Vulnerability-Lookup

CVE-2026-34487 (GCVE-0-2026-34487)

Vulnerability from cvelistv5 – Published: 2026-04-09 19:36 – Updated: 2026-04-10 17:49

Title

Apache Tomcat: Cloud membership for clustering component exposed the Kubernetes bearer token

Summary

Insertion of Sensitive Information into Log File vulnerability in the cloud membership for clustering component of Apache Tomcat exposed the Kubernetes bearer token. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.20, from 10.1.0-M1 through 10.1.53, from 9.0.13 through 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: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-04-10 17:47 UTC

CWE

CWE-532 - Insertion of Sensitive Information into Log File

Assigner

apache mitre root

References

2 references

URL	Tags
https://lists.apache.org/thread/4xpkwolpkrj8v5xzp…	vendor-advisory
http://www.openwall.com/lists/oss-security/2026/0…

Impacted products

1 product

Vendor	Product	Version	CPE status
Apache Software Foundation	Apache Tomcat	Affected: 11.0.0-M1 , ≤ 11.0.20 (semver) Affected: 10.1.0-M1 , ≤ 10.1.53 (semver) Affected: 9.0.13 , ≤ 9.0.116 (semver)	guessed

Credits

Bartlomiej Dmitruk, striga.ai

Show details on NVD website

JSON

To clipboard

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GHSA-X4M4-345F-5H5G

Vulnerability from github – Published: 2026-04-09 21:31 – Updated: 2026-08-12 18:49

Summary

Apache Tomcat vulnerable to Insertion of Sensitive Information into Log File

Details

Insertion of Sensitive Information into Log File vulnerability in the cloud membership for clustering component of Apache Tomcat exposed the Kubernetes bearer token.

This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.20, from 10.1.0-M1 through 10.1.53, from 9.0.13 through 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

Show details on source website

JSON

To clipboard

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  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Apache Tomcat vulnerable to Insertion of Sensitive Information into Log File"
}

OPENSUSE-SU-2026:10547-1

Vulnerability from csaf_opensuse - Published: 2026-04-14 00:00 - Updated: 2026-04-14 00:00

Summary

tomcat-9.0.117-1.1 on GA media

Severity

Moderate

Scope

10 vulnerabilities in this advisory, including CVE-2026-34487.

CVE-2026-34487

5.9 (Medium)


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

Recommended: 44 products

Open the full advisory

OPENSUSE-SU-2026:10548-1

Vulnerability from csaf_opensuse - Published: 2026-04-14 00:00 - Updated: 2026-04-14 00:00

Summary

tomcat10-10.1.54-1.1 on GA media

Severity

Moderate

Scope

10 vulnerabilities in this advisory, including CVE-2026-34487.

CVE-2026-34487

5.9 (Medium)


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

Recommended: 44 products

Open the full advisory

OPENSUSE-SU-2026:10549-1

Vulnerability from csaf_opensuse - Published: 2026-04-14 00:00 - Updated: 2026-04-14 00:00

Summary

tomcat11-11.0.21-1.1 on GA media

Severity

Moderate

Scope

10 vulnerabilities in this advisory, including CVE-2026-34487.

CVE-2026-34487

5.9 (Medium)


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

Recommended: 44 products

Open the full advisory

OPENSUSE-SU-2026:20595-1

Vulnerability from csaf_opensuse - Published: 2026-04-21 11:43 - Updated: 2026-04-21 11:43

Summary

Security update for tomcat11

Severity

Important

Scope

11 vulnerabilities in this advisory, including CVE-2026-34487.

CVE-2026-34487

5.9 (Medium)


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

Recommended: 11 products

Open the full advisory

RHSA-2026:20405

Vulnerability from csaf_redhat - Published: 2026-05-26 12:59 - Updated: 2026-08-25 14:43

Summary

Red Hat Security Advisory: Red Hat JBoss Web Server 6.2.3 release and security update

Severity

Important

Scope

7 vulnerabilities in this advisory, including CVE-2026-34487.

CVE-2026-34487

A flaw was found in Apache Tomcat. The cloud membership for clustering component was vulnerable to the insertion of sensitive information into log files. This vulnerability could lead to the exposure of the Kubernetes bearer token, which is a credential used for authentication within a Kubernetes cluster, potentially allowing unauthorized access to cluster resources.

6.5 (Medium)


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

Fixed: 33 products

https://access.redhat.com/errata/RHSA-2026:20405

Open the full advisory

RHSA-2026:20406

Vulnerability from csaf_redhat - Published: 2026-05-26 12:55 - Updated: 2026-08-25 14:43

Summary

Red Hat Security Advisory: Red Hat JBoss Web Server 6.2.3 release and security update

Severity

Important

Scope

7 vulnerabilities in this advisory, including CVE-2026-34487.

CVE-2026-34487

6.5 (Medium)


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

Fixed: 1 product

https://access.redhat.com/errata/RHSA-2026:20406

Open the full advisory

RHSA-2026:36790

Vulnerability from csaf_redhat - Published: 2026-07-08 16:38 - Updated: 2026-09-14 05:07

Summary

Red Hat Security Advisory: tomcat9 security, bug fix, and enhancement update

Severity

Important

Scope

13 vulnerabilities in this advisory, including CVE-2026-34487.

CVE-2026-34487

6.5 (Medium)


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

Fixed: 9 products

https://access.redhat.com/errata/RHSA-2026:36790

Open the full advisory

rlsa-2026:36790

Vulnerability from osv_rocky

Published

2026-07-10 12:05

Modified

2026-07-24 06:08

Summary

Important: tomcat9 security, bug fix, and enhancement update

Details

Tomcat is the servlet container that is used in the official Reference Implementation for the Java Servlet and JavaServer Pages technologies. The Java Servlet and JavaServer Pages specifications are developed by Sun under the Java Community Process. Tomcat is developed in an open and participatory environment and released under the Apache Software License version 2.0. Tomcat is intended to be a collaboration of the best-of-breed developers from around the world.

Security Fix(es):

Apache Tomcat: Apache Tomcat: Information disclosure via Padding Oracle vulnerability in EncryptInterceptor (CVE-2026-29146)
Apache Tomcat: Apache Tomcat: Missing Encryption of Sensitive Data due to EncryptInterceptor bypass (CVE-2026-34486)

Bug Fix(es) and Enhancement(s):

Remove tomcat clustering JAR from RPM builds (JIRA:Rocky Linux-185571)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Severity

7.5 (High)


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

Credits

Rocky Enterprise Software Foundation

Red Hat

References

URL

Type

	https://errata.rockylinux.org/RLSA-2026:36790	ADVISORY
	https://bugzilla.redhat.com/show_bug.cgi?id=2457027	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2457020	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2457031	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2457040	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2440430	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2457043	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2440426	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2440437	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2457044	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2457037	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2457039	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2457038	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2457025	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Rocky Linux:10",
        "name": "tomcat9",
        "purl": "pkg:rpm/rocky-linux/tomcat9?distro=rocky-linux-10-aarch64\u0026epoch=1"
      },
      "ranges": [
        {
          "database_specific": {
            "yum_repository": "AppStream"
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1:9.0.117-2.el10_2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "credits": [
    {
      "name": "Rocky Enterprise Software Foundation"
    },
    {
      "name": "Red Hat"
    }
  ],
  "details": "Tomcat is the servlet container that is used in the official Reference Implementation for the Java Servlet and JavaServer Pages technologies. The Java Servlet and JavaServer Pages specifications are developed by Sun under the Java Community Process.  Tomcat is developed in an open and participatory environment and released under the Apache Software License version 2.0. Tomcat is intended to be a collaboration of the best-of-breed developers from around the world.\n\nSecurity Fix(es):\n\n* Apache Tomcat: Apache Tomcat: Information disclosure via Padding Oracle vulnerability in EncryptInterceptor (CVE-2026-29146)\n\n* Apache Tomcat: Apache Tomcat: Missing Encryption of Sensitive Data due to EncryptInterceptor bypass (CVE-2026-34486)\n\nBug Fix(es) and Enhancement(s):\n\n* Remove tomcat clustering JAR from RPM builds (JIRA:Rocky Linux-185571)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.",
  "id": "RLSA-2026:36790",
  "modified": "2026-07-24T06:08:00.129174Z",
  "published": "2026-07-10T12:05:34.876921Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://errata.rockylinux.org/RLSA-2026:36790"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2457027"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2457020"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2457031"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2457040"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2440430"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2457043"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2440426"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2440437"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2457044"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2457037"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2457039"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2457038"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2457025"
    }
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Important: tomcat9 security, bug fix, and enhancement update",
  "upstream": [
    "CVE-2025-66614",
    "CVE-2026-24733",
    "CVE-2026-24734",
    "CVE-2026-24880",
    "CVE-2026-25854",
    "CVE-2026-29129",
    "CVE-2026-29145",
    "CVE-2026-29146",
    "CVE-2026-32990",
    "CVE-2026-34483",
    "CVE-2026-34486",
    "CVE-2026-34487",
    "CVE-2026-34500"
  ]
}

SUSE-SU-2026:1558-1

Vulnerability from csaf_suse - Published: 2026-04-22 16:24 - Updated: 2026-04-22 16:24

Summary

Security update for tomcat11

Severity

Important

Scope

11 vulnerabilities in this advisory, including CVE-2026-34487.

CVE-2026-34487

5.9 (Medium)


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

Recommended: 21 products

Open the full advisory

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

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CVE-2026-34487 (GCVE-0-2026-34487)

Vulnerability from osv_rocky

Tags

Sightings

Nomenclature

Related by attack behaviour