Unrated severityOSV Advisory· Published Aug 4, 2026

Debian bouncycastle: In Bouncy Castle for Java before 1.85, KCCMBlockCipher MAC does not bind nonce w…

CVE-2026-12803

Description

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 Lts JavaOSV
Range: r2rv73dot11, r2rv73dot10, r2rv73dot9, …
Legion Of The Bouncy Castle Inc./Bouncy Castle for Javallm-fuzzy
Range: <1.85

Patches

Vulnerability mechanics

News mentions

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