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Exploited vulnerability · CISA KEV

Is CVE-2026-34197 exploited? Yes: in CISA KEV since 16 Apr 2026

Gociux · Apache ActiveMQ · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2026-34197, Apache ActiveMQ Improper Input Validation Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 16 Apr 2026, 9 days after it was published. It affects Apache ActiveMQ. If you run it, CISA's required action is: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

exploitedYesCISA KEV · 16 Apr 2026
ransomwareNot knownno confirmed use
EPSStop 1%among the most likely CVEs to be exploited
severity8.8CVSS 3.1 · high
US federal due30 Apr 2026BOD 22-01 deadline

What it is

Apache ActiveMQ contains an improper input validation vulnerability that allows for code injection.

VendorApache (41 exploited CVEs in KEV)
ProductActiveMQ
VulnerabilityApache ActiveMQ Improper Input Validation Vulnerability
WeaknessCWE-20, CWE-94
Published7 Apr 2026
Added to KEV16 Apr 2026
Reported by (CNA)apache

What to do

  1. Check whether you run it. Look for ActiveMQ in your asset inventory, including appliances and cloud images. Stack check lists every exploited Apache CVE at once.
  2. Apply the fix. Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
  3. If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 7 Apr 2026.
  4. Get told next time. Email alerts when CISA adds a CVE for Apache.

Other exploited CVEs in ActiveMQ

References

Questions

Is CVE-2026-34197 being exploited?

Yes. CISA added CVE-2026-34197 to the Known Exploited Vulnerabilities catalog on 16 Apr 2026, which means there is reliable evidence of exploitation in the wild.

Is CVE-2026-34197 used in ransomware attacks?

CISA does not list known ransomware use for it. That can change, and exploitation alone is reason to fix it first.

How do I fix CVE-2026-34197?

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. Check Apache's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected ActiveMQ and watch it for signs of compromise.

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in April 2026 · Apache scorecard · act-now radar.

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