Universiteit Leiden

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Library

Access issues with several library systems

21 October 2026

Due tot a critical issue in a programming language commonly used for many websites (PHP), there are website access issues worldwide. Many websites have been taken offline, as a precautionary measure.  The issue is affecting several university and library websites as well. Some systems can be reached using EduVPN only; in case a link does not seem to work properly, please try using the VPN.

Still working:

  • The Catalogue
  • Ordering books
  • LUCRIS
  • Using our contact form
  • SharedDesk (study places booking system)

Some sites can be publicly reached only by using an alternative link:

Sites we know are not working at the moment:

A PHP update has been announced for later this afternoon (21-10). This update will be applied as soon as possible, however this may take some time and/or show other issues.

Requested books

Not all requested library materials will be available at the lockers. Some items will be available via the desk, at those library locations where a library desk is open. Please ask our desk staff for assistance.

As soon as we know more regarding the PHP issue, we will update this notice.

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