usn-8253-2
Vulnerability from osv_ubuntu
Published
2026-06-03 20:22
Modified
2026-06-30 15:55
Summary
postfix vulnerability
Details

USN-8253-1 fixed a vulnerability in Postfix. This update provides the corresponding fix for Postfix on Ubuntu 14.04 LTS, Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, and Ubuntu 20.04 LTS.

Original advisory details:

Kamil Frankowicz discovered that Postfix incorrectly handled certain enhanced status codes. A remote attacker could possibly use this issue to cause Postfix to crash, resulting in a denial of service.

References
To clipboard 

{
  "affected": [
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2026-43964",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:Pro:14.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "postfix",
            "binary_version": "2.11.0-1ubuntu1.2+esm4"
          },
          {
            "binary_name": "postfix-cdb",
            "binary_version": "2.11.0-1ubuntu1.2+esm4"
          },
          {
            "binary_name": "postfix-ldap",
            "binary_version": "2.11.0-1ubuntu1.2+esm4"
          },
          {
            "binary_name": "postfix-mysql",
            "binary_version": "2.11.0-1ubuntu1.2+esm4"
          },
          {
            "binary_name": "postfix-pcre",
            "binary_version": "2.11.0-1ubuntu1.2+esm4"
          },
          {
            "binary_name": "postfix-pgsql",
            "binary_version": "2.11.0-1ubuntu1.2+esm4"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:14.04:LTS",
        "name": "postfix",
        "purl": "pkg:deb/ubuntu/postfix@2.11.0-1ubuntu1.2+esm4?arch=source\u0026distro=esm-infra-legacy/trusty"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.11.0-1ubuntu1.2+esm4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.10.2-1",
        "2.10.2-1build1",
        "2.11.0-1",
        "2.11.0-1ubuntu1",
        "2.11.0-1ubuntu1.2",
        "2.11.0-1ubuntu1.2+esm2",
        "2.11.0-1ubuntu1.2+esm3"
      ]
    },
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2026-43964",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:Pro:16.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "postfix",
            "binary_version": "3.1.0-3ubuntu0.4+esm4"
          },
          {
            "binary_name": "postfix-cdb",
            "binary_version": "3.1.0-3ubuntu0.4+esm4"
          },
          {
            "binary_name": "postfix-ldap",
            "binary_version": "3.1.0-3ubuntu0.4+esm4"
          },
          {
            "binary_name": "postfix-mysql",
            "binary_version": "3.1.0-3ubuntu0.4+esm4"
          },
          {
            "binary_name": "postfix-pcre",
            "binary_version": "3.1.0-3ubuntu0.4+esm4"
          },
          {
            "binary_name": "postfix-pgsql",
            "binary_version": "3.1.0-3ubuntu0.4+esm4"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:16.04:LTS",
        "name": "postfix",
        "purl": "pkg:deb/ubuntu/postfix@3.1.0-3ubuntu0.4+esm4?arch=source\u0026distro=esm-infra-legacy/xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.1.0-3ubuntu0.4+esm4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.11.3-1ubuntu2",
        "2.11.3-1ubuntu3",
        "3.0.4-1ubuntu1",
        "3.0.4-2",
        "3.0.4-3",
        "3.0.4-5",
        "3.0.4-5build1",
        "3.1.0-3",
        "3.1.0-3ubuntu0.1",
        "3.1.0-3ubuntu0.2",
        "3.1.0-3ubuntu0.3",
        "3.1.0-3ubuntu0.4",
        "3.1.0-3ubuntu0.4+esm2",
        "3.1.0-3ubuntu0.4+esm3"
      ]
    },
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2026-43964",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:Pro:18.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "postfix",
            "binary_version": "3.3.0-1ubuntu0.4+esm4"
          },
          {
            "binary_name": "postfix-cdb",
            "binary_version": "3.3.0-1ubuntu0.4+esm4"
          },
          {
            "binary_name": "postfix-ldap",
            "binary_version": "3.3.0-1ubuntu0.4+esm4"
          },
          {
            "binary_name": "postfix-lmdb",
            "binary_version": "3.3.0-1ubuntu0.4+esm4"
          },
          {
            "binary_name": "postfix-mysql",
            "binary_version": "3.3.0-1ubuntu0.4+esm4"
          },
          {
            "binary_name": "postfix-pcre",
            "binary_version": "3.3.0-1ubuntu0.4+esm4"
          },
          {
            "binary_name": "postfix-pgsql",
            "binary_version": "3.3.0-1ubuntu0.4+esm4"
          },
          {
            "binary_name": "postfix-sqlite",
            "binary_version": "3.3.0-1ubuntu0.4+esm4"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:18.04:LTS",
        "name": "postfix",
        "purl": "pkg:deb/ubuntu/postfix@3.3.0-1ubuntu0.4+esm4?arch=source\u0026distro=esm-infra/bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.3.0-1ubuntu0.4+esm4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.2.3-1",
        "3.2.3-1build1",
        "3.2.4-1",
        "3.2.5-1",
        "3.2.5-1build1",
        "3.3.0-1",
        "3.3.0-1ubuntu0.1",
        "3.3.0-1ubuntu0.2",
        "3.3.0-1ubuntu0.3",
        "3.3.0-1ubuntu0.4",
        "3.3.0-1ubuntu0.4+esm2",
        "3.3.0-1ubuntu0.4+esm3"
      ]
    },
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2026-43964",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:Pro:20.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "postfix",
            "binary_version": "3.4.13-0ubuntu1.4+esm1"
          },
          {
            "binary_name": "postfix-cdb",
            "binary_version": "3.4.13-0ubuntu1.4+esm1"
          },
          {
            "binary_name": "postfix-ldap",
            "binary_version": "3.4.13-0ubuntu1.4+esm1"
          },
          {
            "binary_name": "postfix-lmdb",
            "binary_version": "3.4.13-0ubuntu1.4+esm1"
          },
          {
            "binary_name": "postfix-mysql",
            "binary_version": "3.4.13-0ubuntu1.4+esm1"
          },
          {
            "binary_name": "postfix-pcre",
            "binary_version": "3.4.13-0ubuntu1.4+esm1"
          },
          {
            "binary_name": "postfix-pgsql",
            "binary_version": "3.4.13-0ubuntu1.4+esm1"
          },
          {
            "binary_name": "postfix-sqlite",
            "binary_version": "3.4.13-0ubuntu1.4+esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:20.04:LTS",
        "name": "postfix",
        "purl": "pkg:deb/ubuntu/postfix@3.4.13-0ubuntu1.4+esm1?arch=source\u0026distro=esm-infra/focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.4.13-0ubuntu1.4+esm1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.4.5-1ubuntu1",
        "3.4.7-1",
        "3.4.7-2",
        "3.4.8-1",
        "3.4.9-1",
        "3.4.10-1",
        "3.4.10-1ubuntu1",
        "3.4.13-0ubuntu1",
        "3.4.13-0ubuntu1.1",
        "3.4.13-0ubuntu1.2",
        "3.4.13-0ubuntu1.3",
        "3.4.13-0ubuntu1.4"
      ]
    }
  ],
  "aliases": [],
  "details": "USN-8253-1 fixed a vulnerability in Postfix. This update provides the\ncorresponding fix for Postfix on Ubuntu 14.04 LTS, Ubuntu 16.04 LTS,\nUbuntu 18.04 LTS, and Ubuntu 20.04 LTS.\n\nOriginal advisory details:\n\n Kamil Frankowicz discovered that Postfix incorrectly handled certain\n enhanced status codes. A remote attacker could possibly use this issue to\n cause Postfix to crash, resulting in a denial of service.",
  "id": "USN-8253-2",
  "modified": "2026-06-30T15:55:18Z",
  "published": "2026-06-03T20:22:56Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-8253-2"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-43964"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "postfix vulnerability",
  "upstream": [
    "UBUNTU-CVE-2026-43964"
  ]
}



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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

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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.