AIKIDO-2026-431029
bcpg-jdk18on is vulnerable to Improper Verification of Cryptographic Signature
87
High Risk
This Affects:
bcpg-jdk18onTL;DR
Bouncy Castle's OpenPGP one-pass inline-signature processing silently ignores signature policy failures instead of surfacing them to the caller. A message whose inline signature does not satisfy the configured policy is still processed as if verification succeeded. This lets unsigned or improperly signed content be accepted as authentic. The fix propagates inline-signature policy failures so callers can reject the data.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and your application relies on OpenPGP inline (one-pass) signature policy enforcement for externally supplied messages.
Background info
bcpg-jdk18on is vulnerable to Improper Verification of Cryptographic Signature in versions 1.81.0 - 1.84.0.
How to fix this
Upgrade the org.bouncycastle:bcpg-jdk18on library to the patch version.
Links
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SOC 2Compliant
ISO 27001Compliant