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2 vulnerabilities found for nimiq-block by nimiq

CVE-2026-33471 (GCVE-0-2026-33471)

Vulnerability from nvd – Published: 2026-04-22 19:13 – Updated: 2026-04-23 14:15
VLAI?
Title
nimiq-block has skip block quorum bypass via out-of-range BitSet indices & u16 truncation
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.
Severity ?
9.6 (Critical)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:H
CWE
  • CWE-20 - Improper Input Validation
  • CWE-190 - Integer Overflow or Wraparound
  • CWE-345 - Insufficient Verification of Data Authenticity
  • CWE-1284 - Improper Validation of Specified Quantity in Input
Assigner
References
Impacted products
Vendor Product Version
nimiq nimiq-block Affected: < 1.3.0
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2026-33471 (GCVE-0-2026-33471)

Vulnerability from cvelistv5 – Published: 2026-04-22 19:13 – Updated: 2026-04-23 14:15
VLAI?
Title
nimiq-block has skip block quorum bypass via out-of-range BitSet indices & u16 truncation
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.
Severity ?
9.6 (Critical)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:H
CWE
  • CWE-20 - Improper Input Validation
  • CWE-190 - Integer Overflow or Wraparound
  • CWE-345 - Insufficient Verification of Data Authenticity
  • CWE-1284 - Improper Validation of Specified Quantity in Input
Assigner
References
Impacted products
Vendor Product Version
nimiq nimiq-block Affected: < 1.3.0
Create a notification for this product.
Show details on NVD website
To clipboard 

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