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Exploited vulnerability · CISA KEV

Is CVE-2026-34486 exploited? Yes: in CISA KEV since 4 Aug 2026

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

Yes. CVE-2026-34486, Apache Tomcat Missing Encryption of Sensitive Data Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 4 Aug 2026, 117 days after it was published. It affects Apache Tomcat. If you run it, CISA's required action is: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

exploitedYesCISA KEV · 4 Aug 2026
ransomwareNot knownno confirmed use
EPSStop 1%among the most likely CVEs to be exploited
severity7.5CVSS 3.1 · high
US federal due7 Aug 2026BOD 22-01 deadline

What it is

Apache Tomcat contains a missing encryption of sensitive data vulnerability that allows the bypass of the EncryptInterceptor. This vulnerability can be chained with CVE‑2025‑24813.

VendorApache (41 exploited CVEs in KEV)
ProductTomcat
VulnerabilityApache Tomcat Missing Encryption of Sensitive Data Vulnerability
WeaknessCWE-311
Published9 Apr 2026
Added to KEV4 Aug 2026
Reported by (CNA)apache

What to do

  1. Check whether you run it. Look for Tomcat in your asset inventory, including appliances and cloud images. Stack check lists every exploited Apache CVE at once.
  2. Apply the fix. Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
  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 9 Apr 2026.
  4. Get told next time. Email alerts when CISA adds a CVE for Apache.

Other exploited CVEs in Tomcat

References

Questions

Is CVE-2026-34486 being exploited?

Yes. CISA added CVE-2026-34486 to the Known Exploited Vulnerabilities catalog on 4 Aug 2026, which means there is reliable evidence of exploitation in the wild.

Is CVE-2026-34486 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-2026-34486?

Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines. Check Apache's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected Tomcat 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 August 2026 · Apache scorecard · act-now radar.

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