CVE-2026-12816

HighCVSS 7.5/10Last modified Sep 2, 2026

Description

In Bouncy Castle for Java before 1.85, IESEngine stream-mode MAC forgery via length-dependent KDF split. 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

Vendor	Product	Versions
Legion of the Bouncy Castle Inc.	BC-JAVA	< 1.85
Legion of the Bouncy Castle Inc.	BC-LTS-JAVA	>= 2.73.0, < 2.73.12

References

https://github.com/bcgit/bc-java/commit/6d9e4bbaee9409713ada167e5f901554cbb084acPatch
https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%9012816Third Party Advisory, Patch

Timeline

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

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