CVE-2025-57785: Hiawatha.leisink Hiawatha Webserver

Medium severity, CVSS 6.5. EPSS: 0.4% chance of exploitation in the next 30 days.

A Double Free in XSLT `show_index` has been identified in Hiawatha webserver version 11.7 which allows an unauthenticated attacker to corrupt data which may lead to arbitrary code execution.

Affected products

• Hiawatha.leisink Hiawatha Webserver: version 11.7 only

Published 2026-01-26. Last modified 2026-06-17.