CVE-2026-34486: Apache Tomcat encryption bypass in EncryptInterceptor

CVE-2026-34486 · Severity: critical · CVSS 7.5 · Exploited in the wild · Published 2026-04-09

Apache Tomcat, a widely used web server for Java applications, contains a security flaw that fails to properly encrypt sensitive data during internal communication. This vulnerability could allow an attacker to bypass security controls intended to protect data in transit, potentially leading to the exposure of confidential information. Organizations should upgrade to the latest patched versions to ensure their data remains encrypted and secure.

Technologies: Apache Tomcat, org.apache.tomcat:tomcat (Maven), org.apache.tomcat:tomcat-tribes (Maven). Vendors: Apache, Apache Software Foundation, Maven.

Quick answers

Is CVE-2026-34486 exploited in the wild?
Yes. CVE-2026-34486 is known to be exploited in the wild, first recorded on 4 August 2026. Treat it as urgent.
How severe is CVE-2026-34486?
Critical severity, with a CVSS score of 7.5, published 9 April 2026.
Which products and versions are affected?
Apache Tomcat 11.0.20, 10.1.53, 9.0.116; Apache Software Foundation Tomcat Tribes 11.0.20, 10.1.53, 9.0.116; org.apache.tomcat:tomcat (Maven) ECOSYSTEM:introduced=11.0.20,fixed=11.0.21; org.apache.tomcat:tomcat-tribes (Maven) ECOSYSTEM:introduced=11.0.20,fixed=11.0.21.
Is there a fix for CVE-2026-34486?
Yes. org.apache.tomcat:tomcat (Maven): upgrade to 11.0.21 or later; org.apache.tomcat:tomcat-tribes (Maven): upgrade to 11.0.21 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-34486 attacked?
It is attacked over the network, in a software library.
Am I affected by CVE-2026-34486?
Check whether you run Apache Tomcat, Apache Software Foundation Tomcat Tribes, org.apache.tomcat:tomcat (Maven) or one of the others listed at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • org.apache.tomcat:tomcat (Maven): upgrade to 11.0.21 or later
    # set org.apache.tomcat:tomcat to 11.0.21 in your pom.xml or build.gradle
  • org.apache.tomcat:tomcat-tribes (Maven): upgrade to 11.0.21 or later
    # set org.apache.tomcat:tomcat-tribes to 11.0.21 in your pom.xml or build.gradle

Technical details

A vulnerability in Apache Tomcat (CWE-311) arises from an incomplete fix for a previous issue (CVE-2026-29146), which allows an attacker to bypass the EncryptInterceptor. The EncryptInterceptor is responsible for encrypting sensitive data within a Tomcat cluster; its bypass means that sensitive information may be transmitted in plaintext or otherwise accessed without authorization. The vulnerability is reachable over the network without authentication. Affected versions include 11.0.20, 10.1.53, and 9.0.116. Users are advised to upgrade to 11.0.21, 10.1.54, or 9.0.117.

Affected products

  • Apache Tomcat 11.0.20, 10.1.53, 9.0.116

Identifiers

  • CVE-2026-34486
  • GHSA-69r9-qgr7-g2wj

Timeline

  • 2026-08-04: advisory: Initial NVD publication date
  • 2026-08-04: exploited: Reported as exploited in the wild in the advisory summary

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