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altcha 2.1.0-beta.1 | Vulnerabilities | Sonatype Guide
npm
altcha
2.1.0-beta.1
altcha 2.1.0-beta.1
Published
Jun 9, 2025
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6.3
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.”
affected
Severity
Medium
Published
Dec 9, 2025
