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DEBIAN-CVE-2026-27859

Type: advisorySource: OSV1 source record

A mail message containing excessive amount of RFC 2231 MIME parameters causes LMTP to use too much CPU. A suitably formatted mail message causes mail delivery process to consume large amounts of CPU time. Use MTA capabilities to limit RFC 2231 MIME parameters in mail messages, or upgrade to fixed version where the processing is limited. No publicly available exploits are known.

Announced Source revision 1
Original source ↗

DEBIAN-CVE-2026-27859

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-2026-27859

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

Fixed versions
1:2.3.19.1+dfsg1-2.1+deb12u2

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

Fixed versions
1:2.4.1+dfsg1-6+deb13u4

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

Fixed versions
1:2.4.3+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+deb12u2"
          }
        ]
      }
    ],
    "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"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-27859.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "1:2.4.1+dfsg1-6+deb13u4"
          }
        ]
      }
    ],
    "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"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-27859.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "1:2.4.3+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"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-27859.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  }
]

Publisher severity

No explicit severity was provided.

Event
#56306 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement