RHSA-2026:92863

Vulnerability from csaf_redhat - Published: 2026-10-29 22:17 - Updated: 2026-11-02 10:51
Summary
Red Hat Security Advisory: tomcat security, bug fix, and enhancement 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): * tomcat: Apache Tomcat: Security constraint bypass due to improper access control (CVE-2026-65182) * tomcat: Apache Tomcat: Access control bypass due to off-by-one error in RewriteValve [N] flag processing (CVE-2026-65927) * tomcat: Apache Tomcat: Improper Authentication due to principal lookup failure (CVE-2026-68569) * tomcat: Apache Tomcat: Authentication bypass via limited replay attack in DIGEST authenticator (CVE-2026-65905) * tomcat: Apache Tomcat: Unauthorized resource access via FORM authentication bypass (CVE-2026-68525) * tomcat: Apache Tomcat: Denial of Service via HTTP/2 allocation leak (CVE-2026-68763) Bug Fix(es) and Enhancement(s): * Stalled TLS handshake when the server's first flight is too large [rhel-10.0] (JIRA:RHEL-279019) 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.

A flaw was found in Apache Tomcat. This improper access control and incorrect authorization vulnerability allows an attacker to bypass security constraints. This occurs when a security constraint for a longer path is specified before a more restrictive constraint for a shorter sub-path, potentially leading to unauthorized access to resources.

CWE-551 - Incorrect Behavior Order: Authorization Before Parsing and Canonicalization
Affected products
Product Identifier Version Remediation
Unresolved product id: AppStream-10.0.Z.E2S:tomcat-1:10.1.49-2.el10_0.noarch —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.0.Z.E2S:tomcat-1:10.1.49-2.el10_0.src —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.0.Z.E2S:tomcat-admin-webapps-1:10.1.49-2.el10_0.noarch —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.0.Z.E2S:tomcat-docs-webapp-1:10.1.49-2.el10_0.noarch —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.0.Z.E2S:tomcat-el-5.0-api-1:10.1.49-2.el10_0.noarch —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.0.Z.E2S:tomcat-jsp-3.1-api-1:10.1.49-2.el10_0.noarch —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.0.Z.E2S:tomcat-lib-1:10.1.49-2.el10_0.noarch —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.0.Z.E2S:tomcat-servlet-6.0-api-1:10.1.49-2.el10_0.noarch —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.0.Z.E2S:tomcat-webapps-1:10.1.49-2.el10_0.noarch —
Vendor Fix fix
Workaround
Threats
Impact Important

A flaw was found in Apache Tomcat. This vulnerability, an authentication bypass by capture-replay, affects the DIGEST authenticator. A remote attacker can exploit this by making a specially crafted DIGEST authenticated request with a nonceCount at the upper boundary of the replay window. This allows the attacker to replay the request once, potentially bypassing authentication.

CWE-294 - Authentication Bypass by Capture-replay
Affected products
Fixed 9 products, the same list as for CVE-2026-65182
Threats
Impact Moderate

A flaw was found in Apache Tomcat. An off-by-one error in the RewriteValve's [N] flag processing causes rewrite rules to restart at the second rule instead of the first. This vulnerability may allow an attacker to bypass intended access controls.

CWE-193 - Off-by-one Error
Affected products
Fixed 9 products, the same list as for CVE-2026-65182
Threats
Impact Important

A flaw was found in Apache Tomcat. This incorrect authorization vulnerability occurs within the FORM authentication process, allowing a user to bypass security constraints. This bypass enables unauthorized access to resources via a GET request, even when those resources are intended to be restricted to POST requests only.

CWE-551 - Incorrect Behavior Order: Authorization Before Parsing and Canonicalization
Affected products
Fixed 9 products, the same list as for CVE-2026-65182
Threats
Impact Moderate

A flaw was found in Apache Tomcat. This improper authentication vulnerability allows a remote attacker to be authenticated even if their user account does not exist in the DataSourceRealm, under specific circumstances such as CLIENT-CERT or SPNEGO authentication. This can lead to unauthorized access to the system.

CWE-305 - Authentication Bypass by Primary Weakness
Affected products
Fixed 9 products, the same list as for CVE-2026-65182
Threats
Impact Important

A flaw was found in Apache Tomcat. This vulnerability, an uncontrolled resource consumption issue, arises from an allocation leak in the HTTP/2 backlog tracking when a stream is reset. A remote attacker could exploit this to cause a Denial of Service (DoS), making the server unresponsive or unavailable to users.

CWE-770 - Allocation of Resources Without Limits or Throttling
Affected products
Fixed 9 products, the same list as for CVE-2026-65182
Threats
Impact Important
References
URL Category
https://access.redhat.com/errata/RHSA-2026:92863 self
https://access.redhat.com/security/updates/classi… external
https://bugzilla.redhat.com/show_bug.cgi?id=2524151 external
https://bugzilla.redhat.com/show_bug.cgi?id=2524154 external
https://bugzilla.redhat.com/show_bug.cgi?id=2524160 external
https://bugzilla.redhat.com/show_bug.cgi?id=2524161 external
https://bugzilla.redhat.com/show_bug.cgi?id=2524162 external
https://bugzilla.redhat.com/show_bug.cgi?id=2524166 external
https://issues.redhat.com/browse/RHEL-279019 external
https://security.access.redhat.com/data/csaf/v2/a… self
https://access.redhat.com/security/cve/CVE-2026-65182 self
https://bugzilla.redhat.com/show_bug.cgi?id=2524151 external
https://www.cve.org/CVERecord?id=CVE-2026-65182 external
https://nvd.nist.gov/vuln/detail/CVE-2026-65182 external
https://lists.apache.org/thread/joosxvzc9b49ttj8l… external
https://access.redhat.com/security/cve/CVE-2026-65905 self
https://bugzilla.redhat.com/show_bug.cgi?id=2524161 external
https://www.cve.org/CVERecord?id=CVE-2026-65905 external
https://nvd.nist.gov/vuln/detail/CVE-2026-65905 external
https://lists.apache.org/thread/9v114xlpgbzrrbzz5… external
https://access.redhat.com/security/cve/CVE-2026-65927 self
https://bugzilla.redhat.com/show_bug.cgi?id=2524154 external
https://www.cve.org/CVERecord?id=CVE-2026-65927 external
https://nvd.nist.gov/vuln/detail/CVE-2026-65927 external
https://lists.apache.org/thread/st1dx1zyn5y7ny2s0… external
https://access.redhat.com/security/cve/CVE-2026-68525 self
https://bugzilla.redhat.com/show_bug.cgi?id=2524162 external
https://www.cve.org/CVERecord?id=CVE-2026-68525 external
https://nvd.nist.gov/vuln/detail/CVE-2026-68525 external
https://lists.apache.org/thread/x1y2lfsgzxwzc456f… external
https://access.redhat.com/security/cve/CVE-2026-68569 self
https://bugzilla.redhat.com/show_bug.cgi?id=2524160 external
https://www.cve.org/CVERecord?id=CVE-2026-68569 external
https://nvd.nist.gov/vuln/detail/CVE-2026-68569 external
https://lists.apache.org/thread/8robqo76q0osxgw0b… external
https://access.redhat.com/security/cve/CVE-2026-68763 self
https://bugzilla.redhat.com/show_bug.cgi?id=2524166 external
https://www.cve.org/CVERecord?id=CVE-2026-68763 external
https://nvd.nist.gov/vuln/detail/CVE-2026-68763 external
https://lists.apache.org/thread/tv51ty39ppv41v04h… external

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      },
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        {
          "category": "description",
          "text": "A flaw was found in Apache Tomcat. This improper access control and incorrect authorization vulnerability allows an attacker to bypass security constraints. This occurs when a security constraint for a longer path is specified before a more restrictive constraint for a shorter sub-path, potentially leading to unauthorized access to resources.",
          "title": "Vulnerability description"
        },
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          "text": "tomcat: Apache Tomcat: Security constraint bypass due to improper access control",
          "title": "Vulnerability summary"
        },
        {
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          "text": "This Important vulnerability in Apache Tomcat allows for security constraint bypasses, potentially granting unauthorized access to protected web application resources. The flaw occurs when security constraints for longer URL paths are defined before more restrictive constraints for shorter, specific sub-paths within the application\u0027s `web.xml` configuration. This misconfiguration can undermine intended access controls in Red Hat deployments 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"
        }
      ],
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          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-65182",
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        },
        {
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            "confidentialityImpact": "HIGH",
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            "privilegesRequired": "NONE",
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      "discovery_date": "2026-08-25T22:02:01.496501+00:00",
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          "text": "A flaw was found in Apache Tomcat. This vulnerability, an authentication bypass by capture-replay, affects the DIGEST authenticator. A remote attacker can exploit this by making a specially crafted DIGEST authenticated request with a nonceCount at the upper boundary of the replay window. This allows the attacker to replay the request once, potentially bypassing authentication.",
          "title": "Vulnerability description"
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          "text": "tomcat: Apache Tomcat: Authentication bypass via limited replay attack in DIGEST authenticator",
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        },
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          "text": "This Moderate impact flaw in Apache Tomcat\u0027s DIGEST authenticator allows a limited authentication bypass through a replay attack. While the attack complexity is high, a remote attacker could potentially replay a single authenticated request if the nonceCount is at the upper boundary of the replay window, leading to limited unauthorized access. This vulnerability affects configurations utilizing DIGEST authentication.",
          "title": "Statement"
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          "title": "CVSS score applicability"
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          "title": "Vulnerability description"
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          "title": "Vulnerability summary"
        },
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          "title": "Statement"
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        {
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          "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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          "text": "tomcat: Apache Tomcat: Unauthorized resource access via FORM authentication bypass",
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          "title": "Statement"
        },
        {
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      "title": "tomcat: Apache Tomcat: Unauthorized resource access via FORM authentication bypass"
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        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-68763",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-68763"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-68763",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-68763"
        },
        {
          "category": "external",
          "summary": "https://lists.apache.org/thread/tv51ty39ppv41v04hdtkp9dp7tg02nzl",
          "url": "https://lists.apache.org/thread/tv51ty39ppv41v04hdtkp9dp7tg02nzl"
        }
      ],
      "release_date": "2026-08-25T22:00:37.047000+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-10-29T22:17:02+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-1:10.1.49-2.el10_0.noarch",
            "AppStream-10.0.Z.E2S:tomcat-1:10.1.49-2.el10_0.src",
            "AppStream-10.0.Z.E2S:tomcat-admin-webapps-1:10.1.49-2.el10_0.noarch",
            "AppStream-10.0.Z.E2S:tomcat-docs-webapp-1:10.1.49-2.el10_0.noarch",
            "AppStream-10.0.Z.E2S:tomcat-el-5.0-api-1:10.1.49-2.el10_0.noarch",
            "AppStream-10.0.Z.E2S:tomcat-jsp-3.1-api-1:10.1.49-2.el10_0.noarch",
            "AppStream-10.0.Z.E2S:tomcat-lib-1:10.1.49-2.el10_0.noarch",
            "AppStream-10.0.Z.E2S:tomcat-servlet-6.0-api-1:10.1.49-2.el10_0.noarch",
            "AppStream-10.0.Z.E2S:tomcat-webapps-1:10.1.49-2.el10_0.noarch"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:92863"
        },
        {
          "category": "workaround",
          "details": "To mitigate this vulnerability, disable the HTTP/2 protocol in Apache Tomcat if it is not required for your deployment. This can be achieved by commenting out or removing the \u003cUpgradeProtocol className=\"org.apache.coyote.http2.Http2Protocol\" /\u003e element within the \u003cConnector\u003e configuration in the server.xml file. After modifying server.xml, a restart of the Apache Tomcat service is required for the changes to take effect.",
          "product_ids": [
            "AppStream-10.0.Z.E2S:tomcat-1:10.1.49-2.el10_0.noarch",
            "AppStream-10.0.Z.E2S:tomcat-1:10.1.49-2.el10_0.src",
            "AppStream-10.0.Z.E2S:tomcat-admin-webapps-1:10.1.49-2.el10_0.noarch",
            "AppStream-10.0.Z.E2S:tomcat-docs-webapp-1:10.1.49-2.el10_0.noarch",
            "AppStream-10.0.Z.E2S:tomcat-el-5.0-api-1:10.1.49-2.el10_0.noarch",
            "AppStream-10.0.Z.E2S:tomcat-jsp-3.1-api-1:10.1.49-2.el10_0.noarch",
            "AppStream-10.0.Z.E2S:tomcat-lib-1:10.1.49-2.el10_0.noarch",
            "AppStream-10.0.Z.E2S:tomcat-servlet-6.0-api-1:10.1.49-2.el10_0.noarch",
            "AppStream-10.0.Z.E2S:tomcat-webapps-1:10.1.49-2.el10_0.noarch"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "products": [
            "AppStream-10.0.Z.E2S:tomcat-1:10.1.49-2.el10_0.noarch",
            "AppStream-10.0.Z.E2S:tomcat-1:10.1.49-2.el10_0.src",
            "AppStream-10.0.Z.E2S:tomcat-admin-webapps-1:10.1.49-2.el10_0.noarch",
            "AppStream-10.0.Z.E2S:tomcat-docs-webapp-1:10.1.49-2.el10_0.noarch",
            "AppStream-10.0.Z.E2S:tomcat-el-5.0-api-1:10.1.49-2.el10_0.noarch",
            "AppStream-10.0.Z.E2S:tomcat-jsp-3.1-api-1:10.1.49-2.el10_0.noarch",
            "AppStream-10.0.Z.E2S:tomcat-lib-1:10.1.49-2.el10_0.noarch",
            "AppStream-10.0.Z.E2S:tomcat-servlet-6.0-api-1:10.1.49-2.el10_0.noarch",
            "AppStream-10.0.Z.E2S:tomcat-webapps-1:10.1.49-2.el10_0.noarch"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "tomcat: Apache Tomcat: Denial of Service via HTTP/2 allocation leak"
    }
  ]
}



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