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PG-2503 - Add PSP 18.4.2 release notes
This PR adds the release notes for version 18.4.2, as well as minor modifications to the release notes dates in the sidebar nav menu.
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‎docs/release-notes/release-notes-v18.4.2.md‎

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# Percona Distribution for PostgreSQL 18.4.2 ({{date.18_4_2}})
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--8<-- "release-notes-intro.md"
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This release of Percona Distribution for PostgreSQL is based on Percona Server for PostgreSQL 18.4.2 - a binary compatible, open source drop in replacement of [PostgreSQL Community 18.4](https://www.postgresql.org/docs/18/release-18-4.html).
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## Release Highlights
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This release continues to deliver Percona’s open source value-add components for enterprise use cases, `pg_tde` 2.2.1 for Transparent Data Encryption and more. See the full component list below for details.
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!!! note
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`pg_tde` 2.2.1 requires Percona Distribution for PostgreSQL 18.4 at minimum. Earlier versions of PPG are not supported with this release of `pg_tde`.
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To upgrade from earlier versions (e.g. Percona Distribution for PostgreSQL 17.x), follow the steps in [Upgrading Percona Distribution for PostgreSQL](../major-upgrade.md).
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### Tarball updates
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The binary tarballs for x86_64 and ARM64 architectures have been updated in this release. The following libraries and components have new versions:
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- postgres-common: 290
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- pgBouncer: 1.25.2
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- etcd: 3.5.30
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- pysyncobj: 0.3.15
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- haproxy: 2.8.23
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- patroni: 4.1.3
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- pgpool2: 4.7.1
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- postgis: 3.5.6
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- pg_gather: 33
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- pg_cron: 1.6.7
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- pg_tde: 2.2.0
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See [Install Percona Distribution for PostgreSQL from binary tarballs](../tarball.md) for the download links.
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### Addressed CVEs
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This release includes important security measures that address the following CVEs: TBD. For more details, see the [PostgreSQL 18.4 release notes](https://www.postgresql.org/docs/18/release-18-4.html).
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## Known Issues
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### For minor & major upgrades (RHEL only)
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During an upgrade on RHEL, you may encounter the following error:
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```bash
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Unknown Error occurred: Transaction test error:
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file /usr/share/postgresql-common/server/postgresql.mk from install of percona-postgresql-common conflicts with file from package percona-postgresql-common-dev
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file /usr/share/postgresql-common/t/040_upgrade.t from install of percona-postgresql-common conflicts with file from package percona-postgresql-common-dev
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```
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To resolve this, remove the `percona-postgresql-common-dev` package and reinstall it with the new intended upgraded PPG/PSP server.
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## MD5 Authentication Deprecated
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The md5 password authentication is deprecated now and will be removed in a future release.
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## Supplied third-party extensions
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Review each extension’s release notes for What’s new, improvements, or bug fixes.
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The following is the list of extensions available in Percona Distribution for PostgreSQL.
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| Extension | Version | Description |
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| --- | --- | --- |
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| [etcd :octicons-link-external-16:](https://etcd.io/) | 3.5.30 | A distributed, reliable key-value store for setting up highly available Patroni clusters |
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| [python-etcd :octicons-link-external-16:](https://python-etcd.readthedocs.io/en/latest/) | 0.4.5 | A Python client library for interacting with etcd |
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| [HAProxy :octicons-link-external-16:](https://www.haproxy.org/) | 2.8.23 | A high-availability and load-balancing solution |
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| [Patroni :octicons-link-external-16:](https://patroni.readthedocs.io/en/latest/) | 4.1.3 | A HA (High Availability) solution for PostgreSQL |
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| [PgAudit :octicons-link-external-16:](https://www.pgaudit.org/) | 18 | A detailed session or object audit logging via the standard logging facility provided by PostgreSQL |
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| [pgAudit set_user :octicons-link-external-16:](https://github.com/pgaudit/set_user) | 4.2.0 | Provides an additional layer of logging and control when unprivileged users must escalate roles for maintenance |
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| [pgBackRest :octicons-link-external-16:](https://pgbackrest.org/) | 2.58.0 | A backup and restore solution for PostgreSQL |
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| [pgBadger :octicons-link-external-16:](https://github.com/darold/pgbadger) | 13.2 | A fast PostgreSQL log analyzer |
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| [PgBouncer :octicons-link-external-16:](https://www.pgbouncer.org/) | 1.25.2 | A lightweight connection pooler for PostgreSQL |
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| [pg_cron :octicons-link-external-16:](https://github.com/citusdata/pg_cron) | 1.6.7 | A simple cron-based job scheduler for PostgreSQL |
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| [pg_gather :octicons-link-external-16:](https://github.com/jobinau/pg_gather) | v33 | An SQL script for running diagnostics on the health of a PostgreSQL cluster |
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| [pg_oidc_validator](https://github.com/Percona-Lab/pg_oidc_validator) | 1.0 | OAuth validator library for PostgreSQL 18 |
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| [pg_repack :octicons-link-external-16:](https://github.com/reorg/pg_repack) | 1.5.3 | Rebuilds PostgreSQL database objects |
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| [pg_stat_monitor](https://github.com/percona/pg_stat_monitor) | 2.3.2 | Collects and aggregates statistics for PostgreSQL and provides histogram information |
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| [pg_tde :octicons-link-external-16:](https://github.com/percona/pg_tde) | v2.2.0 | A PostgreSQL extension that provides Transparent Data Encryption (TDE) to protect data at rest |
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| [pg_vector](https://github.com/pgvector/pgvector) | v0.8.2 | A vector similarity search extension for PostgreSQL |
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| [pgpool2 :octicons-link-external-16:](https://git.postgresql.org/gitweb/?p=pgpool2.git;a=summary) | 4.7.1 | A middleware between PostgreSQL server and client for high availability, connection pooling, and load balancing |
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| [PostGIS :octicons-link-external-16:](https://github.com/postgis/postgis) | 3.5.6 | A spatial extension for PostgreSQL |
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| [PostgreSQL Commons :octicons-link-external-16:](https://salsa.debian.org/postgresql/postgresql-common) | 290 | PostgreSQL database-cluster manager. Supports multiple PostgreSQL versions and clusters simultaneously |
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| [wal2json :octicons-link-external-16:](https://github.com/eulerto/wal2json) | 2.6 | A PostgreSQL logical decoding JSON output plugin |
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For Red Hat Enterprise Linux 8 and compatible derivatives, Percona Distribution for PostgreSQL also includes the supplemental `python3-etcd` 0.4.5 packages, which are used for setting up Patroni clusters.
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Percona Distribution for PostgreSQL is also shipped with the [libpq](https://www.postgresql.org/docs/18/libpq.html) library. It contains "a set of library functions that allow client programs to pass queries to the PostgreSQL backend server and to receive the results of these queries."

‎docs/release-notes/release-notes.md‎

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## 2026
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* [18.4.2](release-notes-v18.4.2.md) ({{date.18_4_2}})
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* [18.4.1](release-notes-v18.4.1.md) ({{date.18_4_1}})
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* [18.3.1](release-notes-v18.3.1.md) ({{date.18_3_1}})
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‎docs/templates/pdf_cover_page.tpl‎

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{% if config.site_description %}
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<h1>{{ config.site_description }}</h1>
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{% endif %}
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<h2>18.4.1 (May 20, 2026)</h2>
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<h2>18.4.2 (July 30, 2026)</h2>
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<!--<h3>Percona Technical Documentation Team</h3>-->
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‎mkdocs.yml‎

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- Uninstall: uninstalling.md
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- Release notes:
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- "Release notes index": release-notes/release-notes.md
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- "18.4.1": release-notes/release-notes-v18.4.1.md
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- "18.3.1": release-notes/release-notes-v18.3.1.md
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- "18.4.2 ({{date.18_4_2}})": release-notes/release-notes-v18.4.2.md
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- "18.4.1 ({{date.18_4_1}})": release-notes/release-notes-v18.4.1.md
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- "18.3.1 ({{date.18_3_1}})": release-notes/release-notes-v18.3.1.md
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- "2025":
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- "18.1.1": release-notes/release-notes-v18.1.1.md
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- "18.1.1 ({{date.18_1_1}})": release-notes/release-notes-v18.1.1.md
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- Reference:
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- Licensing: licensing.md
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- Versioning: versioning.md

‎variables.yml‎

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# PG Variables set for HTML output
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# See also mkdocs.yml plugins.with-pdf.cover_subtitle and output_path
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release: 'release-notes-v18.4.1'
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release: 'release-notes-v18.4.2'
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dockertag: '18.4'
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pgsubversion: '18.4'
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pgversion: '18'
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pspgversion: '18.4.1'
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pspgversion: '18.4.2'
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pgsmversion: '2.3.2'
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pgbouncerversion: '1.25.2'
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pgbackrestversion: '2.58.0'
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date:
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18_4_2: 2026-07-30
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18_4_1: 2026-05-20
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18_3_1: 2026-03-02
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18_1_1: 2025-11-28

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