PT-2026-67017 · Legion Of The Bouncy Castle · Bc-Java+1

CVE-2026-12816 · Published 2026-08-03 · Updated 2026-08-03

NVD

CVSS v4.0

8.7

High

Base vector

AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:Amber

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.

Exploit

Fix

Weakness Enumeration

CWE-354

Related Identifiers

CVE-2026-12816

Affected Products

Bc-Java

Bc-Lts-Java

References · 3

• 🔥 https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%9012816 · Exploit
• https://github.com/bcgit/bc-java/commit/6d9e4bbaee9409713ada167e5f901554cbb084ac · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-12816 · Security Note