Redpanda v26.1.11 release notes

Redpanda v26.1.11

v26.1.11Jun 25, 2026 · about 2 months ago

Added 1

rpk --print-tree emits the full rpk command tree as a single JSON document, suited for LLMs and automations

Changed 3

Fixed 6

Fix consumer group lag metrics inflated after retention or trim-prefix
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
Fixes a bug in which hung requests to the schema registry or in shadow linking could cause a deadlock during shutdown
Fixes a crash that could occur in the Cloud Topics metastore upon certain errors during metastore database compaction
Fixes a wedge in multi-output transforms where a produce failure on one output topic silently stalled the processor instead of restarting it
Fixed a bug in the schema registry where adding a new required field to a JSON schema was incorrectly allowed under BACKWARD compatibility mode

Security 1

Upgrade krb5 to 1.22.2 to address CVE-2026-40355 and CVE-2026-40356 (NegoEx parsing vulnerabilities)

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

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

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: https://github.com/redpanda-data/redpanda/compare/v26.1.10...v26.1.11

Redpanda v26.1.11