What’s Vulnerable › Vulnerabilities

CVE-2024-21670: CL-Signatures Revocation Scheme in Ursa has flaws that allow a holder to demonstrate non-revocation of a revoked credential

• Severity: high (CVSS 8.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-01-16 · updated 2026-06-17
• Weakness: CWE-327

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 A verifier may verify a credential from a holder as being "not revoked" when in fact, the holder's credential has been revoked. Ursa has moved to end-of-life status and no fix is expected.

Affected products

• hyperledger-archives ursa: 0.1.0

References

• https://github.com/hyperledger-archives/ursa/security/advisories/GHSA-r78f-4q2q-hvv4
• https://github.com/hyperledger-archives/ursa/security/advisories/GHSA-r78f-4q2q-hvv4

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