Altcha

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    Products: 1
    Vulnerabilities: 2
    Known Exploited: 0
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    1
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    Vulnerabilities

    CVE-2025-68113

    ALTCHA Proof-of-Work Vulnerable to Challenge Splicing and Replay

    Last Modified: Apr 15, 2026
    Published: Dec 16, 2025

    CVE-2025-65849

    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.”

    Last Modified: Apr 15, 2026
    Published: Dec 08, 2025
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