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CVE-2026-58400 is an arbitrary operating-system command-execution vulnerability in GeoNetwork formatter rendering. In versions before 4.4.12 and 4.2.17, the Saxon XSLT processor is configured without secure processing enabled and with Java extension functions available. Consequently, an attacker-controlled formatter stylesheet can invoke Java runtime process-execution APIs, causing commands to run under the GeoNetwork process account.
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No public exploit code observed for this vulnerability.
7 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An arbitrary OS command-execution vulnerability in GeoNetwork's formatter XSLT processing. A sufficiently privileged user able to upload a formatter can supply a malicious .xsl stylesheet that invokes Java extension functions such as Runtime.exec() or ProcessBuilder, executing commands as the GeoNetwork process user.
An unsafe Saxon XSLT processor configuration in GeoNetwork that permits loaded stylesheets to invoke Java process-execution functionality, enabling operating-system command execution. It requires formatter-upload privileges alone, but becomes unauthenticated RCE when chained with CVE-2026-63219.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.