{"id":"CVE-2025-65849","revision":"43a9f0bdb8284b228ddfbb934654158b","records":[{"revision":"43a9f0bdb8284b228ddfbb934654158b","observedAt":"2026-10-25T03:17:36.152+00:00","statement":{"source":"nvd","id":"CVE-2025-65849","aliases":[],"title":"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…","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.”","state":0,"publishedAt":"2025-12-08T19:15:50.817+00:00","modifiedAt":"2026-10-18T15:10:00.097+00:00","affected":[],"metrics":[{"system":"CVSS 3.1 · 134c704f-9b21-4f2e-91b3-4a467353bcc0 · Secondary","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","score":9.1,"severity":"CRITICAL"}],"references":["https://altcha.org/docs/v2/obfuscation/","https://github.com/altcha-org/altcha/blob/154f874cbcdd4e639783463130d13988a2bd1bdc/src/helpers.ts#L170-L194","https://github.com/eternal-flame-AD/altcha-deobfs"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2025-65849","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Deferred","weaknesses":["CWE-327"],"productCriteria":[],"sourceDates":{"published":"2025-12-08T19:15:50.817","lastModified":"2026-10-18T15:10:00.097"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2025-65849","identifiers":["CVE-2025-65849"]},"retained":false,"historicalAffected":[]}],"coverage":[]}