AIKIDO-2026-550297
bcpg-jdk18on is vulnerable to Improper Validation of Integrity Check Value
87
High Risk
This Affects:
bcpg-jdk18onTL;DR
Bouncy Castle's OpenPGP AEAD decryption omits verification of the final authentication tag when the ciphertext ends on a chunk boundary. A tampered message can have its trailing plaintext chunk silently stripped or altered and still be accepted as authentic. This breaks the AEAD integrity guarantee and can also expose message contents. The fix verifies the final tag unconditionally before signalling end of stream in both the Bc and Jce decryptors.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and your application performs OpenPGP AEAD (SEIPDv2/v5) decryption on externally supplied messages.
Background info
bcpg-jdk18on is vulnerable to Improper Validation of Integrity Check Value in versions 1.74.0 - 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