CVE-2026-33471

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.

• CWE-20
• CWE-190
• CWE-345
• CWE-1284

• https://github.com/nimiq/core-rs-albatross/commit/d02059053181ed8ddad6b59a0adfd661ef5cd823Patch
• https://github.com/nimiq/core-rs-albatross/releases/tag/v1.3.0Release Notes
• https://github.com/nimiq/core-rs-albatross/security/advisories/GHSA-6973-8887-87ffPatch, Vendor Advisory

Published

Apr 22, 2026

Last Modified

Jun 17, 2026

Status

Analyzed

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