frost-core: refresh shares with smaller min_signers will reduce group security
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
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| ZcashFoundation | frost | affected |
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| Vendor | Product | Versions |
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| Zcash | Frost | — |
| Source | ID | Title |
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EUVD |
EUVD-2025-26877 | ZF FROST is a Rust implementation of FROST (Flexible Round-Optimised Schnorr Threshold signatures). In versions 2.0.0 through 2.1.0, refresh shares with smaller min_signers will reduce security of group. The inability to change min_signers (i.e. the threshold) with the refresh share functionality (frost_core::keys::refresh module) was not made clear to users. 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, potentially causing a security loss to the participant's shares. This issue is fixed in version 2.2.0. |
Github GHSA |
GHSA-wgq8-vr6r-mqxm | frost-core: refresh shares with smaller min_signers will reduce security of group |
No CVSS v3.1
No CVSS v3.0
No CVSS v2
This CVE is not in the KEV list.
Exploit prediction score: < 1% (0.305% probability within 30 days)
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ssvc
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| First Time appeared |
Zcash
Zcash frost |
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| Vendors & Products |
Zcash
Zcash frost |
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| Description | ZF FROST is a Rust implementation of FROST (Flexible Round-Optimised Schnorr Threshold signatures). In versions 2.0.0 through 2.1.0, refresh shares with smaller min_signers will reduce security of group. The inability to change min_signers (i.e. the threshold) with the refresh share functionality (frost_core::keys::refresh module) was not made clear to users. 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, potentially causing a security loss to the participant's shares. This issue is fixed in version 2.2.0. | |
| Title | frost-core: refresh shares with smaller min_signers will reduce group security | |
| Weaknesses | CWE-325 | |
| References |
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| Metrics |
cvssV4_0
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