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TI-2025-40519 Aliases CVE-2025-65951

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

Priority HIGH 73CWE-200Published · Updated

Key facts

Attack vector
Network
Privileges required
High
User interaction
None
Attack complexity
Low
Impact type
Information disclosure
Confidentiality · integrity · availability
High · High · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-200.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00127 2nd percentileScored 2026-11-07
Fix Fixed entropy-derby (mescuwa): 2d38d2f16bbb3b4240698148f80d8c5202725c77

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
mescuwaentropy-derbybefore 2d38d2f16bbb3b4240698148f80d8c5202725c772d38d2f16bbb3b4240698148f80d8c5202725c77Patch availableCNA
  • entropy-derby Vendormescuwa Affected before 2d38d2f16bbb3b4240698148f80d8c5202725c77 Fixed in 2d38d2f16bbb3b4240698148f80d8c5202725c77 Patch available CNA

Remediation

  • Fix · CNA entropy-derby (mescuwa) Fixed in 2d38d2f16bbb3b4240698148f80d8c5202725c77

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-65951

References

Other 2

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences