cvedb.io
CVE-2025-65849
CRITICAL · CVSS 9.1
EPSS exploitation probability: 0%
Published 2025-12-08T19:15:50.817 · Last modified 2026-06-17T09:56:01.200

Summary

A cryptanalytic break in Altcha Proof-of-Work obfuscation mode version 0.8.0 and later allows for remote visitors to recover the Proof-of-Work nonce in constant time via mathematical deduction. NOTE: this is disputed by the Supplier because the product's objective is "to discourage automated scraping / bots, not guarantee resistance to determined attackers." The documentation states “the goal is not to provide a secure cryptographic algorithm but to use a proof-of-work mechanism that allows any capable device to decrypt the hidden data.”

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References

This product uses data from the NVD API but is not endorsed or certified by the NVD. Informational only; not professional security advice.