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DEBIAN-CVE-2026-27860

Type: advisorySource: OSV1 source record

If auth_username_chars is empty, it is possible to inject arbitrary LDAP filter to Dovecot's LDAP authentication. This leads to potentially bypassing restrictions and allows probing of LDAP structure. Do not clear out auth_username_chars, or install fixed version. No publicly available exploits are known.

Announced Source revision 1
Original source ↗

DEBIAN-CVE-2026-27860

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-2026-27860

dovecot

Source reference: /affected/0/package/name

Affected versions
1:2.4.1+dfsg1-6

Source reference: /affected/0/versions

1:2.4.1+dfsg1-6+deb13u1

Source reference: /affected/0/versions

1:2.4.1+dfsg1-6+deb13u2

Source reference: /affected/0/versions

1:2.4.1+dfsg1-6+deb13u3

Source reference: /affected/0/versions

Fixed versions
1:2.4.1+dfsg1-6+deb13u4

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+dfsg1-7

Source reference: /affected/1/versions

1:2.4.1+dfsg1-8

Source reference: /affected/1/versions

1:2.4.1+dfsg1-9

Source reference: /affected/1/versions

1:2.4.2+dfsg1-1

Source reference: /affected/1/versions

1:2.4.2+dfsg1-2

Source reference: /affected/1/versions

1:2.4.2+dfsg1-3

Source reference: /affected/1/versions

1:2.4.2+dfsg1-4

Source reference: /affected/1/versions

Fixed versions
1:2.4.3+dfsg1-1

Source reference: /affected/1/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": "1:2.4.1+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-2026-27860.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-2026-27860.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  }
]

Publisher severity

No explicit severity was provided.

Event
#56686 · Revision 1
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Publisher date
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