CVE-2025-65951

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

State: Published
Severity: 8.7 High
Published: Nov 25, 2025
Updated: Nov 25, 2025
Reserved: Nov 18, 2025

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.

Scores

CVSS	Score	Vector	Source
3.1	8.7 High	CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N	GitHub_M

Weaknesses

CWE-200 Exposure of Sensitive Information to an Unauthorized Actor
CWE-327 Use of a Broken or Risky Cryptographic Algorithm

Affected Products

Product	Versions
entropy-derbymescuwa	< 2d38d2f16bbb3b4240698148f80d8c5202725c77Affected

References

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