Vulnerability DatabaseCVE-2026-59644
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CVE-2026-59644
Published:August 03, 2026
Updated:August 04, 2026
In Bouncy Castle for Java before 1.85, MLS hash-ratchet honours arbitrary 32-bit generation counter from sender.
Affected Packages
https://github.com/bcgit/bc-java.git (GITHUB):
Affected version(s) >=r1rv73 <r1rv85
Fix Suggestion:
Update to version r1rv85
org.bouncycastle:bcmls-jdk18on (JAVA):
Affected version(s) >=1.78 <1.85
Fix Suggestion:
Update to version 1.85
Related Resources (7)
https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/59xxx/CVE-2026-59644.json
https://www.bouncycastle.org/download/bouncy-castle-java/
https://github.com/bcgit/bc-java
https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%9059644
https://nvd.nist.gov/vuln/detail/CVE-2026-59644
https://github.com/bcgit/bc-java/commit/610d8757d855afe197df0de6d831cb75c81e3b9f
https://github.com/bcgit/bc-java/wiki/CVE-2026-59644
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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
NONE
Vulnerable System Availability
HIGH
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
NONE
Availability
HIGH
Weakness Type (CWE)
Excessive Iteration
CWE-834
EPSS
Base Score:
0.26