---
title: "CVE-2026-34197: Apache ActiveMQ Improper Input Validation Vulnerability"
url: https://erroneo.us/security/cve/CVE-2026-34197/
description: "CVE-2026-34197 (Apache ActiveMQ): Exploited in the wild (CISA KEV). Improper Input Validation, Improper Control of Generation of Code ('Code Injection')…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-04-07
date_modified: 2026-08-17
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-34197"
kev: true
cvss: 8.8
epss: 0.15492
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-34197: Apache ActiveMQ Improper Input Validation Vulnerability

**Signal:** Exploited: patch now if you run it. CISA has confirmed exploitation in the wild. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Yes, if you run Apache ActiveMQ. CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2026-04-16, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2026-04-30 ; treat that as the outer limit, not the target.
- EPSS 15.5% , percentile 97: FIRST’s model estimates a 15.5% chance of exploitation activity in the next 30 days, higher than 97% of all scored CVEs (very high). EPSS is a probability, not a verdict.
- Needs an account (low (any account)). Exposure depends on who can log in.

## What it is

Improper Input Validation, Improper Control of Generation of Code ('Code Injection') vulnerability in Apache ActiveMQ Broker, Apache ActiveMQ. Apache ActiveMQ Classic exposes the Jolokia JMX-HTTP bridge at /api/jolokia/ on the web console. The default Jolokia access policy permits exec operations on all ActiveMQ MBeans (org.apache.activemq:), including BrokerService.addNetworkConnector(String) and BrokerService.addConnector(String). An authenticated attacker can invoke these operations with a crafted discovery URI that triggers the VM transport's brokerConfig parameter to load a remote Spring XML application context using ResourceXmlApplicationContext. Because Spring's ResourceXmlApplicationContext instantiates all singleton beans before the BrokerService validates the configuration, arbitrary code execution occurs on the broker's JVM through bean factory methods such as Runtime.exec(). This issue affects Apache ActiveMQ Broker: before 5.19.4, from 6.0.0 before 6.2.3; Apache ActiveMQ All: before 5.19.4, from 6.0.0 before 6.2.3; Apache ActiveMQ: before 5.19.4, from 6.0.0 before 6.2.3. Users are recommended to upgrade to version 5.19.4 or 6.2.3, which fixes the issue

## Affected products (CVE record)

- Apache Software Foundation Apache ActiveMQ Broker: < 5.19.4, 6.0.0 < 6.2.3
- Apache Software Foundation Apache ActiveMQ All: < 5.19.4, 6.0.0 < 6.2.3
- Apache Software Foundation Apache ActiveMQ: < 5.19.4, 6.0.0 < 6.2.3

## Severity

- CISA-ADP CVSS 3.1: 8.8 `CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`
- redhat-SADP CVSS 3.1: 8.8 `CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`

## Exploitation

- CISA KEV: added 2026-04-16; federal due date 2026-04-30. Known ransomware use: Unknown.
- CISA required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
- CISA SSVC assessment: exploitation active , automatable no , technical impact total .
- FIRST EPSS (model of 2026-10-21): 15.49% probability of exploitation activity in the next 30 days; percentile 97.

## Sources

- [activemq.apache.org](https://activemq.apache.org/security-advisories.data/CVE-2026-34197-announcement.txt)
- [CVE.org record CVE-2026-34197](https://www.cve.org/CVERecord?id=CVE-2026-34197)
- [NVD entry CVE-2026-34197](https://nvd.nist.gov/vuln/detail/CVE-2026-34197)
- [CISA Known Exploited Vulnerabilities catalog entry](https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-34197)
- [openwall.com](http://www.openwall.com/lists/oss-security/2026/04/06/3)
- [access.redhat.com](https://access.redhat.com/security/cve/CVE-2026-34197)
- [RHBZ#2455869](https://bugzilla.redhat.com/show_bug.cgi?id=2455869)
- [security.access.redhat.com](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-34197.json)

---
Source page: https://erroneo.us/security/cve/CVE-2026-34197/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt