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

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 minsigners will reduce security of group. The inability to change minsigners i.e. the threshold with the refresh share functionality...

CVE-2025-58359

Summary: The frost-core (ZF FROST) vulnerability CVE-2025-58359 affects frost-core versions 2.0.0–2.1.0. The issue arises because the refresh shares mechanism in frost_core::keys::refresh did not clearly communicate that changing min_signers would not reduce the threshold, and after refreshing wi...

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

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 minsigners will reduce security of group. The inability to change minsigners i.e. the threshold with the refresh share functionality...

GHSA-WGQ8-VR6R-MQXM frost-core: refresh shares with smaller min_signers will reduce security of group

Impact It was not clear that it is not possible to change minsigners i.e. the threshold with the refresh share functionality frostcore::keys::refresh module. Using a smaller value would not decrease the threshold, and attempts to sign using a smaller threshold would fail. Additionally, after...