Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
Versions of cggmp21 up to and including 0.6.3, and cggmp24 before 0.7.0-alpha.2, are vulnerable to signature forgery through altered presignatures. The source describes two cases: using presignatures with HD wallet derivation paths chosen after issuance, which reduces the security level, and using presignatures for raw signing of hashes without the original message, which allows signature forgery. Upgrade cggmp24 to 0.7.0-alpha.2 or later, following the migration guide; no fixed version is listed for cggmp21.
Not analysed yet
We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.
Severity and exploitation
| Score | Rating | CVSS | Vector | Source |
|---|---|---|---|---|
| 8.2 | High | 4.0 | CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N | CNA (GitHub_M) |
- CISA KEV Not listed.
- EPSS 0.0022, the 13th percentile, on 14 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 15:19 UTC First seen by agentprime
- 31 Oct 2026, 15:19 UTC Confirmed by OSV
Sources
- GitHub Advisory Database: GHSA-8frv-q972-9rq5
- OSV: GHSA-8frv-q972-9rq5
- github.com/LFDT-Lockness/cggmp21/security/advisories/GHSA-8frv-q972-9rq5
- nvd.nist.gov/vuln/detail/CVE-2025-66017
- github.com/LFDT-Lockness/cggmp21/commit/9d98157e151596573cb071da59d27a4e0ac9b8dc
- github.com/LFDT-Lockness/cggmp21
- rustsec.org/advisories/RUSTSEC-2025-0127.html
- rustsec.org/advisories/RUSTSEC-2025-0128.html
- www.dfns.co/article/cggmp21-vulnerabilities-patched-and-explained