Vulnerability · Published Sep 4, 2025 · Assigned by GitHub_M
CVE-2025-58359frost-core: refresh shares with smaller min_signers will reduce group security
Medium 6.0
In plain English
A medium-severity security flaw in frost from ZcashFoundation. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 23% of all known vulnerabilities).
Official 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 (as reported)
| Vendor | Product | Versions |
|---|---|---|
| ZcashFoundation | frost | >= 2.0.0, < 2.2.0 |
Weakness: CWE-325 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N