CVE-2026-34486 (GCVE-0-2026-34486)

Vulnerability from cvelistv5 – Published: 2026-04-09 19:35 – Updated: 2026-08-10 12:05
VLAI CISA KEVIntel
Title
Apache Tomcat: Fix for CVE-2026-29146 allowed bypass of EncryptInterceptor
Summary
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.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
SSVC
Exploitation: active Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-04 17:42 UTC
CWE
  • CWE-311 - Missing Encryption of Sensitive Data
  • CWE-807 - Reliance on Untrusted Inputs in a Security Decision
Assigner
References
URL Tags
https://lists.apache.org/thread/9510k5p5zdvt9pkkg… vendor-advisory
https://socradar.io/blog/snowlight-government-chi… third-party-advisory
https://www.cisa.gov/known-exploited-vulnerabilit… government-resource
https://www.vicarius.io/vsociety/posts/cve-2026-3…
https://www.vicarius.io/vsociety/posts/cve-2026-3…
https://access.redhat.com/security/cve/CVE-2026-34486 vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2457027 issue-trackingx_refsource_REDHAT
https://security.access.redhat.com/data/csaf/v2/v… x_sadp-csaf-vex
https://access.redhat.com/errata/RHSA-2026:39188 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:38505 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36787 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36789 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36788 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36790 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:37137 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:37136 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36878 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36876 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36877 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36879 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:39189 vendor-advisoryx_refsource_REDHAT
Impacted products
Vendor Product Version
Apache Software Foundation Apache Tomcat Affected: 11.0.20 (semver)
Affected: 10.1.53 (semver)
Affected: 9.0.116 (semver)
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Red Hat Red Hat Enterprise Linux 10 Unaffected: 1:10.1.49-3.el10_2 , < * (rpm)
    cpe:/o:redhat:enterprise_linux:10.2
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Red Hat Red Hat Enterprise Linux 10 Unaffected: 1:9.0.117-2.el10_2 , < * (rpm)
    cpe:/o:redhat:enterprise_linux:10.2
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Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support Unaffected: 1:10.1.36-2.el10_0 , < * (rpm)
    cpe:/o:redhat:enterprise_linux_eus:10.0
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Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support Unaffected: 1:9.0.87-6.el10_0 , < * (rpm)
    cpe:/o:redhat:enterprise_linux_eus:10.0
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Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support Unaffected: 0:7.0.76-18.el7_9 , < * (rpm)
    cpe:/o:redhat:rhel_els:7
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Red Hat Red Hat Enterprise Linux 8 Unaffected: 1:9.0.87-2.el8_10 , < * (rpm)
    cpe:/a:redhat:enterprise_linux:8
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Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service Unaffected: 1:9.0.87-2.el8_8 , < * (rpm)
    cpe:/a:redhat:rhel_tus:8.8
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Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions Unaffected: 1:9.0.87-2.el8_8 , < * (rpm)
    cpe:/a:redhat:rhel_e4s:8.8
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Red Hat Red Hat Enterprise Linux 9 Unaffected: 1:9.0.117-2.el9_8 , < * (rpm)
    cpe:/a:redhat:enterprise_linux:9
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Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions Unaffected: 1:9.0.87-2.el9_2 , < * (rpm)
    cpe:/a:redhat:rhel_e4s:9.2
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Red Hat Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions Unaffected: 1:9.0.87-2.el9_4 , < * (rpm)
    cpe:/a:redhat:rhel_e4s:9.4
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Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support Unaffected: 1:9.0.87-4.el9_6 , < * (rpm)
    cpe:/a:redhat:rhel_eus:9.6
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Red Hat Red Hat JBoss Web Server 7.0.0     cpe:/a:redhat:jboss_enterprise_web_server:7.0
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Red Hat Red Hat JBoss Web Server 7.0 on RHEL 10 Unaffected: 0:11.0.21-5.redhat_00004.1.el10jws , < * (rpm)
    cpe:/a:redhat:jboss_enterprise_web_server:7.0::el10
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Red Hat Red Hat JBoss Web Server 7.0 on RHEL 8 Unaffected: 0:11.0.21-5.redhat_00004.1.el8jws , < * (rpm)
    cpe:/a:redhat:jboss_enterprise_web_server:7.0::el8
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Red Hat Red Hat JBoss Web Server 7.0 on RHEL 9 Unaffected: 0:11.0.21-5.redhat_00004.1.el9jws , < * (rpm)
    cpe:/a:redhat:jboss_enterprise_web_server:7.0::el9
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Red Hat Red Hat Enterprise Linux 6     cpe:/o:redhat:enterprise_linux:6
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Red Hat Red Hat Enterprise Linux 8     cpe:/o:redhat:enterprise_linux:8
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Red Hat Red Hat Enterprise Linux 9     cpe:/o:redhat:enterprise_linux:9
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Red Hat Red Hat JBoss Web Server 5     cpe:/a:redhat:jboss_enterprise_web_server:5
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Red Hat Red Hat JBoss Web Server 6     cpe:/a:redhat:jboss_enterprise_web_server:6
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Credits
Bartlomiej Dmitruk at striga.ai
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: ac2344a6-31bc-4723-9ed3-ced1cafad44a

Vulnerability ID: CVE-2026-34486

Status: Confirmed

Status Updated: 2026-08-04 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2026-08-04
Asserted: 2026-08-04
Scope
Notes: Apache Tomcat Missing Encryption of Sensitive Data Vulnerability | Affected: Apache / Tomcat | Description: Apache Tomcat contains a missing encryption of sensitive data vulnerability that allows the bypass of the EncryptInterceptor. | 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. | Due date: 2026-08-07 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): 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
Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev

Details
Cwes CWE-311
Feed CISA Known Exploited Vulnerabilities Catalog
Product Tomcat
Due Date 2026-08-07
Date Added 2026-08-04
Vendorproject Apache
Vulnerabilityname Apache Tomcat Missing Encryption of Sensitive Data Vulnerability
Knownransomwarecampaignuse Unknown
References
Created: 2026-08-04 18:00 UTC | Updated: 2026-08-04 18:00 UTC
KEVIntel
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 4e9a3540-8de8-40a3-980a-a0e3aeded844

Vulnerability ID: CVE-2026-34486

Status: Confirmed

Status Updated: 2026-08-04 16:45 UTC

Exploited: Yes

Timestamps
First Seen: 2026-08-04
Asserted: 2026-08-04
Scope
Notes: Apache Tomcat: Fix for CVE-2026-29146 allowed bypass of EncryptInterceptor | Affected: Apache Software Foundation / Apache Tomcat | CVSS: 7.5 (HIGH) | EPSS: 0.42627 | Used in malware: unknown | Not yet in CISA KEV: False
Evidence

Type: Public Report

Signal: Successful Exploitation

Confidence: 70%

Source: kevintel

Details
Feed KEVIntel (kevintel.com)
Title Apache Tomcat: Fix for CVE-2026-29146 allowed bypass of EncryptInterceptor
Vendor Apache Software Foundation
Product Apache Tomcat
Added Date 2026-08-04T16:45:52.078Z
Cvss Score 7.5
Epss Score 0.42627
Cvss Severity HIGH
Epss Percentile 0.9858
Used In Malware unknown
Ahead Of Cisa Kev None
Not Yet In Cisa Kev False
References
Created: 2026-08-04 18:00 UTC | Updated: 2026-08-04 18:00 UTC
Show details on NVD website
To clipboard 

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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.