CVE-2026-8763
CriticalCVSS 9.3Summary
In Bouncy Castle for Java before 1.85, Name Constraints can be bypassed via a trailing dot in rfc822Name and URI. This issue also affects LTS before 2.73.12 and FIPS before appropriate versions.
Risk Assessment
An attacker can bypass name constraints in certificates, potentially allowing the use of a certificate for an unauthorized domain or email address, violating security policy.
Recommendation
Upgrade Bouncy Castle to version 1.85 or later (for the regular version), to 2.73.12 or later (for LTS), and to the appropriate FIPS versions.
Original NVD description (English source)
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).