What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 6.0 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-09-05 · updated 2026-06-17
• Weakness: CWE-325

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.

Affected products

• ZcashFoundation frost: from 2.0.0, < 2.2.0

References

• https://github.com/ZcashFoundation/frost/commit/379ef689c733b3d9c80fd409071d4f3af4dafed2
• https://github.com/ZcashFoundation/frost/releases/tag/frost-core%2Fv2.2.0
• https://github.com/ZcashFoundation/frost/security/advisories/GHSA-wgq8-vr6r-mqxm

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