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CISA KEV · ACTIVELY EXPLOITED
HIGH severity

CVE-2026-34486 — tomcat-tribes

HIGH

CVE-2026-34486 is a high-severity (CVSS 7.5) CWE-311 vulnerability in org.apache.tomcat:tomcat-tribes. It is in CISA's Known Exploited Vulnerabilities catalog (added 2026-08-04) — treat it as actively exploited and patch now. A fix is available for org.apache.tomcat:tomcat-tribes — see the affected versions and patch details below.

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

Also known asBIT-tomcat-2026-34486GHSA-69r9-qgr7-g2wj
Published
Apr 9, 2026
Updated
Sep 22, 2026
Affected
6 pkgs
Patched
6 / 6
Exploits
3 known
Exploitation data as of Sep 20, 2026 · OSV.dev, NVD, CISA KEV, FIRST.org (EPSS)

Exploitation Status

Actively exploited in the wild

  • Confirmed by CISA's Known Exploited Vulnerabilities catalog on 2026-08-04. Federal agencies were required to remediate by 2026-08-07.
  • CISA assesses this as automatable — exploitation doesn’t require manual, per-target effort, which raises the odds of mass scanning and opportunistic attacks.

Exploitation and automatability from CISA (KEV catalog and SSVC triage) for CVE-2026-34486.

EPSS Exploitation Probability

via FIRST.org ↗
98.6%probability of exploitation in next 30 days
Very High Risk0.00%
Lower risk than most CVEs100th percentile — riskier than 100% of all scored CVEsHighest risk

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

How urgent is this, really

CVE-2026-34486 plotted by exploitation likelihood (EPSS) against impact (CVSS). The shaded corner — EPSS 50%+ and CVSS 7.0+ — is where this CVE sits: patch-first territory.

Where this sits among everything scored

Of 377,333 CVEs with a current EPSS score, this one falls in the ≥ 90% band (highlighted). Real counts from FIRST.org, not a sample — log-scaled since the landscape is heavily right-skewed.

Real-World Exposure

6 pkgs affected
☕org.apache.tomcat:tomcat-tribes☕org.apache.tomcat:tomcat-tribes☕org.apache.tomcat:tomcat-tribes☕org.apache.tomcat:tomcat☕org.apache.tomcat:tomcat☕org.apache.tomcat:tomcat

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Maven packages — download data is not available via public APIs for these ecosystems.

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

6 total 6 fixed
EcosystemPackageVulnerable rangeFix
☕Mavenorg.apache.tomcat:tomcat-tribes≥ 11.0.20&&< 11.0.2111.0.21org.apache.tomcat:tomcat-tribes:11.0.21
☕Mavenorg.apache.tomcat:tomcat-tribes≥ 10.1.53&&< 10.1.5410.1.54org.apache.tomcat:tomcat-tribes:10.1.54
☕Mavenorg.apache.tomcat:tomcat-tribes≥ 9.0.116&&< 9.0.1179.0.117org.apache.tomcat:tomcat-tribes:9.0.117
☕Mavenorg.apache.tomcat:tomcat≥ 11.0.20&&< 11.0.2111.0.21org.apache.tomcat:tomcat:11.0.21
☕Mavenorg.apache.tomcat:tomcat≥ 10.1.53&&< 10.1.5410.1.54org.apache.tomcat:tomcat:10.1.54
☕Mavenorg.apache.tomcat:tomcat≥ 9.0.116&&< 9.0.1179.0.117org.apache.tomcat:tomcat:9.0.117
Exploits & PoCs
3

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

striga-ai/CVE-2026-34486

EncryptInterceptor fail-open bypass in Apache Tomcat Tribes clustering l

⭐ 69🍴 14Sep 2026

AirSkye/CVE-2026-34486-poc

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

⭐ 12🍴 1Aug 2026

404-src/CVE-2026-34486

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

⭐ 9🍴 6Sep 2026

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.apache.tomcat:tomcat-tribes, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update org.apache.tomcat:tomcat-tribes to 11.0.21 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-34486 is resolved across your whole dependency graph.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

  4. How O3 protects you

    O3 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like CVE-2026-34486 can be triaged on real exposure rather than presence alone.

Tailored to CVE-2026-34486. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.

How to detect CVE-2026-34486

A community-maintained Nuclei template exists for this CVE. You can scan for it directly:

nuclei -id cve-2026-34486 -u https://target
Template
Apache Tomcat Tribes EncryptInterceptor Bypass - Remote Code Execution
Severity
critical
Impact
An unauthenticated attacker can achieve remote code execution by sending an unencrypted serialized Java object to the Tribes cluster receiver port.
Remediation
Users are recommended to upgrade to version 11.0.21, 10.1.54 or 9.0.117, which fix the issue.

Template by ProjectDiscovery nuclei-templates (DhiyaneshDk), MIT licensed. View the full template. Scan only systems you are authorised to test.

Fixing This On Your OS

If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.

Red HatImportant

This is an Important flaw in Apache Tomcat where a bypass in the EncryptInterceptor allows sensitive data to remain unencrypted. This could lead to information disclosure in Red Hat Enterprise Linux and Red Hat JBoss Web Server environments utilizing affected versions of Apache Tomcat.

ProductFixed inAdvisory
Red Hat Enterprise Linux 10tomcat-1:10.1.49-3.el10_2RHSA-2026:36788
Red Hat Enterprise Linux 10tomcat9-1:9.0.117-2.el10_2RHSA-2026:36790
Red Hat Enterprise Linux 10.0 Extended Update Supporttomcat-1:10.1.36-2.el10_0RHSA-2026:36787
Red Hat Enterprise Linux 10.0 Extended Update Supporttomcat9-1:9.0.87-6.el10_0RHSA-2026:36789
Red Hat Enterprise Linux 7 Extended Lifecycle Supporttomcat-0:7.0.76-18.el7_9RHSA-2026:38505
Red Hat Enterprise Linux 8tomcat-1:9.0.87-2.el8_10RHSA-2026:37137
Red Hat Enterprise Linux 8.8 Telecommunications Update Servicetomcat-1:9.0.87-2.el8_8RHSA-2026:37136
Red Hat Enterprise Linux 9tomcat-1:9.0.117-2.el9_8RHSA-2026:36879

Frequently Asked Questions

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.
O3 Security · Impact-Aware SCA

Is CVE-2026-34486 in your dependencies?

O3 Security finds CVE-2026-34486 across Maven dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.

Scan my dependencies How O3 SCA works
CVE-2026-34486: tomcat-tribes (KEV) | O3 Security