AIKIDO-2026-10904
nimiq-block is vulnerable to Integer Overflow
96
Critical Risk
This Affects:
nimiq-blockTL;DR
Affected versions are vulnerable to an authentication bypass issue in SkipBlockProof::verify caused by improper handling of out-of-range BitSet indices. An attacker can craft signer indices that inflate quorum calculations while mapping to the same validator slot after type casting, potentially allowing a malicious validator with insufficient real signatures to forge a valid skip block proof.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range.
Background info
nimiq-block is vulnerable to Integer Overflow in versions 0.0.1 - 1.2.2.
How to fix this
Upgrade the nimiq-block library to the patch version.
Links
GitHub Release
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SOC 2Compliant
ISO 27001Compliant