PT-2025-26818 · Cyberduck+1 · Cyberduck+1

Andreas Boll + 1 · Published 2025-06-25 · Updated 2025-06-30 · CVE-2025-41256

Positive Technologies (AI Summary)

CVSS v3.1

7.4

High

Base vector

AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Name of the Vulnerable Software and Affected Versions: Cyberduck versions through 9.1.6 Mountain Duck versions through 4.17.5

Description: The issue is related to improper handling of TLS certificate pinning for untrusted certificates, such as self-signed certificates, in Cyberduck and Mountain Duck. The certificate fingerprint is stored as SHA-1, which is considered weak.

Recommendations: For Cyberduck versions through 9.1.6, consider updating to a version that properly handles TLS certificate pinning. For Mountain Duck versions through 4.17.5, consider updating to a version that properly handles TLS certificate pinning. As a temporary workaround, consider disabling the use of SHA-1 for certificate fingerprints in both Cyberduck and Mountain Duck until a patch is available.

Exploit

Fix

Weakness Enumeration

CWE-328

Related Identifiers

CVE-2025-41256

GHSA-688C-VJRC-84RV

Affected Products

Cyberduck

Mountain Duck

References · 9

• 🔥 https://github.com/iterate-ch/cyberduck/security/advisories/GHSA-688c-vjrc-84rv · Exploit
• 🔥 https://github.com/sbaresearch/advisories/tree/public/2025/SBA-ADV-20250325-02_Cyberduck_Mountain_Duck_Weak_Hash · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2025-41256 · Security Note
• https://osv.dev/vulnerability/CVE-2025-41256 · Vendor Advisory
• https://t.me/cvetracker/27005 · Telegram Post
• https://twitter.com/cracbot/status/1939640106023084500 · Twitter Post
• https://twitter.com/CVEnew/status/1937809340456476677 · Twitter Post
• https://twitter.com/VulmonFeeds/status/1937831756129865884 · Twitter Post
• https://t.me/cvenotify/126612 · Telegram Post