High severity7.5OSV Advisory· Published Aug 3, 2026· Updated Sep 2, 2026

CVE-2026-12816

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

Legion Of The Bouncy Castle Inc./Bc Lts JavaOSV
Range: r2rv73dot11, r2rv73dot10, r2rv73dot9, …
osv-coords2 versions
pkg:rpm/opensuse/bouncycastle&distro=openSUSE%20Tumbleweed pkg:rpm/opensuse/bouncycastle&distro=openSUSE%20Leap%2016.0
< 1.85-1.1+ 1 more
- (no CPE)range: < 1.85-1.1
- (no CPE)range: < 1.85-160000.1.1
Legion Of The Bouncy Castle Inc./Bc Javallm-create
Range: <1.85, <2.73.12

Patches

Vulnerability mechanics

References

github.com/bcgit/bc-java/commit/6d9e4bbaee9409713ada167e5f901554cbb084acnvdPatch

News mentions

Bouncy Castle for Java: 25 Vulnerabilities Disclosed Together on August 3, 2026
Vypr Intelligence · Aug 3, 2026
Bouncy Castle for Java: 25 Vulnerabilities Disclosed in Single Batch on August 3, 2026
Vypr Intelligence · Aug 3, 2026

cvss	0.488
epss	0.000
exploit	0.000
kev	0.000
patch	-0.070
ransomware	0.000