# Redpanda v26.1.15

- Product: Redpanda (https://whatsnew.fyi/product/redpanda)
- Vendor: Redpanda Data
- Date: 2026-08-07
- Version: v26.1.15
- Original notes: https://github.com/redpanda-data/redpanda/releases/tag/v26.1.15
- Permalink: https://whatsnew.fyi/product/redpanda/releases/v26.1.15

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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- **fixed** — Fix the registered config name for leader_balancer_node_mute_timeout
- **fixed** — Fix a bug in which L0 batches in a cloud topic forgot to preserve last_offset_delta in their header, leading to an under-declared last offset which can stall consumers, skip records, or halt exact-offset replication
- **fixed** — Fix a bug in which topics with min.compaction.lag.ms left unconfigured with produced batches holding timestamps in the future would be considered ineligible for compaction
- **fixed** — Fix a bug in which transient TOPIC_AUTHORIZATION_FAILED errors and SASL authentication failures were possible during application of a controller snapshot
- **fixed** — Fix a bug where corrupted storage would not yield a bad CRC in returned record batches
- **fixed** — Fix a bug where having a cloud topic read replica on a given cluster would prevent L0 objects on that cluster from being garbage collected
- **fixed** — Updating a Shadow Link that uses PLAIN authentication no longer fails when the password is omitted; the stored password is preserved
- **fixed** — rpk connect install --connect-version no longer rejects versions with a segment of three or more digits, which had blocked pinning any Redpanda Connect release since 4.100.0
- **fixed** — rpk security secrets list no longer truncates its output at 100 secrets
- **fixed** — rpk shadow create no longer fails secret-reference validation on clusters with more than one page of REDPANDA_CLUSTER-scoped secrets
- **changed** — rpk shadow update in editor mode now replaces the entire Shadow Link configuration instead of merging changed fields, so list-valued fields can shrink or be cleared
- **fixed** — Fix an issue where /v1/usage responses could cause oversized allocations for clusters with a large number of Iceberg-enabled topics
- **changed** — rpk cluster health will now display any nodes that may be in maintenance mode

##### Bug Fixes
* Fix the registered config name for  `leader_balancer_node_mute_timeout`. by @WillemKauf in [#31360](https://github.com/redpanda-data/redpanda/pull/31360)
* Fixes a bug in which L0 batches in a cloud topic forgot to preserve `last_offset_delta` in their header, leading to an under-declared last offset which can stall consumers, skip records, or halt exact-offset replication. by @WillemKauf in [#31363](https://github.com/redpanda-data/redpanda/pull/31363)
* Fixes a bug in which topics with `min.compaction.lag.ms` left unconfigured with produced batches holding timestamps in the future would be considered ineligible for compaction by @WillemKauf in [#31459](https://github.com/redpanda-data/redpanda/pull/31459)
* Fixes a bug in which transient `TOPIC_AUTHORIZATION_FAILED` errors and SASL authentication failures were possible during application of a controller snapshot. by @WillemKauf in [#31437](https://github.com/redpanda-data/redpanda/pull/31437)
* Fixes a bug where corrupted storage would not yield a bad CRC in returned record batches. by @andrwng in [#31388](https://github.com/redpanda-data/redpanda/pull/31388)
* Fixes a bug where having a cloud topic read replica on a given cluster would prevent L0 objects on that cluster from being garbage collected. by @andrwng in [#31391](https://github.com/redpanda-data/redpanda/pull/31391)
* Updating a Shadow Link that uses PLAIN authentication no longer fails when the password is omitted; the stored password is preserved. by @r-vasquez in [#31421](https://github.com/redpanda-data/redpanda/pull/31421)
* [#31448](https://github.com/redpanda-data/redpanda/issues/31448) `rpk connect install --connect-version` no longer rejects versions with a
segment of three or more digits, which had blocked pinning any Redpanda Connect
release since 4.100.0. Malformed versions with trailing characters are now
rejected during validation rather than failing at download. by @prakhargarg105 in [#31449](https://github.com/redpanda-data/redpanda/pull/31449)
* `rpk security secrets list` no longer truncates its output at 100 secrets. by @simon0191 in [#31436](https://github.com/redpanda-data/redpanda/pull/31436)
* `rpk shadow create` no longer fails secret-reference validation on clusters
with more than one page of `REDPANDA_CLUSTER`-scoped secrets. by @simon0191 in [#31436](https://github.com/redpanda-data/redpanda/pull/31436)
* `rpk shadow update` in editor mode now replaces the entire Shadow Link configuration instead of merging changed fields, so list-valued fields (e.g. topic filters) can shrink or be cleared. by @r-vasquez in [#31421](https://github.com/redpanda-data/redpanda/pull/31421)

##### Improvements
* [#31335](https://github.com/redpanda-data/redpanda/issues/31335) Fixes an issue where `/v1/usage` responses could cause oversized allocations for clusters with a large number of Iceberg-enabled topics. by @WillemKauf in [#31337](https://github.com/redpanda-data/redpanda/pull/31337)
* `rpk cluster health` will now display any nodes that may be in maintenance mode. by @alextreichler in [#31352](https://github.com/redpanda-data/redpanda/pull/31352)

**Full Changelog**: https://github.com/redpanda-data/redpanda/compare/v26.1.14...v26.1.15