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CVE-2026-34486 CISA KEV — actively exploited

Apache Tomcat Missing Encryption of Sensitive Data Vulnerability

Apache Software Foundation — Apache Tomcat

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 scoreHigh

7.5

EPSS — exploitation probabilityHigh

82.9%

Vector breakdown

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

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

Published
Apr 9, 2026
Modified
Aug 10, 2026
Added to KEV
Aug 4, 2026
Federal patch due
Aug 7, 2026

CISA 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 evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

Weakness classification

CWE-311Missing Encryption of Sensitive DataCWE-807Reliance on Untrusted Inputs in a Security Decision

Affected packages

org.apache.tomcat:tomcatmaven
GHSA-69r9-qgr7-g2wj

Proof-of-concept & exploitation references

7 found

Weaponization

Nuclei template

Available

Metasploit module

Not found

Public repositories whose name or description references CVE-2026-34486, found via a live GitHub search at request time. These are community-sourced signals, not a verified working exploit - cross-check each one before relying on it, and treat higher star counts and recent activity as (weak) corroboration, not proof.

  • striga-ai/CVE-2026-34486★ 70

    EncryptInterceptor fail-open bypass in Apache Tomcat Tribes clustering leading to unauthenticated RCE via Java deserialization.

    updated Aug 16, 2026

  • AirSkye/CVE-2026-34486-poc★ 12

    CVE-2026-34486 Apache Tomcat EncryptInterceptor 绕过漏洞复现（使用GLM5.1复现完成）

    updated Aug 5, 2026

  • 404-src/CVE-2026-34486★ 9

    Apache Tomcat EncryptInterceptor Bypass → Unauthenticated RCE (CVE-2026-34486)

    updated Aug 7, 2026

  • punitdarji/tomcat-cve-2026-34486★ 1

    CVE labs

    updated Apr 29, 2026

  • razureink/cve-2026-34486-tomcat_encrypt_bypass_reproduction★ 0

    CVE Reproduction: cve-2026-34486-tomcat_encrypt_bypass_reproduction

    updated Jul 23, 2026

  • anonmrc/CVE-2026-34486-e-Tomcat-Tribes★ 0

    updated May 19, 2026

  • CypherHippie/CVE-2026-34486---unauthenticated-RCE-via-Java-deserialization★ 0

    EncryptInterceptor fail-open bypass in Apache Tomcat Tribes clustering leading to unauthenticated RCE via Java deserialization.

    updated Aug 19, 2026

References

  • lists.apache.org
  • vicarius.io
  • vicarius.io
  • access.redhat.com
  • access.redhat.com
  • access.redhat.com
  • access.redhat.com
  • access.redhat.com
  • access.redhat.com
  • access.redhat.com
  • access.redhat.com
  • access.redhat.com
  • access.redhat.com
  • access.redhat.com
  • access.redhat.com
  • access.redhat.com
  • access.redhat.com
  • bugzilla.redhat.com
  • security.access.redhat.com
  • socradar.io

Frequently asked questions

What is CVE-2026-34486?

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.

How severe is CVE-2026-34486?

CVE-2026-34486 has a CVSS base score of 7.5 out of 10 (CVSS 3.1).

Is CVE-2026-34486 actively exploited in the wild?

Yes. CVE-2026-34486 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added Aug 4, 2026, meaning CISA has confirmed evidence of active exploitation.

What is the EPSS score for CVE-2026-34486?

82.9% - meaning FIRST.org's EPSS model estimates a 82.9% probability this vulnerability will be exploited in the wild within 30 days (100% percentile among all scored CVEs).

Is there exploit tooling available for CVE-2026-34486?

Yes - a public Nuclei template referencing CVE-2026-34486 exist in public repositories we checked. We also found 7 public GitHub repositories referencing this CVE.

What type of vulnerability is CVE-2026-34486?

CVE-2026-34486 is classified under CWE-311, CWE-807 (CWE-311 Missing Encryption of Sensitive Data).

Cross-checked against

  • NVD (NIST)
  • MITRE CVE Record
  • CISA KEV
  • FIRST.org EPSS
  • GitHub Advisory Database
  • GitHub public repository search

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