{"schemaVersion":3,"id":"CVE-2024-21670","aliases":["GHSA-r78f-4q2q-hvv4"],"status":"published","duplicateOf":null,"title":null,"description":"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 A verifier may verify a credential from a holder as being \"not revoked\" when in fact, the holder's credential has been revoked. 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