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Panther Knowledge Base

Error "event exceeds maximum size: event at offset 1 is larger than xx Bytes" on Panther CloudTrail log source


I get the following error from my CloudTrail log source in Panther:

"error": "event exceeds maximum size: event at offset 1 is larger than X Bytes


To resolve this issue:

  1. Run the following query to check if the CloudTrail log source is currently ingesting logs:
p_occurs_between('2023-02-08 00:00:00Z','2023-02-10 23:59:00Z') AND p_source_label = '<log-source-name>'
ORDER by p_parse_time DESC
  • Make sure to customize the query based on your own timeframe for the unclassified event.
    • where p_occurs_between('<start-date-of-unclassified-event>','<current-date>') e.g 'YYYY-MM-DD HH:MM:SSZ' / '2023-02-16 23:59:00Z'

2. If logs after the unclassified event are ingesting, you can then backfill that unclassified event using our S3SNS tool.

Note: The unhealthy banner may still appear for 2-4 days after the unclassified event occurred, but the query above will confirm if your log source is currently ingesting as expected!


This issue occurs when the CloudTrail log source schema is disabled and re-enabled. There are processing rules that help handle larger log files, but the temporary disable may cause the rules to not take effect for a short bit of time.