AIKIDO-2026-448914
bcprov-jdk18on is vulnerable to Improper Validation of Integrity Check Value
87
High Risk
This Affects:
bcprov-jdk18onTL;DR
CCM-family modes (CCMBlockCipher, KCCMBlockCipher, KGCMBlockCipher) write decrypted plaintext into the caller buffer before the authentication tag is verified. Failed authentications can still expose plaintext bytes to the caller. Applications that use these AEAD modes on untrusted ciphertexts may leak plaintext on tag failure. The fix withholds plaintext from the caller until the tag check succeeds.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and you decrypt untrusted CCM-family AEAD ciphertext.
Background info
bcprov-jdk18on is vulnerable to Improper Validation of Integrity Check Value in versions 0.0.1 - 1.84.0.
How to fix this
Upgrade the org.bouncycastle provider library for your JDK target (bcprov-jdk18on, bcprov-jdk15to18 or bcprov-jdk14) to the patch version.
Links
Fix Commits
github.com/bcgit/bc-java/commit/08d675106bb663ddcc6ec0a4af6f6f62f512697bgithub.com/bcgit/bc-java/commit/cd4a5ab3ad619ff03c7767c1b8b19d5dea2970af
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SOC 2Compliant
ISO 27001Compliant