Is CVE-2026-34486 actively exploited?

Yes. Previdian tracks CVE-2026-34486 as a known exploited vulnerability. Confidence is confirmed.

What exploitation activity has Previdian observed?

Previdian has not yet recorded sensor-observed exploitation attempts for CVE-2026-34486. Our sensors continue to monitor for activity targeting this CVE.

Which versions are affected?

CVE-2026-34486 affects Apache Tomcat. Previdian lists 23 version rows; examples include 1:10.1.49-3.el10_2 to < *, 1:9.0.117-2.el10_2 to < *, and 1:10.1.36-2.el10_0 to < *.

Yes. CVE-2026-34486 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

Vulnerability report

Exploited in the wild Confirmed confidence In CISA KEV

CVE-2026-34486

Q: How should organizations remediate it?

Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.

Q: Is it in CISA KEV?

Yes. CVE-2026-34486 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

Apache Tomcat

Apache Tomcat · affected before *

Watch CVE-2026-34486 Browse KEV feed

Severity: CVSS 7.5 · High
Confidence: Confirmed
Exploit status: Exploited in the wild
EPSS: 6.6%
First observed: —
Last observed: —

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

CVE-2026-34486 is an unauthenticated vulnerability affecting Apache Tomcat. Missing Encryption of Sensitive Data vulnerability in Apache Tomcat due to the fix for CVE-2026-29146 allowing the bypass of the...

Is it exploited?

Yes. Previdian tracks this CVE as a known exploited vulnerability. Confidence is confirmed. Listed in CISA KEV. Also confirmed by third-party sources.

Who is affected?

Apache Tomcat affected before *.

What should we do?

Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.

Overview

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.

Vendor Product Affected Status

Red Hat Unaffected

Red Hat Enterprise Linux 10 tomcat

Before *

Unaffected

Red Hat Unaffected

Red Hat Enterprise Linux 10 tomcat9

Before *

Unaffected

Red Hat Unaffected

Red Hat Enterprise Linux 10.0 Extended Update Support tomcat

Before *

Unaffected

Red Hat Unaffected

Red Hat Enterprise Linux 10.0 Extended Update Support tomcat9

Before *

Unaffected

Red Hat Unaffected

Red Hat Enterprise Linux 7 Extended Lifecycle Support tomcat

Before *

Unaffected

Red Hat Unaffected

Red Hat Enterprise Linux 8 tomcat

Before *

Unaffected

Red Hat Unaffected

Red Hat Enterprise Linux 8.8 Telecommunications Update Service tomcat

Before *

Unaffected

Red Hat Unaffected

Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions tomcat

Before *

Unaffected

Red Hat Unaffected

Red Hat Enterprise Linux 9 tomcat

Before *

Unaffected

Red Hat Unaffected

Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions tomcat

Before *

Unaffected

Red Hat Unaffected

Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions tomcat

Before *

Unaffected

Red Hat Unaffected

Red Hat Enterprise Linux 9.6 Extended Update Support tomcat

Before *

Unaffected

Red Hat Unaffected

Red Hat JBoss Web Server 7.0.0 tomcat

All versions (default: unaffected)

Unaffected

Red Hat Unaffected

Red Hat JBoss Web Server 7.0 on RHEL 10 jws7-tomcat

Before *

Unaffected

Red Hat Unaffected

Red Hat JBoss Web Server 7.0 on RHEL 8 jws7-tomcat

Before *

Unaffected

Red Hat Unaffected

Red Hat JBoss Web Server 7.0 on RHEL 9 jws7-tomcat

Before *

Unaffected

Red Hat Unaffected

Red Hat Enterprise Linux 8 pki-deps:10.6/pki-servlet-engine

All versions (default: unaffected)

Unaffected

Red Hat Affected

Red Hat Enterprise Linux 9 pki-servlet-engine

All versions (default: affected)

Affected

Red Hat Unaffected

Red Hat JBoss Web Server 5 tomcat

All versions (default: unaffected)

Unaffected

Red Hat Unaffected

Red Hat JBoss Web Server 6 tomcat

All versions (default: unaffected)

Unaffected

Apache Software Foundation Affected

Apache Tomcat

11.0.20 10.1.53 9.0.116

Affected

View vendor advisory

Published: 09 Apr 2026
Exploitation Reported: 04 Aug 2026
Attack vector: Remote
Complexity: Low
Privileges: None
User interaction: None

CVE References

CVE Record CVE.org · CVE Record https://www.cve.org/CVERecord?id=CVE-2026-34486
Apache Mailing List lists.apache.org · Vendor Advisory https://lists.apache.org/thread/9510k5p5zdvt9pkkgtyp85mvwxo2qrly

Exploitation evidence

Why Previdian marks this CVE as exploited

Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.

Exploited in the wild

CISA

Recorded 04 Aug 2026

A trusted third party reported exploitation.

Proof of concept available

Nuclei Templates

Recorded 12 Jun 2026

Public scanner or PoC coverage increases practical exploitability.

Known exploited vulnerability sources

Per-source evidence links for KEV attestations are available through the Previdian Pro API.

Learn about Pro API access

Source	Added
CISA First	2026-08-04 16:45 UTC
CVE	2026-08-04 18:20 UTC

Detection

Operational artifacts and observed signals

Make the evidence actionable in scanner, SOC, and edge-control workflows.

Observed signals

Request targets
User-Agents
Callback hosts: 0; 0; 0

Request targets and User-Agents available in Pro. Callback host details available in Enterprise.

Scanner coverage

Nuclei template detected 01 Jun 2026.

View Nuclei template

Virtual patch status

No Previdian virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.

Learn about virtual patches →

Scanner Artifacts

Scanner and exploit-framework references linked to this CVE.

Scanner	Reference	Detected
Nuclei	https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-34486.yaml	01 Jun 2026

Risk and context

Severity, weaknesses, and research context

CVSS v3.1

7.5 High

Potential damage if exploited. Separate from whether attackers are using it.

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

EPSS

6.6%

Estimated chance of exploitation in the next 30 days. Previdian's warning comes from evidence, not this score.

Weaknesses

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

Recent mention · RecordedFuture

08 Sep 2026

August 2026 CVE Landscape

In August 2026, Insikt Group® identified 73 high-impact vulnerabilities that should be prioritized for remediation, 43 of which had a Very Critical Recorded Future Risk Score. This represents a 14% decrease from last month.

Read full advisory

All Mentions

Recent mention · RecordedFuture

August 2026 CVE Landscape

RecordedFuture · 08 Sep 2026

Recent mention · Tenable Blog

The Agentic AI threat cluster: Seven incidents, three actors, and what they mean for your exposure

Tenable Blog · 15 Aug 2026

Tenable’s Research Special Operations (RSO) team has been tracking a cluster of agentic AI threat activity since late July 2026. The Taiwan autonomous AI cyber attack confirmed what the cluster data already showed: near-autonomous offensive AI has crossed from theoretical risk to operational reality.Key TakeawaysTaiwan's Ministry of Digital Affairs confirmed a near-autonomous AI cyber attack in July 2026 in which autonomous agents mapped 21 connected government systems, compromised 85 accounts, and exfiltrated more than 2,564 personnel records in approximately four days.The Taiwan campaign...

Potential Proof of Concepts

These PoCs are unverified and could contain malware. Use at your own risk.

CypherHippie/CVE-2026-34486---unauthenticated-RCE-via-Java-deserialization

github · Created 2026-08-19 00:39:18 UTC · 0 stars · AI assessment 90%

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

Apache Tomcat Tribes EncryptInterceptor Bypass - Remote Code Execution

nuclei · Created Unknown

Timeline

From disclosure to observed exploitation

04 Aug 2026
18:20 UTC

KEV confirmed by CVE

Exploitation attested by an external source
04 Aug 2026
16:45 UTC

Added to CISA KEV

Listed in the CISA Known Exploited Vulnerabilities catalog
12 Jun 2026
14:21 UTC

Public PoC available

Public proof-of-concept code published
01 Jun 2026
15:34 UTC

Nuclei template available

Scanner coverage available
09 Apr 2026
19:35 UTC

CVE published

Vulnerability disclosed publicly
30 Mar 2026
07:57 UTC

CVE ID reserved

Identifier reserved by the CNA

Pro API

Automate this intelligence

Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.

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Evidence confidence and provenance
First-party sensor telemetry
PoC and scanner references
Affected versions and enrichment
Automation-ready JSON delivery

GET /api/v2/pro/kevs/CVE-2026-34486

Free JSON includes basic KEV fields

{
  "cve_id": "CVE-2026-34486",
  "confidence": "Confirmed",
  "cvss_score": 7.5,
  "cvss_estimated": false,
  "epss_score": 0.06561,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": false
  },
  "sensor_telemetry": { "attempts": 0, "sensors": 0 }
}

CVE-2026-34486

Apache Tomcat

Tags

CVE References

Exploited in the wild

Proof of concept available

Known exploited vulnerability sources

Observed signals

Scanner coverage

Virtual patch status

Scanner Artifacts

Weaknesses

August 2026 CVE Landscape

All Mentions

Potential Proof of Concepts

KEV confirmed by CVE

Added to CISA KEV

Public PoC available

Nuclei template available

CVE published

CVE ID reserved

Automate this intelligence