CVE-2025-41256: Iterate GmbH Cyberduck

High severity, CVSS 7.4. EPSS: 0.1% chance of exploitation in the next 30 days.

Cyberduck and Mountain Duck improper handle TLS certificate pinning for untrusted certificates (e.g., self-signed), since the certificate fingerprint is stored as SHA-1, although SHA-1 is considered weak. This issue affects Cyberduck: through 9.1.6; Mountain Duck: through 4.17.5.

Affected products

• Iterate GmbH Cyberduck: up to and including 9.1.6
• Iterate GmbH Mountain Duck: up to and including 4.17.5

Published 2025-06-25. Last modified 2026-06-17.