CVE-2026-58400 GeoNetwork vulnerable to Remote Code Execution via unsafe Saxon XSLT processor configuration in formatter
Privileged users can achieve remote code execution by uploading malicious XSLT stylesheets due to unsafe Saxon processor configuration.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-58400?
CVE-2026-58400 is a critical code injection vulnerability in core-geonetwork, published on 3 Sep 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
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.
Which versions are affected by CVE-2026-58400?
How do I fix CVE-2026-58400?
No fix has been published for CVE-2026-58400 yet. Limit exposure of the affected software until one is available.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2026-58400 being exploited?
There is no known exploitation of CVE-2026-58400 in the wild and no public exploit code.
Sources
Also known as GHSA-x898-729x-cc3r.