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CVE-2026-8763 is an improper certificate validation flaw in Bouncy Castle for Java certificate path processing that allows X.509 Name Constraints enforcement to be bypassed for rfc822Name and URI subject alternative name values containing a trailing dot. The issue affects Bouncy Castle for Java before 1.85, Bouncy Castle for Java LTS before 2.73.12, and Bouncy Castle for Java FIPS before 1.0.2.7 on the 1.0.x branch, 2.0.2 on the 2.0.x branch, and 2.1.3 on the 2.1.x branch. In PKIXNameConstraintValidator, the dNSName validation path normalizes names by stripping trailing dots before comparison, but the rfc822Name and URI validation paths, including isEmailConstrained and isURIConstrained, compare the extracted host using a bare case-insensitive equality check without equivalent normalization. As a result, a constrained host value with a trailing dot can fail to match an excluded subtree that should block it, causing certificate path validation to incorrectly succeed.
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