CVE-2021-33038: Debian Linux

High severity, CVSS 7.5. EPSS: 1.9% chance of exploitation in the next 30 days.

An issue was discovered in management/commands/hyperkitty_import.py in HyperKitty through 1.3.4. When importing a private mailing list's archives, these archives are publicly visible for the duration of the import. For example, sensitive information might be available on the web for an hour during a large migration from Mailman 2 to Mailman 3.

Affected products

• Debian Debian Linux: version 10.0 only
• Hyperkitty Project Hyperkitty: up to and including 1.3.4

Published 2021-05-26. Last modified 2026-06-17.