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Known exploited vulnerability

CVE-2026-34486

highCVSS 3.1 7.5In CISA KEVEPSS 99%Published · Apache Software Foundation

The short answer

CVE-2026-34486 affects Apache Software Foundation Apache Tomcat and is rated high (CVSS 7.5). CISA added it to the Known Exploited Vulnerabilities catalog on 2026-08-04: attackers are using it, so patch it first. Fixed versions are published for tomcat-tribes (11.0.21, 10.1.54, 9.0.117) and tomcat (11.0.21, 10.1.54, 9.0.117).

What it is

Missing Encryption of Sensitive Data vulnerability in Apache Tomcat due to the fix for CVE-2026-29146 allowing the bypass of the EncryptInterceptor. This issue affects Apache Tomcat: 11.0.20, 10.1.53, 9.0.116. Users are recommended to upgrade to version 11.0.21, 10.1.54 or 9.0.117, which fix the issue.

Weakness: CWE-311, CWE-807.

Severity

7.5 high

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Exploited (CISA KEV)

Yes, since Aug 4, 2026

Federal due date Aug 7, 2026

EPSS, next 30 days

99%

Higher than 100% of scored CVEs

How it can be exploited

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
None
Availability impact
None

What CISA says to do

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…

Affected packages and fixed versions

PackageEcosystemFixed inAdvisory
org.apache.tomcat:tomcat-tribesMaven11.0.21, 10.1.54, 9.0.117GHSA-69r9-qgr7-g2wj
org.apache.tomcat:tomcatMaven11.0.21, 10.1.54, 9.0.117GHSA-69r9-qgr7-g2wj

Is it in your code? Drop your lockfile into the free vulnerability check, or let vulnerability watch check your repository every day and open the upgrade as a pull request.

Affected products

Apache Tomcat, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10.0 Extended Update Support, Red Hat Enterprise Linux 7 Extended Lifecycle Support, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 8.8 Telecommunications Update Service, Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions, Red Hat Enterprise Linux 9, Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions, Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions, Red Hat Enterprise Linux 9.6 Extended Update Support, Red Hat JBoss Web Server 7.0.0. NVD's record lists the exact affected versions.

References

Questions

Is CVE-2026-34486 being exploited?

Yes. CISA added CVE-2026-34486 to its Known Exploited Vulnerabilities catalog on 2026-08-04, with a federal remediation due date of 2026-08-07.

How do I fix CVE-2026-34486?

Upgrade to a fixed version: org.apache.tomcat:tomcat-tribes (Maven) 11.0.21 or 10.1.54 or 9.0.117; org.apache.tomcat:tomcat (Maven) 11.0.21 or 10.1.54 or 9.0.117. CISA's required action: 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…

From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Analyzed. The description is NVD's text, quoted as published.

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