CVE-2026-34197

Apache ActiveMQ exploited vulnerability, confirmed exploited in the wild.

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

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98%chance of exploitation in the next 30 days (EPSS), 99th percentile

16 Apradded to CISA's Known Exploited Vulnerabilities list, 2026

30 Aprfederal remediation deadline, already passed

Passedpast the deadline: patch now

CISA's name for it	Apache ActiveMQ Improper Input Validation Vulnerability
Vendor and product	Apache · ActiveMQ
Type	exploited vulnerability · CWE-20, CWE-94
Exploited	Confirmed by CISA listed 16 April 2026
Likelihood	one of the most likely to be exploited of every vulnerability tracked
Deadline	30 April 2026 · already passed
Used in ransomware	Not reported
Advisories	activemq.apache.org ↗ · nvd.nist.gov ↗

What to do

Three steps, in this order

Step 1

Apply the vendor's fix or mitigation; CISA lists only vulnerabilities seen exploited.

Step 2

If you cannot patch now, restrict network access to the affected product.

Step 3

Check for signs of compromise since the date it was added to the list.

CISA's 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.

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Questions

CVE-2026-34197 in short

Is CVE-2026-34197 being exploited?

Yes. CISA added CVE-2026-34197 to its Known Exploited Vulnerabilities catalogue on 16 April 2026, which it does only on evidence of exploitation in the wild.

What is the CISA deadline for CVE-2026-34197?

US federal agencies must remediate it by 30 April 2026. Everyone else should treat that date as the latest safe point to patch an internet-facing system.

How likely is CVE-2026-34197 to be exploited in the next 30 days?

FIRST's Exploit Prediction Scoring System gives it 98%, the 99th percentile of every CVE it scores.

How do I fix CVE-2026-34197?

Apply the vendor's fix or mitigation; CISA lists only vulnerabilities seen exploited. If you cannot patch now, restrict network access to the affected product. Check for signs of compromise since the date it was added to the list.

Same vendor

Other Apache vulnerabilities being exploited

CVE	Product	Type	Listed
CVE-2016-3081	Struts	remote code execution	8 October 2026
CVE-2026-34486	Tomcat	exploited vulnerability	4 August 2026

Sources: CISA Known Exploited Vulnerabilities catalogue (released 10 November 2026) and FIRST EPSS. Page compiled automatically by SAK T.L.M, the threat-intelligence tool of SAK T.E.C, on 13 November 2026.