AIKIDO-2026-112898
bcmls-jdk18on is vulnerable to Improper Certificate Validation
85
High Risk
This Affects:
bcmls-jdk18onTL;DR
MLS verifies a LeafNode with its declared signature key without checking that the key matches the public key in its X.509 credential, so a member identity can be paired with an unrelated signing key. The fix parses the end-entity certificate key and compares it with the MLS signature_key.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and your MLS deployment accepts X.509 credentials and relies on Bouncy Castle to bind a member identity to its LeafNode signing key.
Background info
bcmls-jdk18on is vulnerable to Improper Certificate Validation in versions 1.78 - 1.85.
How to fix this
Upgrade the bcmls-jdk18on library to the patch version.
Are You Affected?
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