RHSA-2026:18536

Vulnerability from csaf_redhat - Published: 2026-05-19 09:00 - Updated: 2026-09-28 15:20
Summary
Red Hat Security Advisory: tomcat9 security update
Severity
Important
Notes
Topic: An update for tomcat9 is now available for Red Hat Enterprise Linux 10. 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: 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): * tomcat: Apache Tomcat: Security constraint bypass for CGI scripts (CVE-2025-46701) * org.apache.tomcat/tomcat-catalina: tomcat: Apache Tomcat: session fixation via rewrite valve (CVE-2025-55668) * org.apache.tomcat/tomcat-juli: tomcat: Apache Tomcat: console manipulation (CVE-2025-55754) 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. Additional Changes: For detailed information on changes in this release, see the Red Hat Enterprise Linux 10 Release Notes linked from 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 vulnerability was found in Apache Tomcat. When processing an HTTP/2 stream, Tomcat did not handle some cases of excessive HTTP headers correctly. This issue led to a miscounting of active HTTP/2 streams, which in turn led to using an incorrect infinite timeout that allowed connections to remain open that should have been closed.

CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')
Affected products
Product Identifier Version Remediation
Unresolved product id: AppStream-10.2.GA:tomcat9-1:9.0.110-2.el10_2.noarch —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.2.GA:tomcat9-1:9.0.110-2.el10_2.src —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.2.GA:tomcat9-admin-webapps-1:9.0.110-2.el10_2.noarch —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.2.GA:tomcat9-docs-webapp-1:9.0.110-2.el10_2.noarch —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.2.GA:tomcat9-el-3.0-api-1:9.0.110-2.el10_2.noarch —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.2.GA:tomcat9-jsp-2.3-api-1:9.0.110-2.el10_2.noarch —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.2.GA:tomcat9-lib-1:9.0.110-2.el10_2.noarch —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.2.GA:tomcat9-servlet-4.0-api-1:9.0.110-2.el10_2.noarch —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.2.GA:tomcat9-webapps-1:9.0.110-2.el10_2.noarch —
Vendor Fix fix
Workaround
Threats
Impact Important

A vulnerability was found in Tomcat. Under certain configurations on any platform, this flaw allows an attacker to cause an OutOfMemoryError by abusing the TLS handshake process.

CWE-400 - Uncontrolled Resource Consumption
Affected products
Fixed 9 products, the same list as for CVE-2024-34750
Threats
Impact Important

A flaw was found in the CGI servlet component of Apache Tomcat. This vulnerability allows a security constraint bypass via improper handling of case sensitivity in the pathInfo component of a URI mapped to the CGI servlet.

CWE-178 - Improper Handling of Case Sensitivity
Affected products
Fixed 9 products, the same list as for CVE-2024-34750
Threats
Impact Moderate

A session fixation vulnerability has been identified in Apache Tomcat, affecting its rewrite functionality. If the rewrite valve is enabled for a web application, an attacker can craft a specific URL. If a victim clicks on this malicious URL, their subsequent interaction with the resource will occur within the context of the attacker's session. This could allow an attacker to hijack the victim's session and perform actions on their behalf.

CWE-384 - Session Fixation
Affected products
Fixed 9 products, the same list as for CVE-2024-34750
Threats
Impact Moderate

An improper input neutralization flaw has been discovered in Apache Tomcat. Tomcat did not escape ANSI escape sequences in log messages. If Tomcat was running in a console on a Windows operating system, and the console supported ANSI escape sequences, it was possible for an attacker to use a specially crafted URL to inject ANSI escape sequences to manipulate the console and the clipboard and attempt to trick an administrator into running an attacker controlled command. While no attack vector was found, it may have been possible to mount this attack on other operating systems.

CWE-150 - Improper Neutralization of Escape, Meta, or Control Sequences
Affected products
Fixed 9 products, the same list as for CVE-2024-34750
Threats
Impact Moderate

A denial of service flaw has been discovered in Apache Tomcat. If an error occurred (including exceeding limits) during the processing of a multipart upload, temporary copies of the uploaded parts written to disc were not cleaned up immediately but left for the garbage collection process to delete. Depending on JVM settings, application memory usage and application load, it was possible that space for the temporary copies of uploaded parts would be filled faster than GC cleared it, leading to a DoS.

CWE-404 - Improper Resource Shutdown or Release
Affected products
Fixed 9 products, the same list as for CVE-2024-34750
Threats
Impact Moderate

A flaw was found in Apache Tomcat. When the JNDIRealm was configured to authenticate binds using GSSAPI, an attacker could exploit a missing critical step in the authentication process. This allowed the attacker to bypass password verification and authenticate without providing the correct password, leading to unauthorized access.

CWE-305 - Authentication Bypass by Primary Weakness
Affected products
Fixed 9 products, the same list as for CVE-2024-34750
Threats
Impact Important
References
URL Category
https://access.redhat.com/errata/RHSA-2026:18536 self
https://docs.redhat.com/en/documentation/red_hat_… external
https://access.redhat.com/security/updates/classi… external
https://bugzilla.redhat.com/show_bug.cgi?id=2369253 external
https://bugzilla.redhat.com/show_bug.cgi?id=2388226 external
https://bugzilla.redhat.com/show_bug.cgi?id=2406590 external
https://issues.redhat.com/browse/RHEL-148687 external
https://issues.redhat.com/browse/RHEL-158962 external
https://security.access.redhat.com/data/csaf/v2/a… self
https://access.redhat.com/security/cve/CVE-2024-34750 self
https://bugzilla.redhat.com/show_bug.cgi?id=2295651 external
https://www.cve.org/CVERecord?id=CVE-2024-34750 external
https://nvd.nist.gov/vuln/detail/CVE-2024-34750 external
https://lists.apache.org/thread/4kqf0bc9gxymjc2x7… external
https://access.redhat.com/security/cve/CVE-2024-38286 self
https://bugzilla.redhat.com/show_bug.cgi?id=2314686 external
https://www.cve.org/CVERecord?id=CVE-2024-38286 external
https://nvd.nist.gov/vuln/detail/CVE-2024-38286 external
https://lists.apache.org/thread/wms60cvbsz3fpbz9p… external
https://access.redhat.com/security/cve/CVE-2025-46701 self
https://bugzilla.redhat.com/show_bug.cgi?id=2369253 external
https://www.cve.org/CVERecord?id=CVE-2025-46701 external
https://nvd.nist.gov/vuln/detail/CVE-2025-46701 external
https://lists.apache.org/thread/xhqqk9w5q45srcdqh… external
https://access.redhat.com/security/cve/CVE-2025-55668 self
https://bugzilla.redhat.com/show_bug.cgi?id=2388226 external
https://www.cve.org/CVERecord?id=CVE-2025-55668 external
https://nvd.nist.gov/vuln/detail/CVE-2025-55668 external
https://github.com/apache/tomcat/commit/8621e4c6b… external
https://github.com/apache/tomcat/commit/90306d971… external
https://github.com/apache/tomcat/commit/9c3673ba0… external
https://lists.apache.org/thread/v6bknr96rl7l1qxkl… external
https://access.redhat.com/security/cve/CVE-2025-55754 self
https://bugzilla.redhat.com/show_bug.cgi?id=2406590 external
https://www.cve.org/CVERecord?id=CVE-2025-55754 external
https://nvd.nist.gov/vuln/detail/CVE-2025-55754 external
https://github.com/apache/tomcat/commit/5a3db0929… external
https://lists.apache.org/thread/j7w54hqbkfcn0xb9x… external
https://access.redhat.com/security/cve/CVE-2025-61795 self
https://bugzilla.redhat.com/show_bug.cgi?id=2406588 external
https://www.cve.org/CVERecord?id=CVE-2025-61795 external
https://nvd.nist.gov/vuln/detail/CVE-2025-61795 external
https://github.com/apache/tomcat/commit/1cdf5f730… external
https://lists.apache.org/thread/wm9mx8brmx9g4zpyw… external
https://access.redhat.com/security/cve/CVE-2026-55957 self
https://bugzilla.redhat.com/show_bug.cgi?id=2494669 external
https://www.cve.org/CVERecord?id=CVE-2026-55957 external
https://nvd.nist.gov/vuln/detail/CVE-2026-55957 external
https://lists.apache.org/thread/7fk339o5jvd4mcgsf… external

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      "title": "org.apache.tomcat/tomcat-catalina: tomcat: Apache Tomcat: session fixation via rewrite valve"
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          "title": "Vulnerability summary"
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          "category": "external",
          "summary": "https://github.com/apache/tomcat/commit/1cdf5f730ede75a0759492f179ac21ca4ff68e06",
          "url": "https://github.com/apache/tomcat/commit/1cdf5f730ede75a0759492f179ac21ca4ff68e06"
        },
        {
          "category": "external",
          "summary": "https://lists.apache.org/thread/wm9mx8brmx9g4zpywm06ryrtvd3160pp",
          "url": "https://lists.apache.org/thread/wm9mx8brmx9g4zpywm06ryrtvd3160pp"
        }
      ],
      "release_date": "2025-10-27T17:30:28.334000+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-05-19T09:00:26+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-10.2.GA:tomcat9-1:9.0.110-2.el10_2.noarch",
            "AppStream-10.2.GA:tomcat9-1:9.0.110-2.el10_2.src",
            "AppStream-10.2.GA:tomcat9-admin-webapps-1:9.0.110-2.el10_2.noarch",
            "AppStream-10.2.GA:tomcat9-docs-webapp-1:9.0.110-2.el10_2.noarch",
            "AppStream-10.2.GA:tomcat9-el-3.0-api-1:9.0.110-2.el10_2.noarch",
            "AppStream-10.2.GA:tomcat9-jsp-2.3-api-1:9.0.110-2.el10_2.noarch",
            "AppStream-10.2.GA:tomcat9-lib-1:9.0.110-2.el10_2.noarch",
            "AppStream-10.2.GA:tomcat9-servlet-4.0-api-1:9.0.110-2.el10_2.noarch",
            "AppStream-10.2.GA:tomcat9-webapps-1:9.0.110-2.el10_2.noarch"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:18536"
        },
        {
          "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-10.2.GA:tomcat9-1:9.0.110-2.el10_2.noarch",
            "AppStream-10.2.GA:tomcat9-1:9.0.110-2.el10_2.src",
            "AppStream-10.2.GA:tomcat9-admin-webapps-1:9.0.110-2.el10_2.noarch",
            "AppStream-10.2.GA:tomcat9-docs-webapp-1:9.0.110-2.el10_2.noarch",
            "AppStream-10.2.GA:tomcat9-el-3.0-api-1:9.0.110-2.el10_2.noarch",
            "AppStream-10.2.GA:tomcat9-jsp-2.3-api-1:9.0.110-2.el10_2.noarch",
            "AppStream-10.2.GA:tomcat9-lib-1:9.0.110-2.el10_2.noarch",
            "AppStream-10.2.GA:tomcat9-servlet-4.0-api-1:9.0.110-2.el10_2.noarch",
            "AppStream-10.2.GA:tomcat9-webapps-1:9.0.110-2.el10_2.noarch"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "products": [
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            "AppStream-10.2.GA:tomcat9-docs-webapp-1:9.0.110-2.el10_2.noarch",
            "AppStream-10.2.GA:tomcat9-el-3.0-api-1:9.0.110-2.el10_2.noarch",
            "AppStream-10.2.GA:tomcat9-jsp-2.3-api-1:9.0.110-2.el10_2.noarch",
            "AppStream-10.2.GA:tomcat9-lib-1:9.0.110-2.el10_2.noarch",
            "AppStream-10.2.GA:tomcat9-servlet-4.0-api-1:9.0.110-2.el10_2.noarch",
            "AppStream-10.2.GA:tomcat9-webapps-1:9.0.110-2.el10_2.noarch"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "tomcat: org.apache.tomcat/tomcat-catalina: Apache Tomcat: Denial of service"
    },
    {
      "cve": "CVE-2026-55957",
      "cwe": {
        "id": "CWE-305",
        "name": "Authentication Bypass by Primary Weakness"
      },
      "discovery_date": "2026-06-29T21:01:13.605887+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2494669"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in Apache Tomcat. When the JNDIRealm was configured to authenticate binds using GSSAPI, an attacker could exploit a missing critical step in the authentication process. This allowed the attacker to bypass password verification and authenticate without providing the correct password, leading to unauthorized access.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "tomcat: Apache Tomcat: Authentication bypass via missing critical step in JNDIRealm GSSAPI configuration",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This issue is rated as Important severity because it allows an attacker to fully bypass password verification when authenticating against a Tomcat instance, potentially gaining unauthorized access to protected resources without any privileges or user interaction required.",
          "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-10.2.GA:tomcat9-1:9.0.110-2.el10_2.noarch",
          "AppStream-10.2.GA:tomcat9-1:9.0.110-2.el10_2.src",
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          "AppStream-10.2.GA:tomcat9-docs-webapp-1:9.0.110-2.el10_2.noarch",
          "AppStream-10.2.GA:tomcat9-el-3.0-api-1:9.0.110-2.el10_2.noarch",
          "AppStream-10.2.GA:tomcat9-jsp-2.3-api-1:9.0.110-2.el10_2.noarch",
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          "AppStream-10.2.GA:tomcat9-servlet-4.0-api-1:9.0.110-2.el10_2.noarch",
          "AppStream-10.2.GA:tomcat9-webapps-1:9.0.110-2.el10_2.noarch"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-55957"
        },
        {
          "category": "external",
          "summary": "RHBZ#2494669",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2494669"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-55957",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-55957"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-55957",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-55957"
        },
        {
          "category": "external",
          "summary": "https://lists.apache.org/thread/7fk339o5jvd4mcgsf0chbrn4o525ccjh",
          "url": "https://lists.apache.org/thread/7fk339o5jvd4mcgsf0chbrn4o525ccjh"
        }
      ],
      "release_date": "2026-06-29T20:47:12.661000+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-05-19T09:00:26+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-10.2.GA:tomcat9-1:9.0.110-2.el10_2.noarch",
            "AppStream-10.2.GA:tomcat9-1:9.0.110-2.el10_2.src",
            "AppStream-10.2.GA:tomcat9-admin-webapps-1:9.0.110-2.el10_2.noarch",
            "AppStream-10.2.GA:tomcat9-docs-webapp-1:9.0.110-2.el10_2.noarch",
            "AppStream-10.2.GA:tomcat9-el-3.0-api-1:9.0.110-2.el10_2.noarch",
            "AppStream-10.2.GA:tomcat9-jsp-2.3-api-1:9.0.110-2.el10_2.noarch",
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            "AppStream-10.2.GA:tomcat9-webapps-1:9.0.110-2.el10_2.noarch"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:18536"
        },
        {
          "category": "workaround",
          "details": "Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible.",
          "product_ids": [
            "AppStream-10.2.GA:tomcat9-1:9.0.110-2.el10_2.noarch",
            "AppStream-10.2.GA:tomcat9-1:9.0.110-2.el10_2.src",
            "AppStream-10.2.GA:tomcat9-admin-webapps-1:9.0.110-2.el10_2.noarch",
            "AppStream-10.2.GA:tomcat9-docs-webapp-1:9.0.110-2.el10_2.noarch",
            "AppStream-10.2.GA:tomcat9-el-3.0-api-1:9.0.110-2.el10_2.noarch",
            "AppStream-10.2.GA:tomcat9-jsp-2.3-api-1:9.0.110-2.el10_2.noarch",
            "AppStream-10.2.GA:tomcat9-lib-1:9.0.110-2.el10_2.noarch",
            "AppStream-10.2.GA:tomcat9-servlet-4.0-api-1:9.0.110-2.el10_2.noarch",
            "AppStream-10.2.GA:tomcat9-webapps-1:9.0.110-2.el10_2.noarch"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "LOW",
            "baseScore": 7.3,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "LOW",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L",
            "version": "3.1"
          },
          "products": [
            "AppStream-10.2.GA:tomcat9-1:9.0.110-2.el10_2.noarch",
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            "AppStream-10.2.GA:tomcat9-admin-webapps-1:9.0.110-2.el10_2.noarch",
            "AppStream-10.2.GA:tomcat9-docs-webapp-1:9.0.110-2.el10_2.noarch",
            "AppStream-10.2.GA:tomcat9-el-3.0-api-1:9.0.110-2.el10_2.noarch",
            "AppStream-10.2.GA:tomcat9-jsp-2.3-api-1:9.0.110-2.el10_2.noarch",
            "AppStream-10.2.GA:tomcat9-lib-1:9.0.110-2.el10_2.noarch",
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            "AppStream-10.2.GA:tomcat9-webapps-1:9.0.110-2.el10_2.noarch"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "tomcat: Apache Tomcat: Authentication bypass via missing critical step in JNDIRealm GSSAPI configuration"
    }
  ]
}



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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

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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.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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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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