CVE-2026-33471nimiq-block contains block primitives to be used in Nimiq's Rust implementation.
Updated under an hour ago ()
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It affects nimiq_proof-of-stake. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 9.6 CRITICAL (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:H
- Weakness (CWE)
- CWE-20, CWE-190, CWE-345, CWE-1284
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Not given
- NVD analysis
- Analyzed
- Record last updated
- Jun 17, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
nimiq nimiq_proof-of-stake nimiq:nimiq_proof-of-stake | before 1.3.0 | NVD |
References
- 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
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.