 2025

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.

References

github.com/advisories/GHSA-vqpr-j7v3-hqw9
github.com/open-circle/valibot
github.com/open-circle/valibot/commit/cfb799db301a953a0950d5c05a34a3ab121262dc
github.com/open-circle/valibot/security/advisories/GHSA-vqpr-j7v3-hqw9
nvd.nist.gov/vuln/detail/CVE-2025-66020

Code Behaviors & Features

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