RHSA-2026:16528

Vulnerability from csaf_redhat - Published: 2026-05-12 20:44 - Updated: 2026-06-16 21:45
Summary
Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update
Severity
Moderate
Notes
Topic: An update for Red Hat Hardened Images RPMs is now available.
Details: This update includes the following RPMs: tomcat10: * tomcat10-10.1.55-1.hum1 (noarch) * tomcat10-admin-webapps-10.1.55-1.hum1 (noarch) * tomcat10-common-10.1.55-1.hum1 (noarch) * tomcat10-docs-webapp-10.1.55-1.hum1 (noarch) * tomcat10-el-5.0-api-10.1.55-1.hum1 (noarch) * tomcat10-jsp-3.1-api-10.1.55-1.hum1 (noarch) * tomcat10-lib-10.1.55-1.hum1 (noarch) * tomcat10-servlet-6.0-api-10.1.55-1.hum1 (noarch) * tomcat10-user-instance-10.1.55-1.hum1 (noarch) * tomcat10-webapps-10.1.55-1.hum1 (noarch) * tomcat10-10.1.55-1.hum1.src (src)
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-2026-42498

A flaw was found in Apache Tomcat. During WebSocket authentication, the HTTP Authentication Header can be exposed to unexpected hosts. This vulnerability leads to information disclosure, potentially allowing an attacker to gain access to sensitive authentication credentials.

6.5 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
CWE-201 - Insertion of Sensitive Information Into Sent Data
Affected products
Product Identifier Version Remediation
Unresolved product id: Red Hat Hardened Images:tomcat10-main@noarch —
Vendor Fix fix
Unresolved product id: Red Hat Hardened Images:tomcat10-main@src —
Vendor Fix fix
Threats
Impact Moderate
CVE-2026-43512

A flaw was found in Apache Tomcat. When DIGEST authentication was configured, any user not known to the configured Realm would be authenticated if they presented the password "null". This allows a remote attacker to bypass security controls.

6.5 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
CWE-303 - Incorrect Implementation of Authentication Algorithm
Affected products
Product Identifier Version Remediation
Unresolved product id: Red Hat Hardened Images:tomcat10-main@noarch —
Vendor Fix fix
Workaround
Unresolved product id: Red Hat Hardened Images:tomcat10-main@src —
Vendor Fix fix
Workaround
Threats
Impact Moderate
CVE-2026-43514

A flaw was found in Apache Tomcat. The AJP secret was comparable in non-constant time, allowing an attacker on the local network to mount a timing attack to determine the AJP secret, which may lead to unauthorized access or other security bypasses.

3.7 (Low)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
CWE-208 - Observable Timing Discrepancy
Affected products
Product Identifier Version Remediation
Unresolved product id: Red Hat Hardened Images:tomcat10-main@noarch —
Vendor Fix fix
Unresolved product id: Red Hat Hardened Images:tomcat10-main@src —
Vendor Fix fix
Threats
Impact Low
References
To clipboard 

{
  "document": {
    "aggregate_severity": {
      "namespace": "https://access.redhat.com/security/updates/classification/",
      "text": "Moderate"
    },
    "category": "csaf_security_advisory",
    "csaf_version": "2.0",
    "distribution": {
      "text": "Copyright \u00a9 Red Hat, Inc. All rights reserved.",
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "en",
    "notes": [
      {
        "category": "summary",
        "text": "An update for Red Hat Hardened Images RPMs is now available.",
        "title": "Topic"
      },
      {
        "category": "general",
        "text": "This update includes the following RPMs:\n\ntomcat10:\n  * tomcat10-10.1.55-1.hum1 (noarch)\n  * tomcat10-admin-webapps-10.1.55-1.hum1 (noarch)\n  * tomcat10-common-10.1.55-1.hum1 (noarch)\n  * tomcat10-docs-webapp-10.1.55-1.hum1 (noarch)\n  * tomcat10-el-5.0-api-10.1.55-1.hum1 (noarch)\n  * tomcat10-jsp-3.1-api-10.1.55-1.hum1 (noarch)\n  * tomcat10-lib-10.1.55-1.hum1 (noarch)\n  * tomcat10-servlet-6.0-api-10.1.55-1.hum1 (noarch)\n  * tomcat10-user-instance-10.1.55-1.hum1 (noarch)\n  * tomcat10-webapps-10.1.55-1.hum1 (noarch)\n  * tomcat10-10.1.55-1.hum1.src (src)",
        "title": "Details"
      },
      {
        "category": "legal_disclaimer",
        "text": "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.",
        "title": "Terms of Use"
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "https://access.redhat.com/security/team/contact/",
      "issuing_authority": "Red Hat Product Security is responsible for vulnerability handling across all Red Hat products and services.",
      "name": "Red Hat Product Security",
      "namespace": "https://www.redhat.com"
    },
    "references": [
      {
        "category": "self",
        "summary": "https://access.redhat.com/errata/RHSA-2026:16528",
        "url": "https://access.redhat.com/errata/RHSA-2026:16528"
      },
      {
        "category": "external",
        "summary": "https://images.redhat.com/",
        "url": "https://images.redhat.com/"
      },
      {
        "category": "external",
        "summary": "https://access.redhat.com/security/cve/CVE-2026-43512",
        "url": "https://access.redhat.com/security/cve/CVE-2026-43512"
      },
      {
        "category": "external",
        "summary": "https://access.redhat.com/security/updates/classification/",
        "url": "https://access.redhat.com/security/updates/classification/"
      },
      {
        "category": "external",
        "summary": "https://access.redhat.com/security/cve/CVE-2026-43515",
        "url": "https://access.redhat.com/security/cve/CVE-2026-43515"
      },
      {
        "category": "external",
        "summary": "https://access.redhat.com/security/cve/CVE-2026-42498",
        "url": "https://access.redhat.com/security/cve/CVE-2026-42498"
      },
      {
        "category": "external",
        "summary": "https://access.redhat.com/security/cve/CVE-2026-43514",
        "url": "https://access.redhat.com/security/cve/CVE-2026-43514"
      },
      {
        "category": "self",
        "summary": "Canonical URL",
        "url": "https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_16528.json"
      }
    ],
    "title": "Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update",
    "tracking": {
      "current_release_date": "2026-06-16T21:45:16+00:00",
      "generator": {
        "date": "2026-06-16T21:45:16+00:00",
        "engine": {
          "name": "Red Hat SDEngine",
          "version": "5.0.0"
        }
      },
      "id": "RHSA-2026:16528",
      "initial_release_date": "2026-05-12T20:44:29+00:00",
      "revision_history": [
        {
          "date": "2026-05-12T20:44:29+00:00",
          "number": "1",
          "summary": "Initial version"
        },
        {
          "date": "2026-06-16T12:31:56+00:00",
          "number": "2",
          "summary": "Last updated version"
        },
        {
          "date": "2026-06-16T21:45:16+00:00",
          "number": "3",
          "summary": "Last generated version"
        }
      ],
      "status": "final",
      "version": "3"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_name",
                "name": "Red Hat Hardened Images",
                "product": {
                  "name": "Red Hat Hardened Images",
                  "product_id": "Red Hat Hardened Images",
                  "product_identification_helper": {
                    "cpe": "cpe:/a:redhat:hummingbird:1"
                  }
                }
              }
            ],
            "category": "product_family",
            "name": "Red Hat Hardened Images"
          },
          {
            "branches": [
              {
                "category": "product_version",
                "name": "tomcat10-main@noarch",
                "product": {
                  "name": "tomcat10-main@noarch",
                  "product_id": "tomcat10-main@noarch",
                  "product_identification_helper": {
                    "purl": "pkg:rpm/redhat/tomcat10@10.1.55-1.hum1?arch=noarch\u0026distro=hummingbird-20251124\u0026repository_id=public-hummingbird-x86_64-rpms"
                  }
                }
              }
            ],
            "category": "architecture",
            "name": "noarch"
          },
          {
            "branches": [
              {
                "category": "product_version",
                "name": "tomcat10-main@src",
                "product": {
                  "name": "tomcat10-main@src",
                  "product_id": "tomcat10-main@src",
                  "product_identification_helper": {
                    "purl": "pkg:rpm/redhat/tomcat10@10.1.55-1.hum1?arch=src\u0026distro=hummingbird-20251124\u0026repository_id=public-hummingbird-source-rpms"
                  }
                }
              }
            ],
            "category": "architecture",
            "name": "src"
          }
        ],
        "category": "vendor",
        "name": "Red Hat"
      }
    ],
    "relationships": [
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "tomcat10-main@noarch as a component of Red Hat Hardened Images",
          "product_id": "Red Hat Hardened Images:tomcat10-main@noarch"
        },
        "product_reference": "tomcat10-main@noarch",
        "relates_to_product_reference": "Red Hat Hardened Images"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "tomcat10-main@src as a component of Red Hat Hardened Images",
          "product_id": "Red Hat Hardened Images:tomcat10-main@src"
        },
        "product_reference": "tomcat10-main@src",
        "relates_to_product_reference": "Red Hat Hardened Images"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-42498",
      "cwe": {
        "id": "CWE-201",
        "name": "Insertion of Sensitive Information Into Sent Data"
      },
      "discovery_date": "2026-05-12T16:01:38.872167+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2476516"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in Apache Tomcat. During WebSocket authentication, the HTTP Authentication Header can be exposed to unexpected hosts. This vulnerability leads to information disclosure, potentially allowing an attacker to gain access to sensitive authentication credentials.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "tomcat-coyote: Apache Tomcat: Information disclosure due to HTTP Authentication Header exposure during WebSocket authentication.",
          "title": "Vulnerability summary"
        },
        {
          "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": [
          "Red Hat Hardened Images:tomcat10-main@noarch",
          "Red Hat Hardened Images:tomcat10-main@src"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-42498"
        },
        {
          "category": "external",
          "summary": "RHBZ#2476516",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2476516"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-42498",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-42498"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-42498",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-42498"
        },
        {
          "category": "external",
          "summary": "https://lists.apache.org/thread/n61zwf75jrv09rz90j4jssncm244bwdb",
          "url": "https://lists.apache.org/thread/n61zwf75jrv09rz90j4jssncm244bwdb"
        }
      ],
      "release_date": "2026-05-12T15:17:56.531000+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-05-12T20:44:29+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\nhttps://images.redhat.com/",
          "product_ids": [
            "Red Hat Hardened Images:tomcat10-main@noarch",
            "Red Hat Hardened Images:tomcat10-main@src"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:16528"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 6.5,
            "baseSeverity": "MEDIUM",
            "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:N",
            "version": "3.1"
          },
          "products": [
            "Red Hat Hardened Images:tomcat10-main@noarch",
            "Red Hat Hardened Images:tomcat10-main@src"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "tomcat-coyote: Apache Tomcat: Information disclosure due to HTTP Authentication Header exposure during WebSocket authentication."
    },
    {
      "cve": "CVE-2026-43512",
      "cwe": {
        "id": "CWE-303",
        "name": "Incorrect Implementation of Authentication Algorithm"
      },
      "discovery_date": "2026-05-12T16:01:26.008892+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2476511"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in Apache Tomcat. When DIGEST authentication was configured, any user not known to the configured Realm would be authenticated if they presented the password \"null\". This allows a remote attacker to bypass security controls.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "tomcat-coyote: Apache Tomcat: Authentication bypass via digest authentication",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This Moderate flaw in Apache Tomcat allows an authentication bypass when DIGEST authentication is configured. An attacker can authenticate as any unknown user by providing the password \u0027null\u0027, potentially gaining unauthorized access to applications protected by DIGEST authentication. Red Hat products are only affected if they are configured to use DIGEST authentication, which is not a common, out of the box and expected configuration for Production environments. \n\nFurthermore, because the unknown user is not mapped to any valid realm roles, their access is still restricted by standard application authorization constraints, significantly limiting the actual impact.\n\nThe unknown user is not mapped to any existing user, which means, it does not steal credentials nor impersonate an existing user. This new user is expected to have the minimum possible authentication and authorization range within the realm inherited roles.",
          "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": [
          "Red Hat Hardened Images:tomcat10-main@noarch",
          "Red Hat Hardened Images:tomcat10-main@src"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-43512"
        },
        {
          "category": "external",
          "summary": "RHBZ#2476511",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2476511"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-43512",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-43512"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-43512",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-43512"
        },
        {
          "category": "external",
          "summary": "https://lists.apache.org/thread/7x09x7o12solvclslw3sz0288xc8wx73",
          "url": "https://lists.apache.org/thread/7x09x7o12solvclslw3sz0288xc8wx73"
        }
      ],
      "release_date": "2026-05-12T15:24:02.424000+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-05-12T20:44:29+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\nhttps://images.redhat.com/",
          "product_ids": [
            "Red Hat Hardened Images:tomcat10-main@noarch",
            "Red Hat Hardened Images:tomcat10-main@src"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:16528"
        },
        {
          "category": "workaround",
          "details": "To mitigate this issue, disable DIGEST authentication within Apache Tomcat if it is not essential for your environment. This involves modifying the server\u0027s authentication configuration to utilize alternative methods or remove the DIGEST realm. A service restart is required for these changes to take effect and may impact functionality relying on DIGEST authentication.",
          "product_ids": [
            "Red Hat Hardened Images:tomcat10-main@noarch",
            "Red Hat Hardened Images:tomcat10-main@src"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 6.5,
            "baseSeverity": "MEDIUM",
            "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:N",
            "version": "3.1"
          },
          "products": [
            "Red Hat Hardened Images:tomcat10-main@noarch",
            "Red Hat Hardened Images:tomcat10-main@src"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "tomcat-coyote: Apache Tomcat: Authentication bypass via digest authentication"
    },
    {
      "cve": "CVE-2026-43514",
      "cwe": {
        "id": "CWE-208",
        "name": "Observable Timing Discrepancy"
      },
      "discovery_date": "2026-05-12T16:01:28.665836+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2476512"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in Apache Tomcat. The AJP secret was comparable in non-constant time, allowing an attacker on the local network to mount a timing attack to determine the AJP secret, which may lead to unauthorized access or other security bypasses.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "tomcat-coyote: Apache Tomcat: Information disclosure via AJP secret timing discrepancy",
          "title": "Vulnerability summary"
        },
        {
          "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": [
          "Red Hat Hardened Images:tomcat10-main@noarch",
          "Red Hat Hardened Images:tomcat10-main@src"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-43514"
        },
        {
          "category": "external",
          "summary": "RHBZ#2476512",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2476512"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-43514",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-43514"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-43514",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-43514"
        },
        {
          "category": "external",
          "summary": "https://lists.apache.org/thread/2k654v5cq123npfsd1b2kk1y30owqb1m",
          "url": "https://lists.apache.org/thread/2k654v5cq123npfsd1b2kk1y30owqb1m"
        }
      ],
      "release_date": "2026-05-12T15:32:09.858000+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-05-12T20:44:29+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\nhttps://images.redhat.com/",
          "product_ids": [
            "Red Hat Hardened Images:tomcat10-main@noarch",
            "Red Hat Hardened Images:tomcat10-main@src"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:16528"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 3.7,
            "baseSeverity": "LOW",
            "confidentialityImpact": "LOW",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N",
            "version": "3.1"
          },
          "products": [
            "Red Hat Hardened Images:tomcat10-main@noarch",
            "Red Hat Hardened Images:tomcat10-main@src"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Low"
        }
      ],
      "title": "tomcat-coyote: Apache Tomcat: Information disclosure via AJP secret timing discrepancy"
    }
  ]
}


Log in or create an account to share your comment.




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.