A Polymorphic Typing issue was discovered in FasterXML jackson-databind 2.x before 2.9.9.

Summary

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.

Timeline

1. May 17, 2019, 4:57 PM UTCCVE published
2. Oct 8, 2026, 8:57 PM UTCCISA SSVC assessment

   Exploitation: none · Automatable: yes · Technical impact: partial

3. Oct 8, 2026, 9:03 PM UTCRecord last updated
4. Oct 22, 2026EPSS reached 10%

   FIRST estimates at least a 10% chance of exploitation in the next 30 days

Affected versions

• com.fasterxml.jackson.core:jackson-databindMaven

  From 2.9.0 · fixed in 2.9.9

• com.fasterxml.jackson.core:jackson-databindMaven

  From 2.8.0 · fixed in 2.8.11.4

• com.fasterxml.jackson.core:jackson-databindMaven

  From 2.7.0 · fixed in 2.7.9.6

• com.fasterxml.jackson.core:jackson-databindMaven

  From 2.0.0 · fixed in 2.6.7.3

References 25