Vulnerability in Legion Of The Bouncy Castle Inc. Bc-java

CVE-2026-12803

In Bouncy Castle for Java before 1.85, KCCMBlockCipher MAC does not bind nonce when AAD is absent (cross-nonce AEAD forgery). This issue also affects Bouncy Castle for Java LTS before 2.73.12.

Affected products

Legion Of The Bouncy Castle Inc. Bc-java — versions 0
Legion Of The Bouncy Castle Inc. Bc-lts-java — versions 2.73.0

Weakness classification (CWE)

CWE-354 — Improper Validation of Integrity Check Value

References

91579145-5d7b-4cc5-b925-a0262ff19630 (vendor-advisory)
91579145-5d7b-4cc5-b925-a0262ff19630 (patch)
91579145-5d7b-4cc5-b925-a0262ff19630 (patch)
91579145-5d7b-4cc5-b925-a0262ff19630 (vendor-advisory)