Crossref incident

Metadata Plus REST API not validating API keys

Critical Resolved View vendor source →

Crossref experienced a critical incident on October 5, 2026 affecting Plus REST API, lasting 4h 3m. The incident has been resolved; the full update timeline is below.

Started
Oct 05, 2026, 12:21 PM UTC
Resolved
Oct 05, 2026, 04:25 PM UTC
Duration
4h 3m
Detected by Pingoru
Oct 05, 2026, 12:21 PM UTC

Affected components

Plus REST API

Update timeline

  1. investigating Oct 05, 2026, 12:21 PM UTC

    Request to the Metadata Plus pool of the REST API are receiving 401 responses (access denied). We are investigating the cause.

  2. investigating Oct 05, 2026, 12:41 PM UTC

    The API is back up but we are still investigating and monitoring.

  3. investigating Oct 05, 2026, 12:49 PM UTC

    We are continuing the investigate the outage. The Plus pool was down between 12:00 and 12:36 on 5 Oct, 2026.

  4. monitoring Oct 05, 2026, 01:01 PM UTC

    A fix has been implemented and we are continuing to monitor the performance of the Metadata Plus pool.

  5. resolved Oct 05, 2026, 04:25 PM UTC

    We have identified the problem due to a bug in a deployment. The deployment was reversed and the Plus pool of the API is working normally again.