RHSA-2026:36787

Vulnerability from csaf_redhat - Published: 2026-07-08 16:16 - Updated: 2026-07-09 18:00
Summary
Red Hat Security Advisory: tomcat security update
Severity
Important
Notes
Topic: An update for tomcat is now available for Red Hat Enterprise Linux 10.0 Extended Update Support. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details: Apache Tomcat is a servlet container for the Java Servlet and JavaServer Pages (JSP) technologies. 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) 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.
Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
CVE-2026-29146

A flaw was found in Apache Tomcat. This Padding Oracle vulnerability, present in the EncryptInterceptor with its default configuration, could allow a remote attacker to decrypt sensitive information. By exploiting weaknesses in the encryption padding, an attacker may be able to gain unauthorized access to data that should remain confidential.

7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CWE-1240 - Use of a Cryptographic Primitive with a Risky Implementation
Affected products
Product Identifier Version Remediation
Unresolved product id: AppStream-10.0.Z.E2S:tomcat-1:10.1.36-2.el10_0.noarch —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.0.Z.E2S:tomcat-1:10.1.36-2.el10_0.src —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.0.Z.E2S:tomcat-admin-webapps-1:10.1.36-2.el10_0.noarch —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.0.Z.E2S:tomcat-docs-webapp-1:10.1.36-2.el10_0.noarch —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.0.Z.E2S:tomcat-el-5.0-api-1:10.1.36-2.el10_0.noarch —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.0.Z.E2S:tomcat-jsp-3.1-api-1:10.1.36-2.el10_0.noarch —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.0.Z.E2S:tomcat-lib-1:10.1.36-2.el10_0.noarch —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.0.Z.E2S:tomcat-servlet-6.0-api-1:10.1.36-2.el10_0.noarch —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.0.Z.E2S:tomcat-webapps-1:10.1.36-2.el10_0.noarch —
Vendor Fix fix
Workaround
Threats
Impact Important
CVE-2026-34486

A flaw was found in Apache Tomcat. This vulnerability, categorized as Missing Encryption of Sensitive Data, arises from a bypass in the EncryptInterceptor, a component designed to ensure data encryption. This bypass, introduced as a fix for CVE-2026-29146, allows sensitive data to remain unencrypted, potentially leading to information disclosure.

7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CWE-807 - Reliance on Untrusted Inputs in a Security Decision
Affected products
Product Identifier Version Remediation
Unresolved product id: AppStream-10.0.Z.E2S:tomcat-1:10.1.36-2.el10_0.noarch —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.0.Z.E2S:tomcat-1:10.1.36-2.el10_0.src —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.0.Z.E2S:tomcat-admin-webapps-1:10.1.36-2.el10_0.noarch —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.0.Z.E2S:tomcat-docs-webapp-1:10.1.36-2.el10_0.noarch —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.0.Z.E2S:tomcat-el-5.0-api-1:10.1.36-2.el10_0.noarch —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.0.Z.E2S:tomcat-jsp-3.1-api-1:10.1.36-2.el10_0.noarch —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.0.Z.E2S:tomcat-lib-1:10.1.36-2.el10_0.noarch —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.0.Z.E2S:tomcat-servlet-6.0-api-1:10.1.36-2.el10_0.noarch —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.0.Z.E2S:tomcat-webapps-1:10.1.36-2.el10_0.noarch —
Vendor Fix fix
Workaround
Threats
Impact Important
References
To clipboard 

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          "text": "A flaw was found in Apache Tomcat. This Padding Oracle vulnerability, present in the EncryptInterceptor with its default configuration, could allow a remote attacker to decrypt sensitive information. By exploiting weaknesses in the encryption padding, an attacker may be able to gain unauthorized access to data that should remain confidential.",
          "title": "Vulnerability description"
        },
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          "text": "Apache Tomcat: Apache Tomcat: Information disclosure via Padding Oracle vulnerability in EncryptInterceptor",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "Important: A padding oracle vulnerability exists in Apache Tomcat\u0027s EncryptInterceptor when using its default configuration. This flaw could allow a remote attacker to decrypt sensitive information by exploiting weaknesses in the encryption padding. This vulnerability is not exploitable in any supported Red Hat Products. This is due to the fact EncryptInterceptor is a Tomcat component used to encrypt communication between different nodes in a cluster, however Tomcat\u0027s clustering is not tested and supported by Red Hat since Red Hat Enterprise Linux 7. More details about Tomcat\u0027s clustering in Red Hat supported products can be found at the following Solution page:\n\n~~~\nhttps://access.redhat.com/solutions/67862\n~~~",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
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        },
        {
          "category": "external",
          "summary": "https://lists.apache.org/thread/lzt04z2pb3dc5tk85obn80xygw3z1p0w",
          "url": "https://lists.apache.org/thread/lzt04z2pb3dc5tk85obn80xygw3z1p0w"
        }
      ],
      "release_date": "2026-04-09T19:21:57.289000+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-07-08T16:16:19+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
          "product_ids": [
            "AppStream-10.0.Z.E2S:tomcat-1:10.1.36-2.el10_0.noarch",
            "AppStream-10.0.Z.E2S:tomcat-1:10.1.36-2.el10_0.src",
            "AppStream-10.0.Z.E2S:tomcat-admin-webapps-1:10.1.36-2.el10_0.noarch",
            "AppStream-10.0.Z.E2S:tomcat-docs-webapp-1:10.1.36-2.el10_0.noarch",
            "AppStream-10.0.Z.E2S:tomcat-el-5.0-api-1:10.1.36-2.el10_0.noarch",
            "AppStream-10.0.Z.E2S:tomcat-jsp-3.1-api-1:10.1.36-2.el10_0.noarch",
            "AppStream-10.0.Z.E2S:tomcat-lib-1:10.1.36-2.el10_0.noarch",
            "AppStream-10.0.Z.E2S:tomcat-servlet-6.0-api-1:10.1.36-2.el10_0.noarch",
            "AppStream-10.0.Z.E2S:tomcat-webapps-1:10.1.36-2.el10_0.noarch"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:36787"
        },
        {
          "category": "workaround",
          "details": "This vulnerability can be mitigated by removing the affected jar file from the tomcat installation. It can be achieved by running the following command as root:\n\n~~~\nsystemctl stop tomcat\nrm -fv /usr/share/java/tomcat/catalina-tribes.jar\nsystemctl start tomcat\n~~~\n\nIt\u0027s important to notice if the Tomcat instance is configured to run with clustering, this may lead to errors when restarting the tomcat service. Red Hat\u0027s distributed Apache Tomcat should not be run with Clustering enabled, so make sure to disable such configuration before proceed with the mitigation if that\u0027s the case.",
          "product_ids": [
            "AppStream-10.0.Z.E2S:tomcat-1:10.1.36-2.el10_0.noarch",
            "AppStream-10.0.Z.E2S:tomcat-1:10.1.36-2.el10_0.src",
            "AppStream-10.0.Z.E2S:tomcat-admin-webapps-1:10.1.36-2.el10_0.noarch",
            "AppStream-10.0.Z.E2S:tomcat-docs-webapp-1:10.1.36-2.el10_0.noarch",
            "AppStream-10.0.Z.E2S:tomcat-el-5.0-api-1:10.1.36-2.el10_0.noarch",
            "AppStream-10.0.Z.E2S:tomcat-jsp-3.1-api-1:10.1.36-2.el10_0.noarch",
            "AppStream-10.0.Z.E2S:tomcat-lib-1:10.1.36-2.el10_0.noarch",
            "AppStream-10.0.Z.E2S:tomcat-servlet-6.0-api-1:10.1.36-2.el10_0.noarch",
            "AppStream-10.0.Z.E2S:tomcat-webapps-1:10.1.36-2.el10_0.noarch"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
            "version": "3.1"
          },
          "products": [
            "AppStream-10.0.Z.E2S:tomcat-1:10.1.36-2.el10_0.noarch",
            "AppStream-10.0.Z.E2S:tomcat-1:10.1.36-2.el10_0.src",
            "AppStream-10.0.Z.E2S:tomcat-admin-webapps-1:10.1.36-2.el10_0.noarch",
            "AppStream-10.0.Z.E2S:tomcat-docs-webapp-1:10.1.36-2.el10_0.noarch",
            "AppStream-10.0.Z.E2S:tomcat-el-5.0-api-1:10.1.36-2.el10_0.noarch",
            "AppStream-10.0.Z.E2S:tomcat-jsp-3.1-api-1:10.1.36-2.el10_0.noarch",
            "AppStream-10.0.Z.E2S:tomcat-lib-1:10.1.36-2.el10_0.noarch",
            "AppStream-10.0.Z.E2S:tomcat-servlet-6.0-api-1:10.1.36-2.el10_0.noarch",
            "AppStream-10.0.Z.E2S:tomcat-webapps-1:10.1.36-2.el10_0.noarch"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "Apache Tomcat: Apache Tomcat: Information disclosure via Padding Oracle vulnerability in EncryptInterceptor"
    },
    {
      "cve": "CVE-2026-34486",
      "cwe": {
        "id": "CWE-807",
        "name": "Reliance on Untrusted Inputs in a Security Decision"
      },
      "discovery_date": "2026-04-09T20:01:26.022716+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2457027"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in Apache Tomcat. This vulnerability, categorized as Missing Encryption of Sensitive Data, arises from a bypass in the EncryptInterceptor, a component designed to ensure data encryption. This bypass, introduced as a fix for CVE-2026-29146, allows sensitive data to remain unencrypted, potentially leading to information disclosure.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "Apache Tomcat: Apache Tomcat: Missing Encryption of Sensitive Data due to EncryptInterceptor bypass",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "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.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
      "product_status": {
        "fixed": [
          "AppStream-10.0.Z.E2S:tomcat-1:10.1.36-2.el10_0.noarch",
          "AppStream-10.0.Z.E2S:tomcat-1:10.1.36-2.el10_0.src",
          "AppStream-10.0.Z.E2S:tomcat-admin-webapps-1:10.1.36-2.el10_0.noarch",
          "AppStream-10.0.Z.E2S:tomcat-docs-webapp-1:10.1.36-2.el10_0.noarch",
          "AppStream-10.0.Z.E2S:tomcat-el-5.0-api-1:10.1.36-2.el10_0.noarch",
          "AppStream-10.0.Z.E2S:tomcat-jsp-3.1-api-1:10.1.36-2.el10_0.noarch",
          "AppStream-10.0.Z.E2S:tomcat-lib-1:10.1.36-2.el10_0.noarch",
          "AppStream-10.0.Z.E2S:tomcat-servlet-6.0-api-1:10.1.36-2.el10_0.noarch",
          "AppStream-10.0.Z.E2S:tomcat-webapps-1:10.1.36-2.el10_0.noarch"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-34486"
        },
        {
          "category": "external",
          "summary": "RHBZ#2457027",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2457027"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-34486",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-34486"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-34486",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-34486"
        },
        {
          "category": "external",
          "summary": "https://lists.apache.org/thread/9510k5p5zdvt9pkkgtyp85mvwxo2qrly",
          "url": "https://lists.apache.org/thread/9510k5p5zdvt9pkkgtyp85mvwxo2qrly"
        }
      ],
      "release_date": "2026-04-09T19:35:35.994000+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-07-08T16:16:19+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
          "product_ids": [
            "AppStream-10.0.Z.E2S:tomcat-1:10.1.36-2.el10_0.noarch",
            "AppStream-10.0.Z.E2S:tomcat-1:10.1.36-2.el10_0.src",
            "AppStream-10.0.Z.E2S:tomcat-admin-webapps-1:10.1.36-2.el10_0.noarch",
            "AppStream-10.0.Z.E2S:tomcat-docs-webapp-1:10.1.36-2.el10_0.noarch",
            "AppStream-10.0.Z.E2S:tomcat-el-5.0-api-1:10.1.36-2.el10_0.noarch",
            "AppStream-10.0.Z.E2S:tomcat-jsp-3.1-api-1:10.1.36-2.el10_0.noarch",
            "AppStream-10.0.Z.E2S:tomcat-lib-1:10.1.36-2.el10_0.noarch",
            "AppStream-10.0.Z.E2S:tomcat-servlet-6.0-api-1:10.1.36-2.el10_0.noarch",
            "AppStream-10.0.Z.E2S:tomcat-webapps-1:10.1.36-2.el10_0.noarch"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:36787"
        },
        {
          "category": "workaround",
          "details": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.",
          "product_ids": [
            "AppStream-10.0.Z.E2S:tomcat-1:10.1.36-2.el10_0.noarch",
            "AppStream-10.0.Z.E2S:tomcat-1:10.1.36-2.el10_0.src",
            "AppStream-10.0.Z.E2S:tomcat-admin-webapps-1:10.1.36-2.el10_0.noarch",
            "AppStream-10.0.Z.E2S:tomcat-docs-webapp-1:10.1.36-2.el10_0.noarch",
            "AppStream-10.0.Z.E2S:tomcat-el-5.0-api-1:10.1.36-2.el10_0.noarch",
            "AppStream-10.0.Z.E2S:tomcat-jsp-3.1-api-1:10.1.36-2.el10_0.noarch",
            "AppStream-10.0.Z.E2S:tomcat-lib-1:10.1.36-2.el10_0.noarch",
            "AppStream-10.0.Z.E2S:tomcat-servlet-6.0-api-1:10.1.36-2.el10_0.noarch",
            "AppStream-10.0.Z.E2S:tomcat-webapps-1:10.1.36-2.el10_0.noarch"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
            "version": "3.1"
          },
          "products": [
            "AppStream-10.0.Z.E2S:tomcat-1:10.1.36-2.el10_0.noarch",
            "AppStream-10.0.Z.E2S:tomcat-1:10.1.36-2.el10_0.src",
            "AppStream-10.0.Z.E2S:tomcat-admin-webapps-1:10.1.36-2.el10_0.noarch",
            "AppStream-10.0.Z.E2S:tomcat-docs-webapp-1:10.1.36-2.el10_0.noarch",
            "AppStream-10.0.Z.E2S:tomcat-el-5.0-api-1:10.1.36-2.el10_0.noarch",
            "AppStream-10.0.Z.E2S:tomcat-jsp-3.1-api-1:10.1.36-2.el10_0.noarch",
            "AppStream-10.0.Z.E2S:tomcat-lib-1:10.1.36-2.el10_0.noarch",
            "AppStream-10.0.Z.E2S:tomcat-servlet-6.0-api-1:10.1.36-2.el10_0.noarch",
            "AppStream-10.0.Z.E2S:tomcat-webapps-1:10.1.36-2.el10_0.noarch"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "Apache Tomcat: Apache Tomcat: Missing Encryption of Sensitive Data due to EncryptInterceptor bypass"
    }
  ]
}



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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.