CVE-2022-31053
Signature forgery in Biscuit
- Published
- Updated
- Reserved
- Assigned by
- GitHub_M
Description
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.
Public exploit
An exploit or proof of concept is public: anyone can try it against an unpatched system. CISA's SSVC rates its exploitation: a proof of concept is public.
Timeline
ID reserved
By GitHub_M
- 26 days later
· 26 days later
Published
- 3 years later
· 3 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| GitHub_MCNA (assigner) | 3.1 | Critical9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Modified | 3.1 | Critical9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 1.0% · top 36% of all CVEs (7 Nov 2026)
- CISA SSVC
- Exploitation: poc · Automatable: yes · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.8.
Weakness
Affected products
- affected biscuit-auth >= 1.0.0, < 2.0.0
- affected biscuit-haskell = 0.1.1.0
- affected com.clever-cloud.biscuit-java < 2.0.0
- affected github.com/biscuit-auth/biscuit-go < 2.0
Affected packages
From reviewed advisories of the GitHub Advisory Database.
- Gogithub.com/biscuit-auth/biscuit-goGHSA-75rw-34q6-72cr (opens in a new tab)
- Mavencom.clever-cloud:biscuit-javaGHSA-75rw-34q6-72cr (opens in a new tab)
- crates.iobiscuit-authGHSA-75rw-34q6-72cr (opens in a new tab)
References (2)
- https://github.com/biscuit-auth/biscuit/security/advisories/GHSA-75rw-34q6-72cr (opens in a new tab)x_refsource_CONFIRMx_transferred
- https://eprint.iacr.org/2020/1484 (opens in a new tab)x_refsource_MISCx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-75rw-34q6-72cr (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2022-31053)Record last updated .