CVE-2022-31053: Biscuitsec Biscuit-Auth

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

Biscuit is an authentication and authorization token for microservices architectures. The Biscuit specification version 1 contains a vulnerable algorithm that allows malicious actors to forge valid Γ-signatures. Such an attack would allow an attacker to create a token with any access level. The version 2 of the specification mandates a different algorithm than gamma signatures and as such is not affected by this vulnerability. The Biscuit implementations in Rust, Haskell, Go, Java and Javascript all have published versions following the v2 specification. There are no known workarounds for this issue.

Affected products

• Biscuitsec Biscuit-Auth: from 1.0.0, up to and including 1.1.0
• Biscuitsec Biscuit-Go: before 2.0.0 (fixed in 2.0.0)
• Biscuitsec Biscuit-Haskell: version 0.1.1.0 only
• Clever-Cloud Biscuit-Java: before 2.0.0 (fixed in 2.0.0)

Published 2022-06-13. Last modified 2026-06-17.