CVE-2026-59644

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

State: Published
Severity: 8.7 High
Published: Aug 3, 2026
Updated: Aug 3, 2026
Reserved: Jul 6, 2026

Description

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

Scores

CVSS	Score	Vector	Source
4.0	8.7 High	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	bcorg

Weaknesses

CWE-834 Excessive Iteration

Affected Products

Product	Versions
BC-JAVALegion of the Bouncy Castle Inc.	1.73 to before 1.85Affected

References

https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%9059644vendor-advisory
https://github.com/bcgit/bc-java/commit/610d8757d855afe197df0de6d831cb75c81e3b9fpatch

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