Vulnerability DatabaseCVE-2026-12816
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CVE-2026-12816
Published:August 03, 2026
Updated:August 06, 2026
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 Packages
https://github.com/bcgit/bc-java.git (GITHUB):
Affected version(s) >=r1rv60 <r1rv85
Fix Suggestion:
Update to version r1rv85
org.bouncycastle:bcprov-jdk15to18 (JAVA):
Affected version(s) >=1.63 <1.85
Fix Suggestion:
Update to version 1.85
org.bouncycastle:bcprov-lts8on (JAVA):
Affected version(s) >=2.73.0 <2.73.12
Fix Suggestion:
Update to version 2.73.12
org.bouncycastle:bcprov-jdk18on (JAVA):
Affected version(s) >=1.71 <1.85
Fix Suggestion:
Update to version 1.85
Related Resources (9)
https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/12xxx/CVE-2026-12816.json
https://www.bouncycastle.org/download/bouncy-castle-java/
https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%9012816
https://github.com/bcgit/bc-java/wiki/CVE-2026-12816
https://github.com/bcgit/bc-java
https://github.com/bcgit/bc-lts-java
https://github.com/bcgit/bc-java/commit/6d9e4bbaee9409713ada167e5f901554cbb084ac
https://nvd.nist.gov/vuln/detail/CVE-2026-12816
https://www.bouncycastle.org/download/bouncy-castle-java-lts/
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CVSS v4
Base Score:
8.7
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
HIGH
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
7.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
HIGH
Availability
NONE
Weakness Type (CWE)
Improper Validation of Integrity Check Value
CWE-354
EPSS
Base Score:
0.16