CVE-2026-12803

HighCVSS 7.5/10Last modified Sep 2, 2026

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.

Metrics

CVSS 3.1 7.5/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Weakness enumeration

CWE-354

Affected software

No affected versions have been published.

Timeline

Published: Aug 3, 2026
Last modified: Sep 2, 2026
NVD status: Analyzed

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