AIKIDO-2026-805345
bcprov-jdk18on is vulnerable to Timing Attacks
82
High Risk
This Affects:
bcprov-jdk18onTL;DR
Poly.toMsg, Poly.compressPoly, and PolyVec.compressPolyVec in the ML-KEM (CRYSTALS-Kyber) implementation divide secret-derived polynomial coefficients by the modulus q in non-constant time. An attacker who can measure the timing of many decapsulations that reuse the same long-term private key can recover that key (KyberSlash1 and KyberSlash2). Encapsulation compression that only touches public ciphertext values is not affected. The fix replaces those divisions with constant-time equivalents.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and your application performs ML-KEM/Kyber decapsulation with a long-lived private key where an attacker can observe timing.
Background info
bcprov-jdk18on is vulnerable to Timing Attacks in versions 1.73 - 1.77.
How to fix this
Upgrade the org.bouncycastle:bcprov-jdk18on library to the patch version.
Links
Fix Commits
github.com/bcgit/bc-java/commit/1590247178f2280defa36421475f015175dfbe9egithub.com/bcgit/bc-java/commit/5adb2c5c5b462a332b01a012bea0784b40b904e5
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