Vulnerability · Published Nov 25, 2025 · Assigned by GitHub_M

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

High 8.7

In plain English

A high-severity information exposure in entropy-derby from mescuwa. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 2% of all known vulnerabilities).

Severity (CVSS 3.1)8.7High

Exploit odds (30 days)0.1%top 97.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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 (as reported)

Vendor	Product	Versions
mescuwa	entropy-derby	< 2d38d2f16bbb3b4240698148f80d8c5202725c77

Weakness: CWE-200, CWE-327 · Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N

References

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