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DEBIAN-CVE-2026-40684

Type: advisorySource: OSV1 source record

In Exim before 4.99.2, on systems using musl libc (not glibc), an attacker can crash the connection instance when malformed DNS data is present in PTR records. This is caused by a dn_expand oddity in octal printing.

Announced Group revision 1
Original source ↗

DEBIAN-CVE-2026-40684

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-2026-40684

exim4

Source reference: /affected/0/package/name

Affected versions
4.96-15

Source reference: /affected/0/versions

4.96-15+deb12u1

Source reference: /affected/0/versions

4.96-15+deb12u2

Source reference: /affected/0/versions

4.96-15+deb12u3

Source reference: /affected/0/versions

4.96-15+deb12u4

Source reference: /affected/0/versions

4.96-15+deb12u5

Source reference: /affected/0/versions

4.96-15+deb12u6

Source reference: /affected/0/versions

4.96-15+deb12u7

Source reference: /affected/0/versions

4.96-15+deb12u8

Source reference: /affected/0/versions

Fixed versions
4.96-15+deb12u9

Source reference: /affected/0/ranges

Prerequisites
Not stated in this record

exim4

Source reference: /affected/1/package/name

Affected versions
4.98.2-1

Source reference: /affected/1/versions

4.98.2-1+deb13u1

Source reference: /affected/1/versions

Fixed versions
4.98.2-1+deb13u2

Source reference: /affected/1/ranges

Prerequisites
Not stated in this record

exim4

Source reference: /affected/2/package/name

Affected versions
4.98.2-1

Source reference: /affected/2/versions

4.98.2-1+hurd.1

Source reference: /affected/2/versions

4.98.2-2

Source reference: /affected/2/versions

4.99-1

Source reference: /affected/2/versions

4.99-2

Source reference: /affected/2/versions

4.99-3

Source reference: /affected/2/versions

4.99-4

Source reference: /affected/2/versions

4.99-4~bpo13+1

Source reference: /affected/2/versions

4.99-5

Source reference: /affected/2/versions

4.99-6

Source reference: /affected/2/versions

4.99-6~bpo13+1

Source reference: /affected/2/versions

4.99-7

Source reference: /affected/2/versions

4.99-7~bpo13+1

Source reference: /affected/2/versions

4.99.1-1

Source reference: /affected/2/versions

4.99.1-1~bpo13+1

Source reference: /affected/2/versions

4.99.1-2

Source reference: /affected/2/versions

4.99.1-3

Source reference: /affected/2/versions

4.99.1-4

Source reference: /affected/2/versions

4.99.1-5

Source reference: /affected/2/versions

4.99.1-6

Source reference: /affected/2/versions

4.99.2-1~bpo13+1

Source reference: /affected/2/versions

4.99~RC1-1

Source reference: /affected/2/versions

4.99~RC2-1

Source reference: /affected/2/versions

4.99~RC3-1

Source reference: /affected/2/versions

4.99~RC3-2

Source reference: /affected/2/versions

Fixed versions
4.99.2-1

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": "4.96-15+deb12u9"
          }
        ]
      }
    ],
    "package": {
      "name": "exim4",
      "purl": "pkg:deb/debian/exim4?arch=source&distro=bookworm",
      "ecosystem": "Debian:12"
    },
    "versions": [
      "4.96-15",
      "4.96-15+deb12u1",
      "4.96-15+deb12u2",
      "4.96-15+deb12u3",
      "4.96-15+deb12u4",
      "4.96-15+deb12u5",
      "4.96-15+deb12u6",
      "4.96-15+deb12u7",
      "4.96-15+deb12u8"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-40684.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "4.98.2-1+deb13u2"
          }
        ]
      }
    ],
    "package": {
      "name": "exim4",
      "purl": "pkg:deb/debian/exim4?arch=source&distro=trixie",
      "ecosystem": "Debian:13"
    },
    "versions": [
      "4.98.2-1",
      "4.98.2-1+deb13u1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-40684.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "4.99.2-1"
          }
        ]
      }
    ],
    "package": {
      "name": "exim4",
      "purl": "pkg:deb/debian/exim4?arch=source&distro=forky",
      "ecosystem": "Debian:14"
    },
    "versions": [
      "4.98.2-1",
      "4.98.2-1+hurd.1",
      "4.98.2-2",
      "4.99-1",
      "4.99-2",
      "4.99-3",
      "4.99-4",
      "4.99-4~bpo13+1",
      "4.99-5",
      "4.99-6",
      "4.99-6~bpo13+1",
      "4.99-7",
      "4.99-7~bpo13+1",
      "4.99.1-1",
      "4.99.1-1~bpo13+1",
      "4.99.1-2",
      "4.99.1-3",
      "4.99.1-4",
      "4.99.1-5",
      "4.99.1-6",
      "4.99.2-1~bpo13+1",
      "4.99~RC1-1",
      "4.99~RC2-1",
      "4.99~RC3-1",
      "4.99~RC3-2"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-40684.json"
    },
    "ecosystem_specific": {
      "urgency": "unimportant"
    }
  }
]

Publisher severity

No explicit severity was provided.

Event
#56462 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement

Revision history

  1. DEBIAN-CVE-2026-40684 · Revision 1Source updated