AIKIDO-2026-511225
bcprov-jdk18on is vulnerable to Observable Timing Discrepancy
80
High Risk
This Affects:
bcprov-jdk18onTL;DR
HQC indexes finite-field tables with secret values and runs a secret-dependent sampler, so cache behavior and repeated decapsulation timings leak private-key material. The fix removes the secret-indexed tables and masks the fixed-weight sampler scans and writes.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and you use HQC and an attacker can observe cache behavior or repeatedly time decapsulation.
Background info
bcprov-jdk18on is vulnerable to Observable Timing Discrepancy in versions 1.72 - 1.85.
How to fix this
Upgrade the bcprov-jdk18on library to the patch version.
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