AIKIDO-2026-292457
bcpg-jdk18on is vulnerable to Integrity Check Bypass
82
High Risk
This Affects:
bcpg-jdk18onTL;DR
OpenPGP decryption treats truncation as a clean end of input and releases partial plaintext without reporting a failed or missing integrity check. The fix stops an AEAD end-of-file from being treated as success and closes the high-level integrity stream so SEIPDv1 MDC verification cannot be skipped.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and you decrypt attacker-truncated OpenPGP AEAD messages or use the high-level API for integrity-protected SEIPDv1 messages.
Background info
bcpg-jdk18on is vulnerable to Integrity Check Bypass in versions 1.74 - 1.85.
How to fix this
Upgrade the bcpg-jdk18on library to the patch version.
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