CVE-2026-34486
Apache Tomcat Missing Encryption of Sensitive Data Vulnerability
Does this matter?
Known to be exploited in the wild (CISA KEV, CISA remediation deadline 7 August 2026). Treat as an emergency change: patch or isolate now, then hunt for prior compromise.
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.
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- EPSS
- 98.62% probability · 100th percentile
- CISA KEV
- Listed 4 August 2026 · due 7 August 2026
- Weakness
- CWE-311, CWE-807
- Affected
- apache/tomcat · redhat/jboss web server · redhat/enterprise linux · redhat/enterprise linux els · redhat/enterprise linux eus · redhat/enterprise linux tus · redhat/enterprise linux update services for sap solutions
- Source
- security@apache.org
CISA notes
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. https://lists.apache.org/thread/9510k5p5zdvt9pkkgtyp85mvwxo2qrly ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-34486
References
- https://lists.apache.org/thread/9510k5p5zdvt9pkkgtyp85mvwxo2qrlyMailing List, Vendor Advisory
- https://www.vicarius.io/vsociety/posts/cve-2026-34486-detection-script-rce-on-apache-tomcatThird Party Advisory
- https://www.vicarius.io/vsociety/posts/cve-2026-34486-mitigation-script-rce-on-apache-tomcatMitigation, Third Party Advisory
- https://access.redhat.com/errata/RHSA-2026:36787Third Party Advisory
- https://access.redhat.com/errata/RHSA-2026:36788Third Party Advisory
- https://access.redhat.com/errata/RHSA-2026:36789Third Party Advisory
- https://access.redhat.com/errata/RHSA-2026:36790Third Party Advisory
- https://access.redhat.com/errata/RHSA-2026:36876Third Party Advisory
- https://access.redhat.com/errata/RHSA-2026:36877Third Party Advisory
- https://access.redhat.com/errata/RHSA-2026:36878Third Party Advisory
- https://access.redhat.com/errata/RHSA-2026:36879Third Party Advisory
- https://access.redhat.com/errata/RHSA-2026:37136Third Party Advisory
- https://access.redhat.com/errata/RHSA-2026:37137Third Party Advisory
- https://access.redhat.com/errata/RHSA-2026:38505Third Party Advisory
- https://access.redhat.com/errata/RHSA-2026:39188Third Party Advisory
- https://access.redhat.com/errata/RHSA-2026:39189Third Party Advisory
- https://access.redhat.com/security/cve/CVE-2026-34486Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2457027Issue Tracking, Third Party Advisory
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-34486.jsonThird Party Advisory
- https://socradar.io/blog/snowlight-government-chinese-campaign/Third Party Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-34486US Government Resource
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.