CVE-2025-65849
Altcha Proof-of-Work obfuscation mode cryptanalytic break
EPSS 0.02%
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.
How to fix CVE-2025-65849
No fixed version has been published yet. Mitigate by removing the affected package or applying upstream guidance from the references below.
- npm/altcha—no fix listed
Is CVE-2025-65849 being exploited?
Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.
Affected packages (1)
- >= 0.8.0, <= 2.2.4
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 4.0 | — | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:P |