ubuntu-cve-2026-34500
Vulnerability from osv_ubuntu
Published
2026-04-09 20:16
Modified
2026-07-09 19:34
Summary
Details

CLIENT_CERT authentication does not fail as expected for some scenarios when soft fail is disabled and FFM is used in Apache Tomcat. This issue affects Apache Tomcat: from 11.0.0-M14 through 11.0.20, from 10.1.22 through 10.1.53, from 9.0.92 through 9.0.116. Users are recommended to upgrade to version 11.0.21, 10.1.54 or 9.0.117, which fixes the issue.

Severity
6.5 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N
N/A (UNKNOWN)
medium
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libtomcat10-embed-java",
            "binary_version": "10.1.40-1ubuntu1.25.10.1"
          },
          {
            "binary_name": "libtomcat10-java",
            "binary_version": "10.1.40-1ubuntu1.25.10.1"
          },
          {
            "binary_name": "tomcat10",
            "binary_version": "10.1.40-1ubuntu1.25.10.1"
          },
          {
            "binary_name": "tomcat10-admin",
            "binary_version": "10.1.40-1ubuntu1.25.10.1"
          },
          {
            "binary_name": "tomcat10-common",
            "binary_version": "10.1.40-1ubuntu1.25.10.1"
          },
          {
            "binary_name": "tomcat10-docs",
            "binary_version": "10.1.40-1ubuntu1.25.10.1"
          },
          {
            "binary_name": "tomcat10-examples",
            "binary_version": "10.1.40-1ubuntu1.25.10.1"
          },
          {
            "binary_name": "tomcat10-user",
            "binary_version": "10.1.40-1ubuntu1.25.10.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "tomcat10",
        "purl": "pkg:deb/ubuntu/tomcat10@10.1.40-1ubuntu1.25.10.1?arch=source\u0026distro=questing"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "10.1.35-1",
        "10.1.40-1",
        "10.1.40-1ubuntu1",
        "10.1.40-1ubuntu1.25.10.1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libtomcat11-embed-java",
            "binary_version": "11.0.6-1"
          },
          {
            "binary_name": "libtomcat11-java",
            "binary_version": "11.0.6-1"
          },
          {
            "binary_name": "tomcat11",
            "binary_version": "11.0.6-1"
          },
          {
            "binary_name": "tomcat11-admin",
            "binary_version": "11.0.6-1"
          },
          {
            "binary_name": "tomcat11-common",
            "binary_version": "11.0.6-1"
          },
          {
            "binary_name": "tomcat11-docs",
            "binary_version": "11.0.6-1"
          },
          {
            "binary_name": "tomcat11-examples",
            "binary_version": "11.0.6-1"
          },
          {
            "binary_name": "tomcat11-user",
            "binary_version": "11.0.6-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "tomcat11",
        "purl": "pkg:deb/ubuntu/tomcat11@11.0.6-1?arch=source\u0026distro=questing"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "11.0.6-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libtomcat9-java",
            "binary_version": "9.0.95-1ubuntu1.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "tomcat9",
        "purl": "pkg:deb/ubuntu/tomcat9@9.0.95-1ubuntu1.1?arch=source\u0026distro=questing"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "9.0.70-2ubuntu1.1",
        "9.0.70-2ubuntu2",
        "9.0.70-2ubuntu3",
        "9.0.95-1ubuntu1",
        "9.0.95-1ubuntu1.1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libtomcat10-embed-java",
            "binary_version": "10.1.55-1ubuntu2~26.04.1"
          },
          {
            "binary_name": "libtomcat10-java",
            "binary_version": "10.1.55-1ubuntu2~26.04.1"
          },
          {
            "binary_name": "tomcat10",
            "binary_version": "10.1.55-1ubuntu2~26.04.1"
          },
          {
            "binary_name": "tomcat10-admin",
            "binary_version": "10.1.55-1ubuntu2~26.04.1"
          },
          {
            "binary_name": "tomcat10-common",
            "binary_version": "10.1.55-1ubuntu2~26.04.1"
          },
          {
            "binary_name": "tomcat10-docs",
            "binary_version": "10.1.55-1ubuntu2~26.04.1"
          },
          {
            "binary_name": "tomcat10-examples",
            "binary_version": "10.1.55-1ubuntu2~26.04.1"
          },
          {
            "binary_name": "tomcat10-user",
            "binary_version": "10.1.55-1ubuntu2~26.04.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "tomcat10",
        "purl": "pkg:deb/ubuntu/tomcat10@10.1.55-1ubuntu2~26.04.1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "10.1.40-1ubuntu1",
        "10.1.40-1ubuntu1.26.04.1",
        "10.1.55-1ubuntu2~26.04.1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libtomcat9-java",
            "binary_version": "9.0.118-1~26.04.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "tomcat9",
        "purl": "pkg:deb/ubuntu/tomcat9@9.0.118-1~26.04.1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "9.0.95-1ubuntu1",
        "9.0.111-1",
        "9.0.115-1",
        "9.0.115-1ubuntu0.1",
        "9.0.118-1~26.04.1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libtomcat11-embed-java",
            "binary_version": "11.0.22-2ubuntu2~26.04.1"
          },
          {
            "binary_name": "libtomcat11-java",
            "binary_version": "11.0.22-2ubuntu2~26.04.1"
          },
          {
            "binary_name": "tomcat11",
            "binary_version": "11.0.22-2ubuntu2~26.04.1"
          },
          {
            "binary_name": "tomcat11-admin",
            "binary_version": "11.0.22-2ubuntu2~26.04.1"
          },
          {
            "binary_name": "tomcat11-common",
            "binary_version": "11.0.22-2ubuntu2~26.04.1"
          },
          {
            "binary_name": "tomcat11-docs",
            "binary_version": "11.0.22-2ubuntu2~26.04.1"
          },
          {
            "binary_name": "tomcat11-examples",
            "binary_version": "11.0.22-2ubuntu2~26.04.1"
          },
          {
            "binary_name": "tomcat11-user",
            "binary_version": "11.0.22-2ubuntu2~26.04.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "tomcat11",
        "purl": "pkg:deb/ubuntu/tomcat11@11.0.22-2ubuntu2~26.04.1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "11.0.6-1",
        "11.0.11-1",
        "11.0.15-1",
        "11.0.18-1",
        "11.0.18-1ubuntu0.1~esm1",
        "11.0.22-2ubuntu2~26.04.1"
      ]
    }
  ],
  "aliases": [],
  "details": "CLIENT_CERT authentication does not fail as expected for some scenarios when soft fail is disabled and FFM is used in Apache Tomcat. This issue affects Apache Tomcat: from 11.0.0-M14 through 11.0.20, from 10.1.22 through 10.1.53, from 9.0.92 through 9.0.116. Users are recommended to upgrade to version 11.0.21, 10.1.54 or 9.0.117, which fixes the issue.",
  "id": "UBUNTU-CVE-2026-34500",
  "modified": "2026-07-09T19:34:22Z",
  "published": "2026-04-09T20:16:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-34500"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-34500"
    },
    {
      "type": "REPORT",
      "url": "https://lists.apache.org/thread/7rcl4zdxryc8hy3htyfyxkbqpxjtfdl2"
    },
    {
      "type": "REPORT",
      "url": "http://www.openwall.com/lists/oss-security/2026/04/09/29"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-34500"
  ]
}



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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

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.