Is CVE-2026-58400 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-58400 being exploited in the wild.

How severe is CVE-2026-58400?

Critical severity, with a CVSS score of 9.1, published 3 September 2026.

Which products and versions are affected?

GeoNetwork GeoNetwork 4.4.0–4.4.11, 4.2.0–4.2.16.

Is there a fix for CVE-2026-58400?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2026-58400 attacked?

It is attacked over the network, in a web application.

Am I affected by CVE-2026-58400?

Check whether anything you run is named in the advisory. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-58400: GeoNetwork remote code execution via unsafe Saxon XSLT processor

CVE-2026-58400 · Severity: critical · CVSS 9.1 · Published 2026-09-03

GeoNetwork is a web-based catalog application that manages geographic and spatial data resources. The Saxon XSLT processor, which GeoNetwork uses to render formatters for display purposes, is misconfigured and allows users with formatter-upload privileges to execute arbitrary system commands with the full privileges of the GeoNetwork application. This could allow an attacker to compromise the server, steal data, or disrupt operations.

Quick answers

Is CVE-2026-58400 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-58400 being exploited in the wild.
How severe is CVE-2026-58400?: Critical severity, with a CVSS score of 9.1, published 3 September 2026.
Which products and versions are affected?: GeoNetwork GeoNetwork 4.4.0–4.4.11, 4.2.0–4.2.16.
Is there a fix for CVE-2026-58400?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-58400 attacked?: It is attacked over the network, in a web application.
Am I affected by CVE-2026-58400?: Check whether anything you run is named in the advisory. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

The vulnerability stems from unsafe configuration of the Saxon XSLT processor: secure processing (FEATURE_SECURE_PROCESSING) is disabled and Java extension functions (ALLOW_EXTERNAL_FUNCTIONS) are not restricted. This allows any XSLT stylesheet loaded by GeoNetwork to invoke java.lang.Runtime.exec() or java.lang.ProcessBuilder directly. An attacker with sufficient privileges to upload a formatter can craft a malicious .xsl file containing Java extension calls that execute arbitrary OS commands. The attack requires formatter-upload privileges but has no network restriction—the payload is processed server-side during stylesheet rendering. Patches are available in GeoNetwork 4.4.12 and 4.2.17.

Affected products

GeoNetwork GeoNetwork 4.4.0–4.4.11, 4.2.0–4.2.16

Timeline

2026-09-03: disclosed

References

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