ubuntu-cve-2026-24031
Vulnerability from osv_ubuntu
Published
2026-03-27 00:00
Modified
2026-06-30 16:19
Summary
Details

Dovecot SQL based authentication can be bypassed when auth_username_chars is cleared by admin. This vulnerability allows bypassing authentication for any user and user enumeration. Do not clear auth_username_chars. If this is not possible, install latest fixed version. No publicly available exploits are known.

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

{
  "affected": [
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "dovecot-auth-lua",
            "binary_version": "1:2.4.1+dfsg1-5ubuntu4.1"
          },
          {
            "binary_name": "dovecot-core",
            "binary_version": "1:2.4.1+dfsg1-5ubuntu4.1"
          },
          {
            "binary_name": "dovecot-flatcurve",
            "binary_version": "1:2.4.1+dfsg1-5ubuntu4.1"
          },
          {
            "binary_name": "dovecot-gssapi",
            "binary_version": "1:2.4.1+dfsg1-5ubuntu4.1"
          },
          {
            "binary_name": "dovecot-imapd",
            "binary_version": "1:2.4.1+dfsg1-5ubuntu4.1"
          },
          {
            "binary_name": "dovecot-ldap",
            "binary_version": "1:2.4.1+dfsg1-5ubuntu4.1"
          },
          {
            "binary_name": "dovecot-lmtpd",
            "binary_version": "1:2.4.1+dfsg1-5ubuntu4.1"
          },
          {
            "binary_name": "dovecot-managesieved",
            "binary_version": "1:2.4.1+dfsg1-5ubuntu4.1"
          },
          {
            "binary_name": "dovecot-mysql",
            "binary_version": "1:2.4.1+dfsg1-5ubuntu4.1"
          },
          {
            "binary_name": "dovecot-pgsql",
            "binary_version": "1:2.4.1+dfsg1-5ubuntu4.1"
          },
          {
            "binary_name": "dovecot-pop3d",
            "binary_version": "1:2.4.1+dfsg1-5ubuntu4.1"
          },
          {
            "binary_name": "dovecot-sieve",
            "binary_version": "1:2.4.1+dfsg1-5ubuntu4.1"
          },
          {
            "binary_name": "dovecot-solr",
            "binary_version": "1:2.4.1+dfsg1-5ubuntu4.1"
          },
          {
            "binary_name": "dovecot-sqlite",
            "binary_version": "1:2.4.1+dfsg1-5ubuntu4.1"
          },
          {
            "binary_name": "dovecot-submissiond",
            "binary_version": "1:2.4.1+dfsg1-5ubuntu4.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "dovecot",
        "purl": "pkg:deb/ubuntu/dovecot@1:2.4.1+dfsg1-5ubuntu4.1?arch=source\u0026distro=questing"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1:2.4.1+dfsg1-5ubuntu4.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1:2.3.21.1+dfsg1-1ubuntu2",
        "1:2.4.1+dfsg1-5ubuntu1",
        "1:2.4.1+dfsg1-5ubuntu3",
        "1:2.4.1+dfsg1-5ubuntu4"
      ]
    }
  ],
  "aliases": [],
  "details": "Dovecot SQL based authentication can be bypassed when auth_username_chars is cleared by admin. This vulnerability allows bypassing authentication for any user and user enumeration. Do not clear auth_username_chars. If this is not possible, install latest fixed version. No publicly available exploits are known.",
  "id": "UBUNTU-CVE-2026-24031",
  "modified": "2026-06-30T16:19:37Z",
  "published": "2026-03-27T00:00:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-24031"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-24031"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-8136-1"
    }
  ],
  "related": [
    "USN-8136-1"
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-24031"
  ]
}



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.