CVE-2019-12086: Debian Linux

High severity, CVSS 7.5. EPSS: 21.9% chance of exploitation in the next 30 days.

A Polymorphic Typing issue was discovered in FasterXML jackson-databind 2.x before 2.9.9. When Default Typing is enabled (either globally or for a specific property) for an externally exposed JSON endpoint, the service has the mysql-connector-java jar (8.0.14 or earlier) in the classpath, and an attacker can host a crafted MySQL server reachable by the victim, an attacker can send a crafted JSON message that allows them to read arbitrary local files on the server. This occurs because of missing com.mysql.cj.jdbc.admin.MiniAdmin validation.

Affected products

• Debian Debian Linux: version 8.0 only; version 9.0 only
• Fasterxml Jackson-Databind: from 2.0.0, before 2.6.7.3 (fixed in 2.6.7.3); from 2.7.0, before 2.7.9.6 (fixed in 2.7.9.6); from 2.8.0, before 2.8.11.4 (fixed in 2.8.11.4); from 2.9.0, before 2.9.9 (fixed in 2.9.9)

Published 2019-05-17. Last modified 2026-10-08.