Vulnerability-Lookup

GHSA-H6FC-48RJ-7QQH

Vulnerability from github – Published: 2026-05-12 18:30 – Updated: 2026-05-18 20:38

Summary

Apache Tomcat - Digest authenticator will authenticate any unknown user

Details

Versions Affected: Apache Tomcat 11.0.0-M1 to 11.0.21 Apache Tomcat 10.1.0-M1 to 10.1.54 Apache Tomcat 9.0.0.M1 to 9.0.117 Older, unsupported versions may also be affected

Description: When DIGEST authentication was configured, any user not known to the configured Realm would be authenticated if they presented the password "null".

Mitigation: Users of the affected versions should apply one of the following mitigations: - Upgrade to Apache Tomcat 11.0.22 or later - Upgrade to Apache Tomcat 10.1.55 or later - Upgrade to Apache Tomcat 9.0.118 or later

Severity

9.8 (Critical)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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{
  "affected": [
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.apache.tomcat.embed:tomcat-embed-core"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "9.0.118"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.apache.tomcat.embed:tomcat-embed-core"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "10.1.0-M1"
            },
            {
              "fixed": "10.1.55"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.apache.tomcat.embed:tomcat-embed-core"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "11.0.0-M1"
            },
            {
              "fixed": "11.0.22"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.apache.tomcat:tomcat"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "9.0.118"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.apache.tomcat:tomcat"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "10.1.0-M1"
            },
            {
              "fixed": "10.1.55"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.apache.tomcat:tomcat"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "11.0.0-M1"
            },
            {
              "fixed": "11.0.22"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.apache.tomcat:tomcat-catalina"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "9.0.118"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.apache.tomcat:tomcat-catalina"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "10.1.0-M1"
            },
            {
              "fixed": "10.1.55"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.apache.tomcat:tomcat-catalina"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "11.0.0-M1"
            },
            {
              "fixed": "11.0.22"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-43512"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-287"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-05-18T20:38:27Z",
    "nvd_published_at": "2026-05-12T16:16:17Z",
    "severity": "CRITICAL"
  },
  "details": "Versions Affected:\nApache Tomcat 11.0.0-M1 to 11.0.21\nApache Tomcat 10.1.0-M1 to 10.1.54\nApache Tomcat 9.0.0.M1 to 9.0.117\nOlder, unsupported versions may also be affected\n\nDescription:\nWhen DIGEST authentication was configured, any user not known to the\nconfigured Realm would be authenticated if they presented the password\n\"null\".\n\nMitigation:\nUsers of the affected versions should apply one of the following\nmitigations:\n- Upgrade to Apache Tomcat 11.0.22 or later\n- Upgrade to Apache Tomcat 10.1.55 or later\n- Upgrade to Apache Tomcat 9.0.118 or later",
  "id": "GHSA-h6fc-48rj-7qqh",
  "modified": "2026-05-18T20:38:28Z",
  "published": "2026-05-12T18:30:38Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-43512"
    },
    {
      "type": "WEB",
      "url": "https://github.com/apache/tomcat/commit/3d4d3fae07a6cd9c2eb193c5491001740ec64448"
    },
    {
      "type": "WEB",
      "url": "https://github.com/apache/tomcat/commit/6565a6cb6499e56fe2f34457cec99f9d1c4f39e9"
    },
    {
      "type": "WEB",
      "url": "https://github.com/apache/tomcat/commit/a99c355e8199adbfd67c9a1fffbd85b810b196cd"
    },
    {
      "type": "WEB",
      "url": "https://lists.apache.org/thread/7x09x7o12solvclslw3sz0288xc8wx73"
    },
    {
      "type": "WEB",
      "url": "https://tomcat.apache.org/security-10.html"
    },
    {
      "type": "WEB",
      "url": "https://tomcat.apache.org/security-11.html"
    },
    {
      "type": "WEB",
      "url": "https://tomcat.apache.org/security-9.html"
    },
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2026/05/12/8"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Apache Tomcat - Digest authenticator will authenticate any unknown user"
}

CVE-2026-43512 (GCVE-0-2026-43512)

Vulnerability from cvelistv5 – Published: 2026-05-12 15:24 – Updated: 2026-05-14 19:53

Title

Apache Tomcat: Digest authenticator will authenticate any unknown user

Summary

DEPRECATED: Authentication Bypass Issues vulnerability in digest authentication in Apache Tomcat. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.21, from 10.1.0-M1 through 10.1.54, from 9.0.0.M1 through 9.0.117, from 8.5.0 through 8.5.100, from before 7.0.0. Older unsupported versions any also be affect Users are recommended to upgrade to version 11.0.22, 10.1.55 or 9.0.118 which fix the issue.

Severity

9.8 (Critical)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: yes Technical Impact: total

CISA Coordinator (v2.0.3)

CWE

CWE-592 - DEPRECATED: Authentication Bypass Issues

Assigner

apache

References

2 references

URL	Tags
https://lists.apache.org/thread/7x09x7o12solvclsl…	vendor-advisory
http://www.openwall.com/lists/oss-security/2026/05/12/8

Impacted products

1 product

Vendor	Product	Version
Apache Software Foundation	Apache Tomcat	Affected: 11.0.0-M1 , ≤ 11.0.21 (semver) Affected: 10.1.0-M1 , ≤ 10.1.54 (semver) Affected: 9.0.0.M1 , ≤ 9.0.117 (semver) Affected: 8.5.0 , ≤ 8.5.100 (semver) Affected: 7.0.0 , ≤ 7.0.109 (semver) Unknown: 0 , < 7.0.0 (semver)

Show details on NVD website

JSON

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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.

Action not permitted

GHSA-H6FC-48RJ-7QQH

CVE-2026-43512 (GCVE-0-2026-43512)

Tags

Sightings

Nomenclature