What’s Vulnerable › Vulnerabilities

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

• Severity: high (CVSS 8.7 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-11-25 · updated 2026-10-18
• Weakness: CWE-200

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.

Affected products

• mescuwa entropy-derby: before 2d38d2f16bbb3b4240698148f80d8c5202725c77

References

• https://github.com/mescuwa/entropy-derby/commit/2d38d2f16bbb3b4240698148f80d8c5202725c77
• https://github.com/mescuwa/entropy-derby/security/advisories/GHSA-pm54-f847-w4mh

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