cvedb.io
CVE-2026-33471
CRITICAL · CVSS 9.6
EPSS exploitation probability: 0%
Published 2026-04-22T20:16:40.317 · Last modified 2026-06-17T10:37:33.267

Summary

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`) 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.

Affected products

nimiq — nimiq_proof-of-stake

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References

This product uses data from the NVD API but is not endorsed or certified by the NVD. Informational only; not professional security advice.