CVE-2026-59644

Published Aug 3, 2026 Modified Aug 4, 2026 CWE-834

Description

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

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EPSS — Exploit Prediction

0.0026

Probability of exploitation

0.18%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-834 CWE-834

References

Other References

https://github.com/bcgit/bc-java/commit/610d8757d855afe197df0de6d831cb75c81e3b9f https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%9059644

Frequently Asked Questions

What is CVE-2026-59644? +

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

How do I check if I'm vulnerable to CVE-2026-59644? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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