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    <lastBuildDate>Wed, 07 Oct 2026 13:49:22 +0000</lastBuildDate>
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      <title>CVE-2025-58359 — frost-core: refresh shares with smaller min_signers will reduce group security</title>
      <link>https://cve.radiocsirt.org/vuln/cve-2025-58359</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; ZcashFoundation frost&lt;/p&gt;
&lt;p&gt;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&amp;#39;s shares. This issue is fixed in version 2.2.0.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; ZcashFoundation frost&lt;/p&gt;
&lt;p&gt;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&amp;#39;s shares. This issue is fixed in version 2.2.0.&lt;/p&gt;</content:encoded>
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