CVE-2025-65951

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

CVSS 8.7 HIGHEPSS 0.1%CWE-200 CWE-327

Vexday Risk Score

21Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 8.7EPSS 0.1%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

25 Nov 2025Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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.

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

Affected products

mescuwa · entropy-derby

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References

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