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CVE-2025-27511 geoserver CVE debrief

CVE-2025-27511 is a high-severity vulnerability in GeoServer's DB2 DataStore Extension. An administrator can perform a JNDI attack through a specially crafted DB2 jdbc URL, leading to Remote Code Execution (RCE). The issue was fixed in version 2.27.0 of the extension. Organizations using affected versions should upgrade immediately. This vulnerability has a CVSS score of 7.2 and is considered HIGH severity. The CVE was published on June 18, 2026, and last modified on the same day.

Vendor
geoserver
Product
org.geoserver.extension:gs-db2
CVSS
HIGH 7.2
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-18
Original CVE updated
2026-06-22
Advisory published
2026-06-18
Advisory updated
2026-06-22

Who should care

Administrators and users of GeoServer's DB2 DataStore Extension, especially those using versions prior to 2.27.0, should be aware of this vulnerability and take immediate action to upgrade to the patched version.

Technical summary

The vulnerability exists in the GeoServer DB2 DataStore Extension, specifically in versions prior to 2.27.0. An attacker can exploit this vulnerability by crafting a malicious DB2 jdbc URL, which can be used to perform a JNDI attack, ultimately leading to Remote Code Execution (RCE). The CVSS vector for this vulnerability is CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H, indicating a high severity level.

Defensive priority

High

Recommended defensive actions

  • Upgrade to version 2.27.0 of the GeoServer DB2 DataStore Extension
  • Restrict access to the DB2 DataStore Extension to only necessary personnel
  • Monitor for suspicious activity and crafted DB2 jdbc URLs
  • Implement additional security measures, such as input validation and sanitization
  • Regularly review and update GeoServer and its extensions
  • Consider implementing a Web Application Firewall (WAF) to detect and prevent attacks

Evidence notes

The information provided is based on the CVE record and NVD details. The CVE was published on June 18, 2026, and last modified on the same day. The vulnerability is considered HIGH severity with a CVSS score of 7.2.

Official resources

CVE-2025-27511 was published on June 18, 2026.