CVE-2026-58400: Geonetwork Core-Geonetwork

Critical severity, CVSS 9.1. EPSS: 1.2% chance of exploitation in the next 30 days.

GeoNetwork is a catalog application to manage spatially referenced resources. Prior to versions 4.4.12 and 4.2.17, the Saxon XSLT processor used to render formatters is configured without secure processing (`FEATURE_SECURE_PROCESSING`) and without disabling Java extension functions (`ALLOW_EXTERNAL_FUNCTIONS`). Any stylesheet loaded by GeoNetwork can therefore invoke `java.lang.Runtime.exec()` or `java.lang.ProcessBuilder` directly, achieving arbitrary command execution as the GeoNetwork process user. A user with sufficient privileges to upload a formatter can deliver a `.xsl` file containing Java extension call that execute arbitrary OS commands with the privileges of the GeoNetwork process. The issue is patched in GeoNetwork versions 4.4.12 and 4.2.17.

Affected products

• Geonetwork Core-Geonetwork: from 4.3.0, before 4.4.12 (fixed in 4.4.12); before 4.2.17 (fixed in 4.2.17)

Published 2026-09-03. Last modified 2026-09-09.