usn-8136-2
Vulnerability from osv_ubuntu
Published
2026-04-28 12:52
Modified
2026-04-28 12:52
Summary
dovecot regression
Details

USN-8136-1 fixed vulnerabilities in Dovecot. The update caused a regression on Ubuntu 22.04 LTS and Ubuntu 24.04 LTS. This update fixes the problem.

We apologize for the inconvenience.

Original advisory details:

It was discovered that Dovecot incorrectly handled invalid base64 SASL data. An attacker could possibly use this issue to cause a denial of service. This issue only affected Ubuntu 25.10. (CVE-2025-59028)

It was discovered that Dovecot script decode2text.sh incorrectly handled zip files. An attacker could possibly use this issue to obtain sensitive information. (CVE-2025-59031)

It was discovered that Dovecot incorrectly handled certain AUTHENTICATE requests. An attacker could possibly use this issue to cause a denial of service. (CVE-2025-59032)

It was discovered that Dovecot incorrectly handled certain SQL based authentication. An attacker could possibly use this issue to bypass authentication. This issue only affected Ubuntu 25.10. (CVE-2026-24031)

It was discovered that Dovecot incorrectly handled certain LDAP based authentication. An attacker could possibly use this issue to bypass restrictions and allow probing of LDAP structure. This issue only affected Ubuntu 25.10. (CVE-2026-27860)

It was discovered that Dovecot is vulnerable to replay attack under certain conditions. An attacker could possibly use this issue to bypass authentication. (CVE-2026-27855)

It was discovered that Dovecot is vulnerable to a timing attack under certain conditions. An attacker could possibly use this issue to bypass authentication. (CVE-2026-27856)

It was discovered that Dovecot incorrectly handled certain IMAP login requests. An attacker could possibly use this issue to cause a denial of service. (CVE-2026-27857)

It was discovered that Dovecot incorrectly handled certain specially crafted messages. An attacker could possibly use this issue to cause a denial of service. (CVE-2026-27858)

It was discovered that Dovecot incorrectly handled certain specially crafted mail messages. An attacker could possibly use this issue to cause a denial of service. (CVE-2026-27859)

It was discovered that Dovecot incorrectly handles file paths. A attacker could possibly use this issue to perform a path traversal and obtain or modify arbitrary files. This issue only affected Ubuntu 22.04 LTS and Ubuntu 24.04 LTS. (CVE-2026-0394)

References
To clipboard 

{
  "affected": [
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2026-0394",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:22.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "dovecot-auth-lua",
            "binary_version": "1:2.3.16+dfsg1-3ubuntu2.8"
          },
          {
            "binary_name": "dovecot-core",
            "binary_version": "1:2.3.16+dfsg1-3ubuntu2.8"
          },
          {
            "binary_name": "dovecot-gssapi",
            "binary_version": "1:2.3.16+dfsg1-3ubuntu2.8"
          },
          {
            "binary_name": "dovecot-imapd",
            "binary_version": "1:2.3.16+dfsg1-3ubuntu2.8"
          },
          {
            "binary_name": "dovecot-ldap",
            "binary_version": "1:2.3.16+dfsg1-3ubuntu2.8"
          },
          {
            "binary_name": "dovecot-lmtpd",
            "binary_version": "1:2.3.16+dfsg1-3ubuntu2.8"
          },
          {
            "binary_name": "dovecot-lucene",
            "binary_version": "1:2.3.16+dfsg1-3ubuntu2.8"
          },
          {
            "binary_name": "dovecot-managesieved",
            "binary_version": "1:2.3.16+dfsg1-3ubuntu2.8"
          },
          {
            "binary_name": "dovecot-mysql",
            "binary_version": "1:2.3.16+dfsg1-3ubuntu2.8"
          },
          {
            "binary_name": "dovecot-pgsql",
            "binary_version": "1:2.3.16+dfsg1-3ubuntu2.8"
          },
          {
            "binary_name": "dovecot-pop3d",
            "binary_version": "1:2.3.16+dfsg1-3ubuntu2.8"
          },
          {
            "binary_name": "dovecot-sieve",
            "binary_version": "1:2.3.16+dfsg1-3ubuntu2.8"
          },
          {
            "binary_name": "dovecot-solr",
            "binary_version": "1:2.3.16+dfsg1-3ubuntu2.8"
          },
          {
            "binary_name": "dovecot-sqlite",
            "binary_version": "1:2.3.16+dfsg1-3ubuntu2.8"
          },
          {
            "binary_name": "dovecot-submissiond",
            "binary_version": "1:2.3.16+dfsg1-3ubuntu2.8"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "dovecot",
        "purl": "pkg:deb/ubuntu/dovecot@1:2.3.16+dfsg1-3ubuntu2.8?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1:2.3.16+dfsg1-3ubuntu2.8"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1:2.3.13+dfsg1-1ubuntu3",
        "1:2.3.16+dfsg1-3ubuntu1",
        "1:2.3.16+dfsg1-3ubuntu2",
        "1:2.3.16+dfsg1-3ubuntu2.1",
        "1:2.3.16+dfsg1-3ubuntu2.2",
        "1:2.3.16+dfsg1-3ubuntu2.4",
        "1:2.3.16+dfsg1-3ubuntu2.6",
        "1:2.3.16+dfsg1-3ubuntu2.7"
      ]
    },
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2026-0394",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:24.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "dovecot-auth-lua",
            "binary_version": "1:2.3.21+dfsg1-2ubuntu6.4"
          },
          {
            "binary_name": "dovecot-core",
            "binary_version": "1:2.3.21+dfsg1-2ubuntu6.4"
          },
          {
            "binary_name": "dovecot-gssapi",
            "binary_version": "1:2.3.21+dfsg1-2ubuntu6.4"
          },
          {
            "binary_name": "dovecot-imapd",
            "binary_version": "1:2.3.21+dfsg1-2ubuntu6.4"
          },
          {
            "binary_name": "dovecot-ldap",
            "binary_version": "1:2.3.21+dfsg1-2ubuntu6.4"
          },
          {
            "binary_name": "dovecot-lmtpd",
            "binary_version": "1:2.3.21+dfsg1-2ubuntu6.4"
          },
          {
            "binary_name": "dovecot-managesieved",
            "binary_version": "1:2.3.21+dfsg1-2ubuntu6.4"
          },
          {
            "binary_name": "dovecot-mysql",
            "binary_version": "1:2.3.21+dfsg1-2ubuntu6.4"
          },
          {
            "binary_name": "dovecot-pgsql",
            "binary_version": "1:2.3.21+dfsg1-2ubuntu6.4"
          },
          {
            "binary_name": "dovecot-pop3d",
            "binary_version": "1:2.3.21+dfsg1-2ubuntu6.4"
          },
          {
            "binary_name": "dovecot-sieve",
            "binary_version": "1:2.3.21+dfsg1-2ubuntu6.4"
          },
          {
            "binary_name": "dovecot-solr",
            "binary_version": "1:2.3.21+dfsg1-2ubuntu6.4"
          },
          {
            "binary_name": "dovecot-sqlite",
            "binary_version": "1:2.3.21+dfsg1-2ubuntu6.4"
          },
          {
            "binary_name": "dovecot-submissiond",
            "binary_version": "1:2.3.21+dfsg1-2ubuntu6.4"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "dovecot",
        "purl": "pkg:deb/ubuntu/dovecot@1:2.3.21+dfsg1-2ubuntu6.4?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1:2.3.21+dfsg1-2ubuntu6.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1:2.3.20+dfsg1-1ubuntu3",
        "1:2.3.21+dfsg1-2ubuntu1",
        "1:2.3.21+dfsg1-2ubuntu2",
        "1:2.3.21+dfsg1-2ubuntu4",
        "1:2.3.21+dfsg1-2ubuntu5",
        "1:2.3.21+dfsg1-2ubuntu6",
        "1:2.3.21+dfsg1-2ubuntu6.1",
        "1:2.3.21+dfsg1-2ubuntu6.2",
        "1:2.3.21+dfsg1-2ubuntu6.3"
      ]
    }
  ],
  "aliases": [],
  "details": "USN-8136-1 fixed vulnerabilities in Dovecot. The update caused a regression\non Ubuntu 22.04 LTS and Ubuntu 24.04 LTS. This update fixes the problem.\n\nWe apologize for the inconvenience.\n\nOriginal advisory details:\n\n It was discovered that Dovecot incorrectly handled invalid base64 SASL data.\n An attacker could possibly use this issue to cause a denial of service. This\n issue only affected Ubuntu 25.10. (CVE-2025-59028)\n\n It was discovered that Dovecot script decode2text.sh incorrectly handled zip\n files. An attacker could possibly use this issue to obtain sensitive\n information. (CVE-2025-59031)\n\n It was discovered that Dovecot incorrectly handled certain AUTHENTICATE\n requests. An attacker could possibly use this issue to cause a denial of\n service. (CVE-2025-59032)\n\n It was discovered that Dovecot incorrectly handled certain SQL based\n authentication. An attacker could possibly use this issue to bypass\n authentication. This issue only affected Ubuntu 25.10. (CVE-2026-24031)\n\n It was discovered that Dovecot incorrectly handled certain LDAP based\n authentication. An attacker could possibly use this issue to bypass\n restrictions and allow probing of LDAP structure. This issue only affected\n Ubuntu 25.10. (CVE-2026-27860)\n\n It was discovered that Dovecot is vulnerable to replay attack under\n certain conditions. An attacker could possibly use this issue to bypass\n authentication. (CVE-2026-27855)\n\n It was discovered that Dovecot is vulnerable to a timing attack under\n certain conditions. An attacker could possibly use this issue to bypass\n authentication. (CVE-2026-27856)\n\n It was discovered that Dovecot incorrectly handled certain IMAP login\n requests. An attacker could possibly use this issue to cause a denial of\n service. (CVE-2026-27857)\n\n It was discovered that Dovecot incorrectly handled certain specially\n crafted messages. An attacker could possibly use this issue to cause a\n denial of service. (CVE-2026-27858)\n\n It was discovered that Dovecot incorrectly handled certain specially\n crafted mail messages. An attacker could possibly use this issue to\n cause a denial of service. (CVE-2026-27859)\n\n It was discovered that Dovecot incorrectly handles file paths. A attacker\n could possibly use this issue to perform a path traversal and obtain or\n modify arbitrary files. This issue only affected Ubuntu 22.04 LTS and\n Ubuntu 24.04 LTS. (CVE-2026-0394)",
  "id": "USN-8136-2",
  "modified": "2026-04-28T12:52:01Z",
  "published": "2026-04-28T12:52:01Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-8136-2"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-0394"
    },
    {
      "type": "REPORT",
      "url": "https://launchpad.net/bugs/2150116"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "dovecot regression",
  "upstream": [
    "UBUNTU-CVE-2026-0394"
  ]
}



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.