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

criticalknown exploitedpublic exploitCVE-2026-34197
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
Apache ActiveMQ contains an improper input validation vulnerability that allows for code injection.

CSIRTS triage

vendor: Apacheproduct: ActiveMQCode injection
What
Apache ActiveMQ contains an improper input validation vulnerability that allows for code injection.
Who is affected
Deployments of Apache ActiveMQ.
Urgency
Remediation is urgent due to active exploitation and critical severity.
Action
Apply the latest security patch for Apache ActiveMQ.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2026-04-16
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-34197

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-34197coverage & exploitation statusNVD · CVE.org

Recent advisories for Apache ActiveMQ Improper

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

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