AIKIDO-2026-434834
bcpkix-jdk18on is vulnerable to Improper Input Validation
60
Medium Risk
This Affects:
bcpkix-jdk18onTL;DR
CMS recipient key-size validation compares the encrypted-key bytes to the RFC 9709 HKDF OID, so the check never runs for HKDF-derived content-encryption keys. The fix compares the wrapper algorithm OID and validates the inner content-encryption algorithm.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and your CMS key-transport recipient enables key-size validation and processes RFC 9709 HKDF-derived content-encryption keys.
Background info
bcpkix-jdk18on is vulnerable to Improper Input Validation in versions 1.78 - 1.85.
How to fix this
Upgrade the bcpkix-jdk18on library to the patch version.
Are You Affected?
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