AIKIDO-2026-766129
bcpg-jdk18on is vulnerable to Signature Verification Bypass
80
High Risk
This Affects:
bcpg-jdk18onTL;DR
An OpenPGP subkey without its own Key Flags inherits primary-key signing capability, so a signature is accepted without the required cross-certification and can be attributed to the wrong key. The fix stops a subkey with no Key Flags from inheriting primary-key capabilities.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and you rely on the high-level OpenPGP API to attribute data signatures to certificates that contain signing subkeys.
Background info
bcpg-jdk18on is vulnerable to Signature Verification Bypass in versions 1.81 - 1.85.
How to fix this
Upgrade the bcpg-jdk18on library to the patch version.
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