v26.1.11

Features

• rpk --print-tree: emits the full rpk command tree as a single JSON document, suited for LLMs and automations. by @r-vasquez in #30834

Bug Fixes

• Fix consumer group lag metrics inflated after retention or trim-prefix. by @bartoszpiekny-redpanda in #30870
• Fixed shadow link replication advancing the shadow partition start
  offset past the source partition's start offset when a replicator
  resumes after a shadow partition leadership change. by @Lazin in #30819
• Fixes a bug in which hung requests to the schema registry or in shadow linking could cause a deadlock during shutdown. by @WillemKauf in #30788
• Fixes a crash that could occur in the Cloud Topics metastore upon certain errors from during metastore database compaction. by @andrwng in #30775
• Fixes a wedge in multi-output transforms where a produce failure on one output topic silently stalled the processor instead of restarting it. by @WillemKauf in #30855
• Upgrade krb5 to 1.22.2 to address CVE-2026-40355 and CVE-2026-40356 (NegoEx parsing vulnerabilities). by @tyson-redpanda in #30874
• #30561 Fixed a bug in the schema registry where adding a new required field to a JSON schema was incorrectly allowed under BACKWARD compatibility mode. by @TheJohnMatti in #30563

Improvements

• Optimize compaction logic, especially for large batches. by @WillemKauf in #30760
• ct/l1: check is_linked() on owner shard by @WillemKauf in #30747
• build/deps: upgrade openssl to 3.5.7 by @tyson-redpanda in #30813
• ct/scale: raise fetch concurrency for cloud_topics MPT variants by @oleiman in #30867
• cluster: remove shard aggregation for max_offset and under_replicated_partitions by @WillemKauf in #30877

Full Changelog: v26.1.10...v26.1.11