CVE-2024-27135: Apache Pulsar

Critical severity, CVSS 9.9. EPSS: 6% chance of exploitation in the next 30 days.

Improper input validation in the Pulsar Function Worker allows a malicious authenticated user to execute arbitrary Java code on the Pulsar Function worker, outside of the sandboxes designated for running user-provided functions. This vulnerability also applies to the Pulsar Broker when it is configured with "functionsWorkerEnabled=true". This issue affects Apache Pulsar versions from 2.4.0 to 2.10.5, from 2.11.0 to 2.11.3, from 3.0.0 to 3.0.2, from 3.1.0 to 3.1.2, and 3.2.0. 2.10 Pulsar Function Worker users should upgrade to at least 2.10.6. 2.11 Pulsar Function Worker users should upgrade to at least 2.11.4. 3.0 Pulsar Function Worker users should upgrade to at least 3.0.3. 3.1 Pulsar Function Worker users should upgrade to at least 3.1.3. 3.2 Pulsar Function Worker users should upgrade to at least 3.2.1. Users operating versions prior to those listed above should upgrade to the aforementioned patched versions or newer versions.

Affected products

• Apache Pulsar: from 2.4.0, before 2.10.6 (fixed in 2.10.6); from 2.11.0, before 2.11.4 (fixed in 2.11.4); from 3.0.0, before 3.0.3 (fixed in 3.0.3); from 3.1.0, before 3.1.3 (fixed in 3.1.3); version 3.2.0 only

Published 2024-03-12. Last modified 2026-06-17.