Vulnerability-Lookup

CVE-2026-34483 (GCVE-0-2026-34483)

Vulnerability from cvelistv5 – Published: 2026-04-09 19:30 – Updated: 2026-04-10 20:17

Title

Apache Tomcat: Incomplete escaping of JSON access logs

Summary

Improper Encoding or Escaping of Output vulnerability in the JsonAccessLogValve component of Apache Tomcat. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.20, from 10.1.0-M1 through 10.1.53, from 9.0.40 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 20:16 UTC

CWE

CWE-116 - Improper Encoding or Escaping of Output

Assigner

apache mitre root

References

2 references

URL	Tags
https://lists.apache.org/thread/j1w7304yonlr8vo1t…	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: 9.0.40 , ≤ 9.0.116 (semver) Affected: 8.5.84 , ≤ 8.5.100 (semver) Unaffected: 0 , ≤ 8.5.83 (semver)	guessed

Credits

Bartlomiej Dmitruk, striga.ai

Show details on NVD website

JSON

To clipboard

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RHSA-2026:25341

Vulnerability from csaf_opensuse - Published: 2026-06-11 00:00 - Updated: 2026-09-16 18:30

Summary

security update for tomcat9

Severity

Important

Scope

13 vulnerabilities in this advisory, including CVE-2026-34483.

CVE-2026-34483

4.8 (Medium)


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

Recommended: 8 products

Open the full advisory

RHSA-2026:26323

Vulnerability from csaf_opensuse - Published: 2026-06-16 00:00 - Updated: 2026-09-16 18:30

Summary

security update for tomcat

Severity

Important

Scope

13 vulnerabilities in this advisory, including CVE-2026-34483.

CVE-2026-34483

4.8 (Medium)


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

Recommended: 8 products

Open the full advisory

RHSA-2026:36790

Vulnerability from csaf_opensuse - Published: 2026-07-08 16:38 - Updated: 2026-09-18 10:15

Summary

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

Severity

Important

Scope

13 vulnerabilities in this advisory, including CVE-2026-34483.

CVE-2026-34483

A flaw was found in the JsonAccessLogValve component of Apache Tomcat. This improper encoding or escaping of output vulnerability could allow an attacker to inject specially crafted data into log files. This could lead to information disclosure or other unintended consequences when the logs are processed or viewed.

5.4 (Medium)


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

Fixed: 9 products

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

Open the full advisory

RLSA-2026:36790 (CVE-2025-66614)

Vulnerability from osv_rocky – Published: 2026-07-10 12:05 – Updated: 2026-07-24 06:08 – Source website

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-2026-34483.

CVE-2026-34483

4.8 (Medium)


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

Recommended: 21 products

Open the full advisory

SUSE-SU-2026:1572-1

Vulnerability from csaf_suse - Published: 2026-04-23 15:52 - Updated: 2026-09-16 19:18

Summary

Security update for tomcat

Severity

Important

Scope

11 vulnerabilities in this advisory, including CVE-2026-34483.

CVE-2026-34483

4.8 (Medium)


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

Recommended: 45 products

Open the full advisory

SUSE-SU-2026:1603-1

Vulnerability from csaf_suse - Published: 2026-04-24 11:47 - Updated: 2026-04-24 11:47

Summary

Security update for tomcat10

Severity

Important

Scope

11 vulnerabilities in this advisory, including CVE-2026-34483.

CVE-2026-34483

4.8 (Medium)


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

Recommended: 49 products

Open the full advisory

SUSE-SU-2026:1604-1

Vulnerability from csaf_suse - Published: 2026-04-24 11:48 - Updated: 2026-04-24 11:48

Summary

Security update for tomcat

Severity

Important

Scope

11 vulnerabilities in this advisory, including CVE-2026-34483.

CVE-2026-34483

4.8 (Medium)


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

Recommended: 77 products

Open the full advisory

SUSE-SU-2026:21366-1

Vulnerability from csaf_suse - Published: 2026-04-21 11:42 - Updated: 2026-09-16 19:44

Summary

Security update for tomcat11

Severity

Important

Scope

11 vulnerabilities in this advisory, including CVE-2026-34483.

CVE-2026-34483

4.8 (Medium)


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

Recommended: 22 products

Open the full advisory

SUSE-SU-2026:21378-1

Vulnerability from csaf_suse - Published: 2026-04-22 11:07 - Updated: 2026-09-16 19:44

Summary

Security update for tomcat

Severity

Important

Scope

11 vulnerabilities in this advisory, including CVE-2026-34483.

CVE-2026-34483

4.8 (Medium)


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

Recommended: 22 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.

Action not permitted

CVE-2026-34483 (GCVE-0-2026-34483)

RLSA-2026:36790 (CVE-2025-66614)

Tags

Sightings

Nomenclature

Related by attack behaviour