CVE-2025-58359 – frost-core: refresh shares with smaller min_signers will reduce group security

CVE ID : CVE-2025-58359

Published : Sept. 5, 2025, 12:15 a.m. | 58 minutes ago

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.

Severity: 6.0 | MEDIUM

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