Vulnerability Intelligence Report
MTI/A0 DH agreement exponentiates unvalidated peer value
CVE-2026-59650
In Bouncy Castle for Java before 1.85, MTI/A0 DH agreement exponentiates unvalidated peer value. This issue also affects Bouncy Castle for Java LTS before 2.73.12.
No Active Exploit Signals
CVSS Base Score
9.3
CRITICAL
EPSS Probability:0.26%
Executive Threat Verdict
Evaluating...
Evaluating Threat Landscape...
Assessing known weaponization, exploitation telemetry, and federal advisories.
Attack Surface
—
Authentication
—
Weaponization
—
SSVC Action
—
Weaknesses (CWE)
CWE-20 ↗CWE-20 Improper Input Validation
Affected Products & Versions
| Vendor | Product | Affected Versions |
|---|---|---|
| Legion of the Bouncy Castle Inc. | BC-JAVA | 0 < 1.85 (affected) |
| Legion of the Bouncy Castle Inc. | BC-LTS-JAVA | 2.73.0 < 2.73.12 (affected) |
References & Technical Advisories
No reference links found.
Threat Intelligence Signals
EPSS Score
0.263%
GitHub Advisory
Identity & Timeline
| Status | PUBLISHED |
| Assigning Authority | Legion of the Bouncy Castle Inc. · Open Source · Australia |
| Reserved | 2026-07-06T07:09:01 |
| Published | 2026-08-03T00:42:46 |
| Last Updated | 2026-08-03T13:32:53 |
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