CVE-2026-12803

High

Open

TLP:CLEAR

KCCMBlockCipher MAC does not bind nonce when AAD is absent (cross-nonce AEAD forgery)

NVD CVE.org

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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.

Details

CVSS Score: 8.7
EPSS Score ⓘ: 0.17%

7.1th percentile
CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/U:Amber
Confidence: 90%
Published: Aug 3, 2026
Last Modified: Aug 3, 2026

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