Instituto Nacional de ciberseguridad. Sección Incibe
Instituto Nacional de Ciberseguridad. Sección INCIBE-CERT

CVE-2025-65849

Gravedad CVSS v3.1:
CRÍTICA
Tipo:
CWE-327 Uso de algoritmo criptográfico vulnerable o inseguro
Fecha de publicación:
08/12/2025
Última modificación:
11/12/2025

Descripción

*** Pendiente de traducción *** 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.”