CVE-2025-65951

Inside Track / Entropy Derby Timelock Encryption Bypassed via Pre-Computed VDF Output Leakage

Published Nov 25, 2025 CVSS 3.1 · 8.7 High EPSS < 1% KEV · Not listed
Description
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared Mescuwa
Mescuwa entropy-derby
Vendors & Products Mescuwa
Mescuwa entropy-derby
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description 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.
Title Inside Track / Entropy Derby Timelock Encryption Bypassed via Pre-Computed VDF Output Leakage
Weaknesses CWE-200
CWE-327
References
Metrics cvssV3_1

{'score': 8.7, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
GitHub_M
Published
Updated
Nov 25, 2025, 2:34 PM
Reserved
Nov 18, 2025, 4:14 PM
Status
Deferred
Published
Nov 25, 2025, 1:15 AM
Modified
Oct 18, 2026, 8:10 PM