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DEBIAN-CVE-2026-40685

Type: advisorySource: OSV1 source record

In Exim before 4.99.2, when JSON lookup is enabled, an out-of-bounds heap write can occur when a JSON operator encounters malformed JSON in an untrusted header, because of an incorrect implementation of \ skipping.

Announced Group revision 1
Original source ↗

DEBIAN-CVE-2026-40685

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-2026-40685

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-2026-40685.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-2026-40685.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-2026-40685.json"
    },
    "ecosystem_specific": {
      "urgency": "unimportant"
    }
  }
]

Publisher severity

No explicit severity was provided.

Event
#56464 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement

Revision history

  1. DEBIAN-CVE-2026-40685 · Revision 1Source updated