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Actively exploited · Published Apr 9, 2026 · Assigned by apache

CVE-2026-34486Apache Tomcat: Fix for CVE-2026-29146 allowed bypass of EncryptInterceptor

High 7.5 Exploited

In plain English

A high-severity security flaw in Apache Tomcat from Apache Software Foundation. Attackers are actively exploiting it in the wild (listed by CISA on August 4, 2026). The chance it is exploited in the next 30 days is estimated at 98.5% (higher than 99.9% of all known vulnerabilities). Ready-made attack tooling exists: Nuclei, public proof-of-concept code. Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.5High
Exploit odds (30 days)98.5%top 0.1% of all CVEs
Exploited in the wildYesCISA KEV since Aug 4, 2026
Attack tooling2Nuclei, Public PoC

CISA guidance

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.

Federal agencies must remediate by Aug 7, 2026.

Official description

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
AlmaLinux:10tomcat1:10.1.49-3.el10_2.alma.1ALSA-2026:36788
AlmaLinux:8tomcat1:9.0.87-2.el8_10ALSA-2026:37137
AlmaLinux:9tomcat1:9.0.117-2.el9_8ALSA-2026:36879
AlmaLinux:10tomcat-admin-webapps1:10.1.49-3.el10_2.alma.1ALSA-2026:36788
AlmaLinux:8tomcat-admin-webapps1:9.0.87-2.el8_10ALSA-2026:37137
AlmaLinux:9tomcat-admin-webapps1:9.0.117-2.el9_8ALSA-2026:36879
AlmaLinux:10tomcat-docs-webapp1:10.1.49-3.el10_2.alma.1ALSA-2026:36788
AlmaLinux:8tomcat-docs-webapp1:9.0.87-2.el8_10ALSA-2026:37137
AlmaLinux:9tomcat-docs-webapp1:9.0.117-2.el9_8ALSA-2026:36879
AlmaLinux:8tomcat-el-3.0-api1:9.0.87-2.el8_10ALSA-2026:37137
AlmaLinux:9tomcat-el-3.0-api1:9.0.117-2.el9_8ALSA-2026:36879
AlmaLinux:10tomcat-el-5.0-api1:10.1.49-3.el10_2.alma.1ALSA-2026:36788
AlmaLinux:8tomcat-jsp-2.3-api1:9.0.87-2.el8_10ALSA-2026:37137
AlmaLinux:9tomcat-jsp-2.3-api1:9.0.117-2.el9_8ALSA-2026:36879
AlmaLinux:10tomcat-jsp-3.1-api1:10.1.49-3.el10_2.alma.1ALSA-2026:36788
AlmaLinux:10tomcat-lib1:10.1.49-3.el10_2.alma.1ALSA-2026:36788
AlmaLinux:8tomcat-lib1:9.0.87-2.el8_10ALSA-2026:37137
AlmaLinux:9tomcat-lib1:9.0.117-2.el9_8ALSA-2026:36879
AlmaLinux:8tomcat-servlet-4.0-api1:9.0.87-2.el8_10ALSA-2026:37137
AlmaLinux:9tomcat-servlet-4.0-api1:9.0.117-2.el9_8ALSA-2026:36879
AlmaLinux:10tomcat-servlet-6.0-api1:10.1.49-3.el10_2.alma.1ALSA-2026:36788
AlmaLinux:10tomcat-webapps1:10.1.49-3.el10_2.alma.1ALSA-2026:36788
AlmaLinux:8tomcat-webapps1:9.0.87-2.el8_10ALSA-2026:37137
AlmaLinux:9tomcat-webapps1:9.0.117-2.el9_8ALSA-2026:36879
AlmaLinux:10tomcat91:9.0.117-2.el10_2.alma.1ALSA-2026:36790
AlmaLinux:10tomcat9-admin-webapps1:9.0.117-2.el10_2.alma.1ALSA-2026:36790
AlmaLinux:10tomcat9-docs-webapp1:9.0.117-2.el10_2.alma.1ALSA-2026:36790
AlmaLinux:10tomcat9-el-3.0-api1:9.0.117-2.el10_2.alma.1ALSA-2026:36790
AlmaLinux:10tomcat9-jsp-2.3-api1:9.0.117-2.el10_2.alma.1ALSA-2026:36790
AlmaLinux:10tomcat9-lib1:9.0.117-2.el10_2.alma.1ALSA-2026:36790
AlmaLinux:10tomcat9-servlet-4.0-api1:9.0.117-2.el10_2.alma.1ALSA-2026:36790
AlmaLinux:10tomcat9-webapps1:9.0.117-2.el10_2.alma.1ALSA-2026:36790
Mavenorg.apache.tomcat:tomcat11.0.21GHSA-69r9-qgr7-g2wj
Mavenorg.apache.tomcat:tomcat9.0.117GHSA-69r9-qgr7-g2wj
Mavenorg.apache.tomcat:tomcat10.1.54GHSA-69r9-qgr7-g2wj
Mavenorg.apache.tomcat:tomcat-tribes10.1.54GHSA-69r9-qgr7-g2wj
Mavenorg.apache.tomcat:tomcat-tribes11.0.21GHSA-69r9-qgr7-g2wj
Mavenorg.apache.tomcat:tomcat-tribes9.0.117GHSA-69r9-qgr7-g2wj
Rocky Linux:10tomcat1:10.1.49-3.el10_2RLSA-2026:36788
Rocky Linux:8tomcat1:9.0.87-2.el8_10RLSA-2026:37137
Rocky Linux:9tomcat1:9.0.117-2.el9_8RLSA-2026:36879
Rocky Linux:10tomcat91:9.0.117-2.el10_2RLSA-2026:36790

Affected products (as reported)

VendorProductVersions
Apache Software Foundation Apache Tomcat 11.0.2010.1.539.0.116

Weakness: CWE-311, CWE-807 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

References