Grenoble, France - Febuary 23, 2026
## PostgreSQL credcheck extension
The credcheck PostgreSQL extension provides few general credential checks,
which will be evaluated during the user creation, during the password change
and user renaming. By using this extension, we can define a set of rules:
* allow a specific set of credentials
* reject a certain type of credentials
* deny password that can be easily cracked
* enforce use of an expiration date with a minimum of day for a password
* define a password reuse policy
* define the number of authentication failure allowed before a user is banned
* define a delay on authentication failures
* force users to change their password after first login
* throw a warning N days before when the password user is about to expire
Release 4.6 has been published, it is a security fix release. If you are running
v4.5 please upgrade as soon as possible.
- Fix security issue with `ALTER ROLE current_role` that allow to change
superusers password.
- Fix event trigger for password expiration warning when time diff are
negative values.
- Disable the login event trigger when `credcheck.password_valid_warning`
is not defined or set to 0.
If you are using the password expiration warning feature you should
execute the event_trigger.sql in each database where it is defined.
Upgrade require a PostgreSQL restart to reload the credcheck library.
Complete list of changes and acknowledgements are available
[here](https://github.com/HexaCluster/credcheck/releases/tag/v4.6)
## Links & Credits
credcheck is an open project under the PostgreSQL license maintained by
[HexaCluster](https://github.com/HexaCluster/credcheck/).
Any contribution to build a better tool is welcome. You can send your ideas,
features requests or patches
using the GitHub tools.
**Links :**
* Download:
[https://github.com/HexaCluster/credcheck/releases/](https://github.com/HexaCluster/credcheck/releases/)
* Support: use GitHub report tool at
[https://github.com/HexaCluster/credcheck/issues](https://github.com/HexaCluster/credcheck/issues)
## About credcheck
The credcheck extension is developed and maintained by Gilles Darold at
[https://hexacluster.ai](HexaCluster Corp). If you need more information please
[https://hexacluster.ai/contact-us/](contact us).
Documentation at
[https://github.com/HexaCluster/credcheck#readme](https://github.com/HexaCluster/credcheck#readme)
