CVE-2021-43571: Starkbank Ecdsa-Node

Critical severity, CVSS 9.8. EPSS: 1% chance of exploitation in the next 30 days.

The verify function in the Stark Bank Node.js ECDSA library (ecdsa-node) 1.1.2 fails to check that the signature is non-zero, which allows attackers to forge signatures on arbitrary messages.

Affected products

• Starkbank Ecdsa-Node: version 1.1.2 only

Published 2021-11-09. Last modified 2026-06-17.