PT-2026-67237 · Legion Of The Bouncy Castle · Bc-Java

CVE-2026-59644 · Published 2026-08-03 · Updated 2026-08-03

Mitre

CVSS v4.0

8.7

High

Base vector

AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/U:Amber

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

Exploit

Fix

Weakness Enumeration

CWE-834

Related Identifiers

CVE-2026-59644

Affected Products

Bc-Java

References · 3

• 🔥 https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%9059644 · Exploit
• https://github.com/bcgit/bc-java/commit/610d8757d855afe197df0de6d831cb75c81e3b9f · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-59644 · Security Note