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DEBIAN-CVE-2026-40020

Type: advisorySource: OSV1 source record

Attacker can use the IMAP SETACL command to inject the anyone permission to user's dovecot-acl file even if imap_acl_allow_anyone=no. This causes folders to be spammed to all users. The impact is limited to being able to spam folders to other users, no unexpected access is gained. Install to fixed version. No publicly available exploits are known.

Announced Group revision 1
Original source ↗

DEBIAN-CVE-2026-40020

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: osv:DEBIAN-CVE-2026-40020

dovecot

Source reference: /affected/0/package/name

Affected versions
1:2.3.19.1+dfsg1-2.1

Source reference: /affected/0/versions

1:2.3.19.1+dfsg1-2.1+deb12u1

Source reference: /affected/0/versions

1:2.3.19.1+dfsg1-2.1+deb12u2

Source reference: /affected/0/versions

1:2.3.19.1+dfsg1-2.1+deb12u3

Source reference: /affected/0/versions

1:2.3.19.1+dfsg1-2.1+deb12u4

Source reference: /affected/0/versions

1:2.3.19.1+dfsg1-2.1+deb12u5

Source reference: /affected/0/versions

Fixed versions
1:2.3.19.1+dfsg1-2.1+deb12u6

Source reference: /affected/0/ranges

Prerequisites
Not stated in this record

dovecot

Source reference: /affected/1/package/name

Affected versions
1:2.4.1+dfsg1-6

Source reference: /affected/1/versions

1:2.4.1+dfsg1-6+deb13u1

Source reference: /affected/1/versions

1:2.4.1+dfsg1-6+deb13u2

Source reference: /affected/1/versions

1:2.4.1+dfsg1-6+deb13u3

Source reference: /affected/1/versions

1:2.4.1+dfsg1-6+deb13u4

Source reference: /affected/1/versions

1:2.4.1+dfsg1-6+deb13u5

Source reference: /affected/1/versions

Fixed versions
1:2.4.1+dfsg1-6+deb13u6

Source reference: /affected/1/ranges

Prerequisites
Not stated in this record

dovecot

Source reference: /affected/2/package/name

Affected versions
1:2.4.1+dfsg1-6

Source reference: /affected/2/versions

1:2.4.1+dfsg1-7

Source reference: /affected/2/versions

1:2.4.1+dfsg1-8

Source reference: /affected/2/versions

1:2.4.1+dfsg1-9

Source reference: /affected/2/versions

1:2.4.2+dfsg1-1

Source reference: /affected/2/versions

1:2.4.2+dfsg1-2

Source reference: /affected/2/versions

1:2.4.2+dfsg1-3

Source reference: /affected/2/versions

1:2.4.2+dfsg1-4

Source reference: /affected/2/versions

1:2.4.3+dfsg1-1

Source reference: /affected/2/versions

1:2.4.3+dfsg1-2

Source reference: /affected/2/versions

Fixed versions
1:2.4.4+dfsg1-1

Source reference: /affected/2/ranges

Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "1:2.3.19.1+dfsg1-2.1+deb12u6"
          }
        ]
      }
    ],
    "package": {
      "name": "dovecot",
      "purl": "pkg:deb/debian/dovecot?arch=source&distro=bookworm",
      "ecosystem": "Debian:12"
    },
    "versions": [
      "1:2.3.19.1+dfsg1-2.1",
      "1:2.3.19.1+dfsg1-2.1+deb12u1",
      "1:2.3.19.1+dfsg1-2.1+deb12u2",
      "1:2.3.19.1+dfsg1-2.1+deb12u3",
      "1:2.3.19.1+dfsg1-2.1+deb12u4",
      "1:2.3.19.1+dfsg1-2.1+deb12u5"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-40020.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "1:2.4.1+dfsg1-6+deb13u6"
          }
        ]
      }
    ],
    "package": {
      "name": "dovecot",
      "purl": "pkg:deb/debian/dovecot?arch=source&distro=trixie",
      "ecosystem": "Debian:13"
    },
    "versions": [
      "1:2.4.1+dfsg1-6",
      "1:2.4.1+dfsg1-6+deb13u1",
      "1:2.4.1+dfsg1-6+deb13u2",
      "1:2.4.1+dfsg1-6+deb13u3",
      "1:2.4.1+dfsg1-6+deb13u4",
      "1:2.4.1+dfsg1-6+deb13u5"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-40020.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "1:2.4.4+dfsg1-1"
          }
        ]
      }
    ],
    "package": {
      "name": "dovecot",
      "purl": "pkg:deb/debian/dovecot?arch=source&distro=forky",
      "ecosystem": "Debian:14"
    },
    "versions": [
      "1:2.4.1+dfsg1-6",
      "1:2.4.1+dfsg1-7",
      "1:2.4.1+dfsg1-8",
      "1:2.4.1+dfsg1-9",
      "1:2.4.2+dfsg1-1",
      "1:2.4.2+dfsg1-2",
      "1:2.4.2+dfsg1-3",
      "1:2.4.2+dfsg1-4",
      "1:2.4.3+dfsg1-1",
      "1:2.4.3+dfsg1-2"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-40020.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  }
]

Publisher severity

No explicit severity was provided.

Event
#56417 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement

Revision history

  1. DEBIAN-CVE-2026-40020 · Revision 1Source updated