{"id":"CVE-2025-58359","aliases":["GHSA-wgq8-vr6r-mqxm"],"url":"https://o3.security/vulnerability/CVE-2025-58359","summary":"frost-core: refresh shares with smaller min_signers will reduce group security","details":"### Impact\n\nIt was not clear that it is not possible to change `min_signers` (i.e. the threshold) with the refresh share functionality (`frost_core::keys::refresh` module). Using a smaller value would not decrease the threshold, and attempts to sign using a smaller threshold would fail. Additionally, after refreshing the shares with a smaller threshold, it would still be possible to sign with the original threshold; however, this could cause a security loss to the participant's shares. We have not determined the exact security implications of doing so and judged simpler to just validate `min_signers`. \n\n If for some reason you have done a refresh share procedure with a smaller `min_signers` we strongly recommend migrating to a new key. \n\n### Patches\n\nUpdating to 2.2.0 will ensure that the `min_signers` parameter will be validated. However it won't restore the security of groups refreshed with a smaller `min_signers` parameters.\n\n### Workarounds\n\nYou don't need to update if you don't use the refresh share functionality, or if you didn't try to change the `min_signers` parameter using the refresh share functionality.\n\n### References\n\nThank you [BlockSec](https://blocksec.com/) for reporting the finding","published":"2025-09-04T23:50:45.746Z","modified":"2026-08-12T03:51:43.907231580Z","cvss":null,"epss":{"score":0.00286,"percentile":0.21194,"asOf":"2026-09-16"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"crates.io","name":"frost-core","fixedVersion":"2.2.0"}],"fix":{"url":"https://github.com/ZcashFoundation/frost/commit/379ef689c733b3d9c80fd409071d4f3af4dafed2","label":"ZcashFoundation/frost@379ef68"},"references":[{"type":"WEB","url":"https://github.com/ZcashFoundation/frost/releases/tag/frost-core%2Fv2.2.0"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/58xxx/CVE-2025-58359.json"},{"type":"ADVISORY","url":"https://github.com/ZcashFoundation/frost/security/advisories/GHSA-wgq8-vr6r-mqxm"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-58359"},{"type":"FIX","url":"https://github.com/ZcashFoundation/frost/commit/379ef689c733b3d9c80fd409071d4f3af4dafed2"},{"type":"PACKAGE","url":"https://github.com/ZcashFoundation/frost"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:43.907231580Z"}}