{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "cpe": "cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*",
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "9.0.101"
              },
              {
                "introduced": "10.1.0"
              },
              {
                "fixed": "10.1.37"
              },
              {
                "introduced": "11.0.0"
              },
              {
                "fixed": "11.0.5"
              }
            ],
            "source": "CPE_RANGE"
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "cf9caee37dd3d2dbb0294983e921c12a318c1f5e"
            },
            {
              "introduced": "e9d17cddc285615807ec5fef09240777436b25dc"
            },
            {
              "fixed": "e4338ee7a3e0f22d85f7cb2e04dacee752eaa619"
            },
            {
              "introduced": "56e547d387ab49f688c93fe9ca082b1b5d94deed"
            },
            {
              "fixed": "1ba1f9061e49ce03c77b57beff3d50e5c2c3ee29"
            }
          ],
          "repo": "https://github.com/apache/tomcat",
          "type": "GIT"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "apache",
    "cwe_ids": [
      "CWE-304"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55957.json",
    "unresolved_ranges": [
      {
        "extracted_events": [
          {
            "introduced": "11.0.0-M1"
          },
          {
            "last_affected": "11.0.4"
          },
          {
            "introduced": "10.1.0-M1"
          },
          {
            "last_affected": "10.1.36"
          },
          {
            "introduced": "9.0.0.M1"
          },
          {
            "last_affected": "9.0.100"
          },
          {
            "introduced": "8.5.0"
          },
          {
            "last_affected": "8.5.100"
          },
          {
            "introduced": "7.0.0"
          },
          {
            "last_affected": "7.0.109"
          }
        ],
        "source": "AFFECTED_FIELD"
      },
      {
        "extracted_events": [
          {
            "introduced": "11.0.0-M1"
          },
          {
            "fixed": "11.0.4"
          },
          {
            "introduced": "10.1.0-M1"
          },
          {
            "fixed": "10.1.36"
          },
          {
            "introduced": "9.0.0.M1"
          },
          {
            "fixed": "9.0.100"
          },
          {
            "introduced": "8.5.0"
          },
          {
            "fixed": "8.5.100"
          },
          {
            "introduced": "7.0.0"
          },
          {
            "fixed": "7.0.109"
          }
        ],
        "source": "DESCRIPTION"
      }
    ]
  },
  "details": "Missing Critical Step in Authentication vulnerability in Apache Tomcat when the JNDIRealm was configured to authenticate binds using GSSAPI allowed attackers to authenticate without provided the correct password.\n\nThis issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.4, from 10.1.0-M1 through 10.1.36, from 9.0.0.M1 through 9.0.100, from 8.5.0 through 8.5.100, from 7.0.0 through 7.0.109.\n\nUsers are recommended to upgrade to version 11.0.5, 10.1.37 or 9.0.101, which fixes the issue.",
  "id": "CVE-2026-55957",
  "modified": "2026-07-08T05:36:44.671147220Z",
  "published": "2026-06-29T20:47:12.661Z",
  "references": [
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2026/06/29/26"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55957.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://lists.apache.org/thread/7fk339o5jvd4mcgsf0chbrn4o525ccjh"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-55957"
    }
  ],
  "schema_version": "1.7.5",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Apache Tomcat: Authentication bypass with JNDIRealm and GSSAPI authenticated bind"
}