# CVE-2025-27818: Apache Kafka Deserialization of Untrusted Data vulnerability

Source: https://junglewise.ai/threats/cve-2025-27818-apache-kafka-deserialization-of-untrusted-data-vulnerability  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2025-06-10  
License: CC BY 4.0 with a link back

CVE-2025-27818 · Severity: low · CVSS 3.1 · Published 2025-06-10

Apache Kafka Deserialization of Untrusted Data vulnerability

Technologies: [org.apache.kafka:kafka_2.11 (Maven)](https://junglewise.ai/threats/technologies/org-apache-kafka-kafka-2-11), [org.apache.kafka:kafka_2.12 (Maven)](https://junglewise.ai/threats/technologies/org-apache-kafka-kafka-2-12), [org.apache.kafka:kafka_2.13 (Maven)](https://junglewise.ai/threats/technologies/org-apache-kafka-kafka-2-13). Vendors: [Maven](https://junglewise.ai/threats/vendors/maven).

## Quick answers

**Is CVE-2025-27818 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2025-27818 being exploited in the wild.

**How severe is CVE-2025-27818?** Low severity, with a CVSS score of 3.1, published 10 June 2025.

**Which products and versions are affected?** org.apache.kafka:kafka_2.11 (Maven) ECOSYSTEM:introduced=2.3.0,last_affected=2.4.1; org.apache.kafka:kafka_2.12 (Maven) ECOSYSTEM:introduced=2.3.0,fixed=3.9.1; org.apache.kafka:kafka_2.13 (Maven) ECOSYSTEM:introduced=2.4.0,fixed=3.9.1.

**Is there a fix for CVE-2025-27818?** Yes. org.apache.kafka:kafka_2.12 (Maven): upgrade to 3.9.1 or later; org.apache.kafka:kafka_2.13 (Maven): upgrade to 3.9.1 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**Am I affected by CVE-2025-27818?** Check whether you run org.apache.kafka:kafka_2.11 (Maven), org.apache.kafka:kafka_2.12 (Maven) or org.apache.kafka:kafka_2.13 (Maven) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- org.apache.kafka:kafka_2.12 (Maven): upgrade to 3.9.1 or later

  ```sh
  # set org.apache.kafka:kafka_2.12 to 3.9.1 in your pom.xml or build.gradle
  ```

- org.apache.kafka:kafka_2.13 (Maven): upgrade to 3.9.1 or later

  ```sh
  # set org.apache.kafka:kafka_2.13 to 3.9.1 in your pom.xml or build.gradle
  ```


## Affected products

- org.apache.kafka:kafka_2.11 (Maven) ECOSYSTEM:introduced=2.3.0,last_affected=2.4.1
- org.apache.kafka:kafka_2.12 (Maven) ECOSYSTEM:introduced=2.3.0,fixed=3.9.1
- org.apache.kafka:kafka_2.13 (Maven) ECOSYSTEM:introduced=2.4.0,fixed=3.9.1

## Identifiers

- CVE-2025-27818
- GHSA-76qp-h5mr-frr4

## Related threats

- [Apache Kafka Deserialization of Untrusted Data vulnerability](https://junglewise.ai/threats/cve-2025-27819-apache-kafka-deserialization-of-untrusted-data-vulnerability)
- [Apache Kafka's SCRAM implementation Incorrectly Implements Authentication Algorithm](https://junglewise.ai/threats/cve-2024-56128-apache-kafka-s-scram-implementation-incorrectly-implements)
- [Observable Discrepancy in Apache Kafka](https://junglewise.ai/threats/cve-2021-38153-observable-discrepancy-in-apache-kafka)