nimiq-block contains block primitives to be used in Nimiq'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`) f…
Exact source revision recorded 30 Oct 2026 04:58:01 UTC. It does not establish the source's current position. Latest evidence.
euvd · EUVD-2026-25054
Publishednimiq-block contains block primitives to be used in Nimiq'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.
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datePublished: Apr 22, 2026, 7:13:04 PM
dateUpdated: Apr 23, 2026, 2:15:20 PM
- Source published
- Apr 22, 2026, 7:13:04 PM (timezone not stated)
- Source modified
- Apr 23, 2026, 2:15:20 PM (timezone not stated)
- Observed here
- 30 Oct 2026 04:58:01 UTC
- Source terms
- ENISA EUVD · source terms and attribution apply
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EUVD CVSS 3.1 · 9.6 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:H