AIKIDO-2026-231096
bcpkix-jdk18on is vulnerable to Improper Validation of Integrity Check Value
87
CVE Score
High
Improper Validation of Integrity Check Value
TL;DR
The CMS API in the org.bouncycastle.cms package does not enforce the authentication tag length when decrypting AuthEnvelopedData content. Authenticated-encrypted content can be processed with a truncated or manipulated AEAD tag, so the integrity check that should reject tampered data can pass. Before the fix, this allows undetected modification or forgery of authenticated CMS content. The fix validates the expected tag length and rejects mismatches.
How do I fix this?
Upgrade the org.bouncycastle:bcpkix-jdk18on library to the patch version.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and you decrypt CMS AuthEnvelopedData messages from untrusted or externally influenced sources.
Package
Versions
0.0.1 - 1.84
Fixed in 1.85Background info
bcpkix-jdk18on is vulnerable to Improper Validation of Integrity Check Value in versions 0.0.1 - 1.84.
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