VULNERABILITY INTELLIGENCE
CVE-2025-65849
CVSS score9.1 CRITICAL
EPSS probability0.22%
CISA KEVNot currently listed
Published2025-12-08
Last modified2026-10-18
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Description
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.”
Weakness classification
- 134c704f-9b21-4f2e-91b3-4a467353bcc0: CWE-327