Upgrade Jenkins to 2.568.3 on Java 21 - #120
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Closes 20 CVEs: five core issues from security advisory 2026-08-05, thirteen from 2026-09-02, and two Jetty issues. The embedded Jetty moves from 12.0.25 to 12.1.12 via Winstone 8.1047.v331d3186f463, which is the patched version for CVE-2026-19203 and CVE-2026-12611. 2.568.2, the version the advisory asked for, is not enough on either count: it is superseded by the September advisory, and it ships Jetty 12.1.8, still inside the affected range for both Jetty CVEs. The JDK moves with it. Jenkins 2.555.1 dropped Java 17, and no -jdk17 image is published for the 2.568.x line. configuration-as-code, branch-api and cloudbees-folder are bumped because transitive dependencies now require newer versions than the previous pins allowed; without them the plugin manager cannot resolve the set. This is upstream drift rather than a consequence of the core upgrade. Verified against a local build of the image: plugins resolve, the JVM is Temurin 21.0.12.1, and winstone.jar reports Jetty 12.1.12.
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Closes 20 CVEs: five core issues from security advisory 2026-08-05, thirteen from 2026-09-02, and two Jetty issues. The embedded Jetty moves from 12.0.25 to 12.1.12 via Winstone 8.1047.v331d3186f463, which is the patched version for CVE-2026-19203 and CVE-2026-12611.
2.568.2, the version the advisory asked for, is not enough on either count: it is superseded by the September advisory, and it ships Jetty 12.1.8, still inside the affected range for both Jetty CVEs.
The JDK moves with it. Jenkins 2.555.1 dropped Java 17, and no -jdk17 image is published for the 2.568.x line.
configuration-as-code, branch-api and cloudbees-folder are bumped because transitive dependencies now require newer versions than the previous pins allowed; without them the plugin manager cannot resolve the set. This is upstream drift rather than a consequence of the core upgrade.
Verified against a local build of the image: plugins resolve, the JVM is Temurin 21.0.12.1, and winstone.jar reports Jetty 12.1.12.