# Redpanda v26.1.11

- Product: Redpanda (https://whatsnew.fyi/product/redpanda)
- Vendor: Redpanda Data
- Date: 2026-06-25
- Version: v26.1.11
- Original notes: https://github.com/redpanda-data/redpanda/releases/tag/v26.1.11
- Permalink: https://whatsnew.fyi/product/redpanda/releases/v26.1.11

What's New is an index, not a publisher: every entry below links to the vendor's own release notes, which are the authoritative source. Entries are labelled where they are hand-curated sample data, pre-releases, or drawn from a secondary source such as a developer blog.

Reuse: the summaries, labels and curation here are © What's New. Quote freely with attribution and a link back; wholesale republication of the corpus is not permitted — terms: https://whatsnew.fyi/terms. The vendors' own release notes remain their publishers'.

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- **added** — rpk --print-tree emits the full rpk command tree as a single JSON document, suited for LLMs and automations
- **fixed** — Fix consumer group lag metrics inflated after retention or trim-prefix
- **fixed** — 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
- **fixed** — Fixes a bug in which hung requests to the schema registry or in shadow linking could cause a deadlock during shutdown
- **fixed** — Fixes a crash that could occur in the Cloud Topics metastore upon certain errors during metastore database compaction
- **fixed** — Fixes a wedge in multi-output transforms where a produce failure on one output topic silently stalled the processor instead of restarting it
- **security** — Upgrade krb5 to 1.22.2 to address CVE-2026-40355 and CVE-2026-40356 (NegoEx parsing vulnerabilities)
- **fixed** — Fixed a bug in the schema registry where adding a new required field to a JSON schema was incorrectly allowed under BACKWARD compatibility mode
- **changed** — Optimize compaction logic, especially for large batches
- **changed** — Upgrade openssl to 3.5.7
- **changed** — Remove shard aggregation for max_offset and under_replicated_partitions metrics

##### 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](https://github.com/redpanda-data/redpanda/pull/30834)

##### Bug Fixes
* Fix consumer group lag metrics inflated after retention or trim-prefix. by @bartoszpiekny-redpanda in [#30870](https://github.com/redpanda-data/redpanda/pull/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](https://github.com/redpanda-data/redpanda/pull/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](https://github.com/redpanda-data/redpanda/pull/30788)
* Fixes a crash that could occur in the Cloud Topics metastore upon certain errors from during metastore database compaction. by @andrwng in [#30775](https://github.com/redpanda-data/redpanda/pull/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](https://github.com/redpanda-data/redpanda/pull/30855)
* Upgrade krb5 to 1.22.2 to address CVE-2026-40355 and CVE-2026-40356 (NegoEx parsing vulnerabilities). by @tyson-redpanda in [#30874](https://github.com/redpanda-data/redpanda/pull/30874)
* [#30561](https://github.com/redpanda-data/redpanda/issues/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](https://github.com/redpanda-data/redpanda/pull/30563)

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

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