CVE-2025-65951 Inside Track / Entropy Derby Timelock Encryption Bypassed via Pre-Computed VDF Output Leakage
Attackers bypass timelock encryption in a betting engine by pre-computing VDF outputs, allowing immediate decryption of bets.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-65951?
CVE-2025-65951 is a high-severity vulnerability in mescuwa entropy-derby, published on 25 Nov 2025. An attacker needs administrator access to exploit it, with no action from the victim.
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.
Which versions are affected by CVE-2025-65951?
How do I fix CVE-2025-65951?
No fix has been published for CVE-2025-65951 yet. Limit exposure of the affected software until one is available.
Is CVE-2025-65951 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-65951 exists.
Sources
Also known as GHSA-pm54-f847-w4mh.