{"id":"HSEC-2023-0002","summary":"Improper Verification of Cryptographic Signature","details":"# Improper Verification of Cryptographic Signature\n\nThe Biscuit specification version 1 contains a vulnerable algorithm that allows\nmalicious actors to forge valid Γ-signatures. Such an attack would allow an\nattacker to create a token with any access level. The version 2 of the\nspecification mandates a different algorithm than gamma signatures and as such\nis not affected by this vulnerability.\n","aliases":["CVE-2022-31053","GHSA-75rw-34q6-72cr","GO-2022-0564"],"modified":"2026-01-30T02:26:51.725722Z","published":"2025-11-14T14:45:34Z","related":["GHSA-75rw-34q6-72cr"],"database_specific":{"osvs":"https://raw.githubusercontent.com/haskell/security-advisories/refs/heads/generated/osv-export","home":"https://github.com/haskell/security-advisories","repository":"https://github.com/haskell/security-advisories"},"references":[{"type":"REPORT","url":"https://eprint.iacr.org/2020/1484"},{"type":"ADVISORY","url":"https://github.com/biscuit-auth/biscuit/security/advisories/GHSA-75rw-34q6-72cr"}],"affected":[{"package":{"name":"biscuit-haskell","ecosystem":"Hackage","purl":"pkg:hackage/biscuit-haskell"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0.1.0.0"},{"fixed":"0.2.0.0"}]}],"versions":["0.1.0.0","0.1.1.0"],"database_specific":{"osv":"https://raw.githubusercontent.com/haskell/security-advisories/refs/heads/generated/osv-export/2023/HSEC-2023-0002.json","human_link":"https://github.com/haskell/security-advisories/tree/main/advisories/published/2023/HSEC-2023-0002.md","source":"https://github.com/haskell/security-advisories/blob/generated/osv-export/2023/HSEC-2023-0002.json"},"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"}]}],"schema_version":"1.7.5"}