CVE-2025-66020
Valibot has a ReDoS vulnerability in `EMOJI_REGEX`
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.
INFO
Published Date :
Nov. 26, 2025, 2:15 a.m.
Last Modified :
Oct. 23, 2026, 10:10 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 3.1 | HIGH | MITRE-CVE |
Solution
- Update Valibot to version 1.2.0.
- Verify the application uses the updated library.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2025-66020.
| URL | Resource |
|---|---|
| https://github.com/open-circle/valibot/commit/cfb799db301a953a0950d5c05a34a3ab121262dc | |
| https://github.com/open-circle/valibot/security/advisories/GHSA-vqpr-j7v3-hqw9 |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2025-66020 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2025-66020
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2025-66020 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2025-66020 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Translated by [email protected]
Oct. 23, 2026
Action Type Old Value New Value Changed Translation Title: Valibot de open-circle, Description: Valibot ayuda a validar datos usando un esquema. En las versiones de 0.31.0 a 1.1.0, la EMOJI_REGEX utilizada en la acción de emoji es vulnerable a un ataque de Denegación de Servicio por Expresiones Regulares (ReDoS). Una cadena corta y maliciosamente elaborada (por ejemplo, <100 caracteres) puede hacer que el motor de expresiones regulares consuma un tiempo excesivo de CPU (minutos), lo que lleva a una Denegación de Servicio (DoS) para la aplicación. Este problema ha sido parcheado en la versión 1.2.0. Title: Valibot de open-circle, Description: Valibot ayuda a validar datos usando un esquema. En las versiones de 0.31.0 a 1.1.0, la EMOJI_REGEX utilizada en la acción de emoji es vulnerable a un ataque de Denegación de Servicio por Expresiones Regulares (ReDoS). Una cadena corta y maliciosamente elaborada (por ejemplo, anterior a 100 caracteres) puede hacer que el motor de expresiones regulares consuma un tiempo excesivo de CPU (minutos), lo que lleva a una Denegación de Servicio (DoS) para la aplicación. Este problema ha sido parcheado en la versión 1.2.0. -
CVE Translated by [email protected]
Oct. 18, 2026
Action Type Old Value New Value Added Translation Title: Valibot de open-circle, Description: Valibot ayuda a validar datos usando un esquema. En las versiones de 0.31.0 a 1.1.0, la EMOJI_REGEX utilizada en la acción de emoji es vulnerable a un ataque de Denegación de Servicio por Expresiones Regulares (ReDoS). Una cadena corta y maliciosamente elaborada (por ejemplo, <100 caracteres) puede hacer que el motor de expresiones regulares consuma un tiempo excesivo de CPU (minutos), lo que lleva a una Denegación de Servicio (DoS) para la aplicación. Este problema ha sido parcheado en la versión 1.2.0. -
CVE Modified by [email protected]
Jun. 17, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'open-circle', 'product': 'valibot', 'versions': [{'status': 'affected', 'version': '>= 0.31.0, < 1.2.0'}]}] -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 17, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2025-66020', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'yes'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2025-11-26T14:15:40.424558Z'} -
New CVE Received by [email protected]
Nov. 26, 2025
Action Type Old Value New Value Added 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. Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Added CWE CWE-1333 Added Reference https://github.com/open-circle/valibot/commit/cfb799db301a953a0950d5c05a34a3ab121262dc Added Reference https://github.com/open-circle/valibot/security/advisories/GHSA-vqpr-j7v3-hqw9