---
id: CVE-2026-59644
title: >-
  In Bouncy Castle for Java before 1.85, MLS hash-ratchet honours arbitrary
  32-bit generation counter from sender.
summary: >-
  In Bouncy Castle for Java before 1.85, MLS hash-ratchet honours arbitrary
  32-bit generation counter from sender.
severity: none
cwe:
  - CWE-834
published: '2026-08-03'
updated: '2026-08-03'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-59644'
references:
  - url: >-
      https://github.com/bcgit/bc-java/commit/610d8757d855afe197df0de6d831cb75c81e3b9f
    label: 91579145-5d7b-4cc5-b925-a0262ff19630
  - url: 'https://github.com/bcgit/bc-java/wiki/CVE-2026-59644'
    label: 91579145-5d7b-4cc5-b925-a0262ff19630
tags:
  - nvd
ingestedAt: '2026-08-03T01:21:07.872Z'
epss: 0.0031
epssPercentile: 0.24087
---

## Overview

In Bouncy Castle for Java before 1.85, MLS hash-ratchet honours arbitrary 32-bit generation counter from sender.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.