CVE-2024-21670: Hyperledger Ursa

High severity, CVSS 8.1. EPSS: 0.3% chance of exploitation in the next 30 days.

Ursa is a cryptographic library for use with blockchains. The revocation schema that is part of the Ursa CL-Signatures implementations has a flaw that could impact the privacy guarantees defined by the AnonCreds verifiable credential model, allowing a malicious holder of a revoked credential to generate a valid Non-Revocation Proof for that credential as part of an AnonCreds presentation. A verifier may verify a credential from a holder as being "not revoked" when in fact, the holder's credential has been revoked. Ursa has moved to end-of-life status and no fix is expected.

Affected products

Published 2024-01-16. Last modified 2026-06-17.