CVE-2025-65951 HIGH

CVE-2025-65951: Inside Track / Entropy Derby Timelock Encryption Bypassed via Pre-Computed VDF Output Leakage

Vendor Mescuwa
Product entropy-derby
Weakness CWE-200 · Info exposure
Published November 25, 2025
Last update November 25, 2025
View on NVD All CVEs

CVSS base score

8.7/10
Attack vector Network
Attack complexity Low
Privileges required High
User interaction None
Confidentiality High
Integrity High

CVSS vector

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

What the vulnerability does

01Description

Inside Track / Entropy Derby is a research-grade horse-racing betting engine. Prior to commit 2d38d2f, the VDF-based timelock encryption system fails to enforce sequential delay against the betting operator. Bettors pre-compute the entire Wesolowski VDF and include vdfOutputHex in their encrypted bet ticket, allowing the house to decrypt immediately using fast proof verification instead of expensive VDF evaluation. This issue has been patched via commit 2d38d2f.

Key dates

02Disclosure timeline

November 25, 2025 CVE published
November 25, 2025 Record updated