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      <title>CVE-2026-33471 — nimiq-block has skip block quorum bypass via out-of-range BitSet indices &amp; u16 truncation</title>
      <link>https://cve.radiocsirt.org/vuln/cve-2026-33471</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; nimiq-block&lt;/p&gt;
&lt;p&gt;nimiq-block contains block primitives to be used in Nimiq&amp;#39;s Rust implementation. `SkipBlockProof::verify` computes its quorum check using `BitSet.len()`, then iterates `BitSet` indices and casts each `usize` index to `u16` (`slot as u16`) for slot lookup. Prior to version 1.3.0, if an attacker can get a `SkipBlockProof` verified where `MultiSignature.signers` contains out-of-range indices spaced by 65536, these indices inflate `len()` but collide onto the same in-range `u16` slot during aggregation. This makes it possible for a malicious validator with far fewer than `2f+1` real signer slots to pass skip block proof verification by multiplying a single BLS signature by the same factor. The patch for this vulnerability is included as part of v1.3.0. No known workarounds are available.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; nimiq-block&lt;/p&gt;
&lt;p&gt;nimiq-block contains block primitives to be used in Nimiq&amp;#39;s Rust implementation. `SkipBlockProof::verify` computes its quorum check using `BitSet.len()`, then iterates `BitSet` indices and casts each `usize` index to `u16` (`slot as u16`) for slot lookup. Prior to version 1.3.0, if an attacker can get a `SkipBlockProof` verified where `MultiSignature.signers` contains out-of-range indices spaced by 65536, these indices inflate `len()` but collide onto the same in-range `u16` slot during aggregation. This makes it possible for a malicious validator with far fewer than `2f+1` real signer slots to pass skip block proof verification by multiplying a single BLS signature by the same factor. The patch for this vulnerability is included as part of v1.3.0. No known workarounds are available.&lt;/p&gt;</content:encoded>
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