high7.5
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).
Impact
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
| Vendor | Product | Affected versions |
|---|---|---|
| Bouncycastle | Bc-Java | before 1.85 |
| Bouncycastle | Bouncy Castle For Java Lts | through 2.73.11 |