CVE-2026-12816: IESEngine stream-mode MAC forgery via length-dependent KDF split

Published Aug 3, 2026
·
Updated

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.

Affected Software

2 affected components
Bouncy Castle Bouncy Castle for Java<1.85
Bouncy Castle for Java LTS<2.73.12

Event History

Aug 3, 2026
CVE Published
via MITRE·02:53 AM
Data Sourced
via MITRE·02:53 AM
DescriptionWeakness
Data Sourced
via NVD·04:16 AM
DescriptionSeverityWeakness
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Frequently Asked Questions

1

What is the severity of CVE-2026-12816?

CVE-2026-12816 has a high severity score of 8.7.

2

How do I fix CVE-2026-12816?

To resolve CVE-2026-12816, upgrade to Bouncy Castle for Java version 1.85 or later, or Bouncy Castle for Java LTS version 2.73.12 or later.

3

What impact does CVE-2026-12816 have on my application?

CVE-2026-12816 could allow attackers to forge MACs in stream-mode, compromising data integrity.

4

Which versions of Bouncy Castle are affected by CVE-2026-12816?

Bouncy Castle for Java versions prior to 1.85 and Bouncy Castle for Java LTS versions before 2.73.12 are affected by CVE-2026-12816.

5

Is CVE-2026-12816 a remote exploit?

Yes, CVE-2026-12816 can potentially be exploited remotely due to its nature within the application.

Contact

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