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CVE-2025-65849

🚨 CRITICAL

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:...

Published
Dec 08, 2025
Last Modified
Dec 11, 2025
Views
9
Bookmarks
0

Description

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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 β€œthe 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.”

CVSS Scores

CVSS 3.1 9.1
9.1
CRITICAL
CVSS 2.0 9.1

References

altcha.org github.com github.com

Additional Information

Source
cve@mitre.org
State
Awaiting analysis

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