Around 02:04 Korean time on 2026-10-23, the official GitHub repository published stable versions 4.0.9 and 4.1.2 and prerelease 4.2.0-RC1. The 4.0.9 notes list fixes including JWT rejection for a combination of empty issuer-uri and jwk-set-uri values, nested JAR contention and manifest handling, and hangs during shutdown. 4.2.0-RC1 includes optimizations to nested JAR reading and class and resource lookup, along with various fixes. The individual 4.1.2 release body is empty, so specific changes were not inferred. Developers should distinguish stable releases from the RC and check the changes relevant to their version line.
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