CVE-2025-41256

High

Description

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.

SeverityHigh

CVSS7.4

Exploit probability—

ProductCyberduck

PublishedJun 25, 2025

First seenJun 25, 2025

Weakness typeCWE-328CWE-328

How to fix

Vendor advisories

github.com/iterate-ch/cyberduck/security/advisories/GHSA-688c-vjrc-84rv

Affected products

Product	Affected versions	Fixed in
iterate GmbH Cyberduck	v ≤ 9.1.6	—
iterate GmbH Mountain Duck	v ≤ 4.17.5	—

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