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DEBIAN-CVE-2026-40019

Type: advisorySource: OSV1 source record

An unauthenticated attacker can send a truncated quoted argument to the ManageSieve login process, which makes it spin in an infinite loop consuming CPU. This can cause degradation or denial of service for Sieve script management, and repeated connections can consume all available CPU on the server. Monitor system for abnormal CPU usage and kill the offending process. Restrict network access to the ManageSieve service to trusted clients. Update to non-vulnerable version. No publicly available exploits are known.

Announced Source revision 1
Original source ↗

DEBIAN-CVE-2026-40019

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-2026-40019

dovecot

Source reference: /affected/0/package/name

Affected versions
1:2.4.1+dfsg1-6

Source reference: /affected/0/versions

1:2.4.1+dfsg1-7

Source reference: /affected/0/versions

1:2.4.1+dfsg1-8

Source reference: /affected/0/versions

1:2.4.1+dfsg1-9

Source reference: /affected/0/versions

1:2.4.2+dfsg1-1

Source reference: /affected/0/versions

1:2.4.2+dfsg1-2

Source reference: /affected/0/versions

1:2.4.2+dfsg1-3

Source reference: /affected/0/versions

1:2.4.2+dfsg1-4

Source reference: /affected/0/versions

1:2.4.3+dfsg1-1

Source reference: /affected/0/versions

1:2.4.3+dfsg1-2

Source reference: /affected/0/versions

1:2.4.4+dfsg1-1

Source reference: /affected/0/versions

1:2.4.4+dfsg1-2

Source reference: /affected/0/versions

Fixed versions
1:2.4.5+dfsg1-1

Source reference: /affected/0/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": "1:2.4.5+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",
      "1:2.4.4+dfsg1-1",
      "1:2.4.4+dfsg1-2"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-40019.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  }
]

Publisher severity

No explicit severity was provided.

Event
#56412 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement