Deserialization of Untrusted Data in Apache Kafka - CVE-2025-27819

Vulnerability identifier: #VU114434

CSH Severity: High

CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2025-27819

CWE-ID: CWE-502

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to perform a denial of service attack.

The vulnerability exists due to insecure input validation when processing serialized data. A remote attacker can pass specially crafted data to the application and perform a denial of service attack.

Apache Kafka
IBM Operator for Apache Flink
Log Analysis
Operations Analytics - Log Analysis
Integration Bus for z/OS
InfoSphere Data Replication
IBM App Connect Enterprise
AMQ Streams

Install updates from vendor's website.

Apache Kafka - update to 3.4.0
IBM Operator for Apache Flink - update to 1.4.5
Log Analysis - update to 1.3.8.1
Operations Analytics - Log Analysis - update to 1.3.8.3 IF1
Integration Bus for z/OS - update to 10.1.0.6
IBM App Connect Enterprise - addressed in versions 12.0.12.16, 13.0.4.1
AMQ Streams - update to 3.1.0

• https://kafka.apache.org/cve-list

• Deserialization of untrusted data in Apache Kafka
• Multiple vulnerabilities in IBM App Connect Enterprise and IBM Integration Bus for z/OS
• Multiple vulnerabilities in IBM Log Analysis
• Red Hat AMQ Streams update for Apache Kafka
• Multiple vulnerabilities in IBM Operations Analytics - Log Analysis
• Multiple vulnerabilities in IBM InfoSphere Data Replication
• Multiple vulnerabilities in IBM Operator for Apache Flink