UnratedFix available

DEBIAN-CVE-2026-48840

Type: advisorySource: OSV1 source record

Exim 4.88 before 4.99.4, in some proxy configurations, mishandles certain short payloads, leading to disclosure of uninitialized stack memory values to a client.

Announced 30 May 2026Source revision 1

Original source ↗

DEBIAN-CVE-2026-48840

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-2026-48840

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
4.96-15+deb12u9
Source reference: /affected/0/versions
Fixed versions: 4.96-15+deb12u10
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
4.98.2-1+deb13u2
Source reference: /affected/1/versions
Fixed versions: 4.98.2-1+deb13u3
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
Source reference: /affected/2/versions
4.99.2-1~bpo13+1
Source reference: /affected/2/versions
4.99.2-2
Source reference: /affected/2/versions
4.99.2-2~bpo13+1
Source reference: /affected/2/versions
4.99.3-1
Source reference: /affected/2/versions
4.99.3-2~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: 4.99.3-2
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+deb12u10"
          }
        ]
      }
    ],
    "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",
      "4.96-15+deb12u9"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-48840.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "4.98.2-1+deb13u3"
          }
        ]
      }
    ],
    "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",
      "4.98.2-1+deb13u2"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-48840.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "4.99.3-2"
          }
        ]
      }
    ],
    "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",
      "4.99.2-1~bpo13+1",
      "4.99.2-2",
      "4.99.2-2~bpo13+1",
      "4.99.3-1",
      "4.99.3-2~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-2026-48840.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  }
]

Publisher severity

No explicit severity was provided.

Event: #57187 · Revision 1
Added to Heist Feed: Sun, 25 Oct 2026 17:04:55 GMT
Publisher date: Sat, 30 May 2026 02:16:19 GMT

Read the original announcement