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CVE-2026-33471 - Vulnerability Analysis

CriticalCVSS: 9.6

Last Updated: April 22, 2026

nimiq-block - Authentication Bypass

Published: April 22, 2026Updated: April 22, 2026Remote Exploitable

Overview

nimiq-block < 1.3.0 contains a signature verification bypass caused by out-of-range MultiSignature.signers indices colliding on u16 slots in SkipBlockProof::verify, letting malicious validators bypass quorum checks, exploit requires crafted SkipBlockProof.

Severity & Score

Severity: Critical

CVSS Score: 9.6

Impact

Malicious validators can bypass quorum verification, allowing unauthorized block approval with fewer valid signatures.

Mitigation

Update to version 1.3.0 or later.

References

https://github.com/nimiq/core-rs-albatross/commit/d02059053181ed8ddad6b59a0adfd661ef5cd823
https://github.com/nimiq/core-rs-albatross/releases/tag/v1.3.0
https://github.com/nimiq/core-rs-albatross/security/advisories/GHSA-6973-8887-87ff

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Details

CVE ID: CVE-2026-33471
Severity: Critical
CVSS Score: 9.6
Type: broken_authentication
Status: unconfirmed

CWE

CWE-20

CVSS Metrics

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:H