CVE WatchOct 8, 2026

CVE-2019-12086

A Polymorphic Typing issue was discovered in FasterXML jackson-databind 2.x before 2.9.9. When Default Typing is enabled (either globally or

CVSS

7.5

High

EPSS

21.9%

p98

KEV

—

Exploit Today

0-100

Published: May 17, 2019 · Last modified: Oct 8, 2026 · CWE-502

EPSS · 30d

21.9%EPSS · 30 days21.9%

2026-09-252026-10-23

Technical description

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.

Official references

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