CVE-2026-59644

MLS hash-ratchet honours arbitrary 32-bit generation counter from sender

Published Aug 3, 2026 CVSS 4.0 · 8.7 High EPSS < 1% KEV · Not listed
Description
In Bouncy Castle for Java before 1.85, MLS hash-ratchet honours arbitrary 32-bit generation counter from sender.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared Bouncycastle
Bouncycastle bc-java
CPEs cpe:2.3:a:bouncycastle:bc-java:*:*:*:*:*:*:*:*
Vendors & Products Bouncycastle
Bouncycastle bc-java
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

Type Values Removed Values Added
First Time appeared Legion Of The Bouncy Castle Inc.
Legion Of The Bouncy Castle Inc. bc-java
Vendors & Products Legion Of The Bouncy Castle Inc.
Legion Of The Bouncy Castle Inc. bc-java
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description In Bouncy Castle for Java before 1.85, MLS hash-ratchet honours arbitrary 32-bit generation counter from sender.
Title MLS hash-ratchet honours arbitrary 32-bit generation counter from sender
Weaknesses CWE-834
References
Metrics cvssV4_0

{'score': 8.7, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/U:Amber'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
bcorg
Published
Updated
Aug 3, 2026, 1:36 PM
Reserved
Jul 6, 2026, 6:58 AM
Status
Analyzed
Published
Aug 3, 2026, 1:16 AM
Modified
Oct 23, 2026, 10:10 PM