Vulnerability Intelligence Report
Name Constraints bypass via trailing dot in rfc822Name and URI
CVE-2026-8763
In Bouncy Castle for Java before 1.85, Name Constraints bypass via trailing dot in rfc822Name and URI. This issue also affects Bouncy Castle for Java LTS before 2.73.12, and Bouncy Castle for Java FIPS (BC-FJA) before bc-fips 1.0.2.7 (1.0.X series), 2.0.2 (2.0.X series) and 2.1.3 (2.1.X series).
No Active Exploit Signals
CVSS Base Score
9.3
CRITICAL
EPSS Probability:0.43%
Executive Threat Verdict
Evaluating...
Evaluating Threat Landscape...
Assessing known weaponization, exploitation telemetry, and federal advisories.
Attack Surface
—
Authentication
—
Weaponization
—
SSVC Action
—
Weaknesses (CWE)
CWE-295 ↗CWE-295 Improper Certificate 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) |
| Legion of the Bouncy Castle Inc. | BC-FJA | 1.0.0 < 1.0.2.7 (affected), 2.0.0 < 2.0.2 (affected), 2.1.0 < 2.1.3 (affected) |
References & Technical Advisories
No reference links found.
Threat Intelligence Signals
EPSS Score
0.430%
GitHub Advisory
Identity & Timeline
| Status | PUBLISHED |
| Assigning Authority | Legion of the Bouncy Castle Inc. · Open Source · Australia |
| Reserved | 2026-05-17T06:03:57 |
| Published | 2026-08-03T00:36:05 |
| Last Updated | 2026-10-05T01:16:57 |
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