Language install fails and OPAC REST API returns 503
Languages selected during installation are not installed, and the OPAC REST API may return a 503 error.
- Published
- May 28, 2026
- Last Updated
- May 29, 2026
- Affected Versions
- Koha AMI builds released before 2026-05-29
- Fixed In
- Koha v25.11.04-1 (AMI build 2026-05-29)
Overview
Customers may observe that languages selected during Koha installation are not available in the system. Additionally, API calls to the OPAC REST API may fail with a 503 error, indicating that the service is temporarily unavailable. These issues can impact library operations that rely on specific languages or API functionality.
Affected Versions
- Koha AMI builds released before 2026-05-28.
Remediation
Option 1: Upgrade to Patched AMI
When a patched AMI is available on AWS Marketplace, launch a new instance from it and migrate your data. See the migration guide for step-by-step instructions.
Option 2: Apply Interim Mitigation
No interim mitigation is available. Upgrade to the patched AMI when released.
Option 3: Contact Support
If you are unsure how to apply the above steps, contact us at [email protected] or use the contact form. We can walk you through the fix remotely.
Timeline
| Date | Event |
|---|---|
| 2026-05-25 | Issue identified |
| 2026-05-28 | Advisory published |
| 2026-05-29 | Patched AMI published to AWS Marketplace |