UnratedFix available

UBUNTU-CVE-2026-94054

Type: advisorySource: OSV1 source record

Exim before 4.100.1, when Proxy-Protocol is used with an attacker-controlled proxy, has an out-of-bounds write.

Announced 19 Sept 2026Group revision 1

UBUNTU-CVE-2026-94054

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:UBUNTU-CVE-2026-94054

exim4

Source reference: /affected/0/package/name

Affected versions: 4.80-7ubuntu3
Source reference: /affected/0/versions
4.80-7ubuntu4
Source reference: /affected/0/versions
4.80-9ubuntu1
Source reference: /affected/0/versions
4.80-9ubuntu2
Source reference: /affected/0/versions
4.82-3ubuntu1
Source reference: /affected/0/versions
4.82-3ubuntu2
Source reference: /affected/0/versions
4.82-3ubuntu2.1
Source reference: /affected/0/versions
4.82-3ubuntu2.2
Source reference: /affected/0/versions
4.82-3ubuntu2.3
Source reference: /affected/0/versions
4.82-3ubuntu2.4
Source reference: /affected/0/versions
4.82-3ubuntu2.4+esm1
Source reference: /affected/0/versions
4.82-3ubuntu2.4+esm2
Source reference: /affected/0/versions
4.82-3ubuntu2.4+esm3
Source reference: /affected/0/versions
4.82-3ubuntu2.4+esm4
Source reference: /affected/0/versions
4.82-3ubuntu2.4+esm6
Source reference: /affected/0/versions
4.82-3ubuntu2.4+esm7
Source reference: /affected/0/versions
4.82-3ubuntu2.4+esm8
Source reference: /affected/0/versions
4.82-3ubuntu2.4+esm9
Source reference: /affected/0/versions
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

exim4

Source reference: /affected/1/package/name

Affected versions: 4.86-3ubuntu1
Source reference: /affected/1/versions
4.86-7ubuntu1
Source reference: /affected/1/versions
4.86-7ubuntu2
Source reference: /affected/1/versions
4.86-7ubuntu3
Source reference: /affected/1/versions
4.86.2-2ubuntu1
Source reference: /affected/1/versions
4.86.2-2ubuntu2
Source reference: /affected/1/versions
4.86.2-2ubuntu2.1
Source reference: /affected/1/versions
4.86.2-2ubuntu2.2
Source reference: /affected/1/versions
4.86.2-2ubuntu2.3
Source reference: /affected/1/versions
4.86.2-2ubuntu2.4
Source reference: /affected/1/versions
4.86.2-2ubuntu2.5
Source reference: /affected/1/versions
4.86.2-2ubuntu2.6
Source reference: /affected/1/versions
4.86.2-2ubuntu2.6+esm1
Source reference: /affected/1/versions
4.86.2-2ubuntu2.6+esm2
Source reference: /affected/1/versions
4.86.2-2ubuntu2.6+esm4
Source reference: /affected/1/versions
4.86.2-2ubuntu2.6+esm5
Source reference: /affected/1/versions
4.86.2-2ubuntu2.6+esm6
Source reference: /affected/1/versions
4.86.2-2ubuntu2.6+esm7
Source reference: /affected/1/versions
4.86.2-2ubuntu2.6+esm8
Source reference: /affected/1/versions
4.86.2-2ubuntu2.6+esm9
Source reference: /affected/1/versions
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

exim4

Source reference: /affected/2/package/name

Affected versions: 4.89-5ubuntu1
Source reference: /affected/2/versions
4.89-9ubuntu1
Source reference: /affected/2/versions
4.89-9ubuntu2
Source reference: /affected/2/versions
4.89-9ubuntu3
Source reference: /affected/2/versions
4.89-9ubuntu4
Source reference: /affected/2/versions
4.90.1-1ubuntu1
Source reference: /affected/2/versions
4.90.1-1ubuntu1.1
Source reference: /affected/2/versions
4.90.1-1ubuntu1.2
Source reference: /affected/2/versions
4.90.1-1ubuntu1.3
Source reference: /affected/2/versions
4.90.1-1ubuntu1.4
Source reference: /affected/2/versions
4.90.1-1ubuntu1.5
Source reference: /affected/2/versions
4.90.1-1ubuntu1.8
Source reference: /affected/2/versions
4.90.1-1ubuntu1.9
Source reference: /affected/2/versions
4.90.1-1ubuntu1.10
Source reference: /affected/2/versions
4.90.1-1ubuntu1.10+esm1
Source reference: /affected/2/versions
4.90.1-1ubuntu1.10+esm2
Source reference: /affected/2/versions
4.90.1-1ubuntu1.10+esm3
Source reference: /affected/2/versions
4.90.1-1ubuntu1.10+esm4
Source reference: /affected/2/versions
4.90.1-1ubuntu1.10+esm5
Source reference: /affected/2/versions
4.90.1-1ubuntu1.10+esm6
Source reference: /affected/2/versions
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

exim4

Source reference: /affected/3/package/name

Affected versions: 4.92.1-1ubuntu3
Source reference: /affected/3/versions
4.92.1-1ubuntu4
Source reference: /affected/3/versions
4.93~RC2-1ubuntu1
Source reference: /affected/3/versions
4.93-9ubuntu1
Source reference: /affected/3/versions
4.93-11ubuntu1
Source reference: /affected/3/versions
4.93-12ubuntu1
Source reference: /affected/3/versions
4.93-13ubuntu1
Source reference: /affected/3/versions
4.93-13ubuntu1.1
Source reference: /affected/3/versions
4.93-13ubuntu1.5
Source reference: /affected/3/versions
4.93-13ubuntu1.6
Source reference: /affected/3/versions
4.93-13ubuntu1.7
Source reference: /affected/3/versions
4.93-13ubuntu1.8
Source reference: /affected/3/versions
4.93-13ubuntu1.9
Source reference: /affected/3/versions
4.93-13ubuntu1.10
Source reference: /affected/3/versions
4.93-13ubuntu1.11
Source reference: /affected/3/versions
4.93-13ubuntu1.12
Source reference: /affected/3/versions
4.93-13ubuntu1.12+esm1
Source reference: /affected/3/versions
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

exim4

Source reference: /affected/4/package/name

Affected versions: 4.94.2-7ubuntu2
Source reference: /affected/4/versions
4.95-2ubuntu2
Source reference: /affected/4/versions
4.95-4ubuntu1
Source reference: /affected/4/versions
4.95-4ubuntu2
Source reference: /affected/4/versions
4.95-4ubuntu2.1
Source reference: /affected/4/versions
4.95-4ubuntu2.2
Source reference: /affected/4/versions
4.95-4ubuntu2.3
Source reference: /affected/4/versions
4.95-4ubuntu2.4
Source reference: /affected/4/versions
4.95-4ubuntu2.5
Source reference: /affected/4/versions
4.95-4ubuntu2.6
Source reference: /affected/4/versions
4.95-4ubuntu2.7
Source reference: /affected/4/versions
4.95-4ubuntu2.8
Source reference: /affected/4/versions
4.95-4ubuntu2.9
Source reference: /affected/4/versions
4.95-4ubuntu2.10
Source reference: /affected/4/versions
4.95-4ubuntu2.11
Source reference: /affected/4/versions
Fixed versions: 4.95-4ubuntu2.12
Source reference: /affected/4/ranges
Prerequisites: Not stated in this record

exim4

Source reference: /affected/5/package/name

Affected versions: 4.96-17ubuntu2
Source reference: /affected/5/versions
4.96-17ubuntu2.1
Source reference: /affected/5/versions
4.97-3ubuntu1
Source reference: /affected/5/versions
4.97-4ubuntu1
Source reference: /affected/5/versions
4.97-4ubuntu3
Source reference: /affected/5/versions
4.97-4ubuntu4
Source reference: /affected/5/versions
4.97-4ubuntu4.1
Source reference: /affected/5/versions
4.97-4ubuntu4.2
Source reference: /affected/5/versions
4.97-4ubuntu4.3
Source reference: /affected/5/versions
4.97-4ubuntu4.4
Source reference: /affected/5/versions
4.97-4ubuntu4.5
Source reference: /affected/5/versions
4.97-4ubuntu4.6
Source reference: /affected/5/versions
4.97-4ubuntu4.7
Source reference: /affected/5/versions
Fixed versions: 4.97-4ubuntu4.8
Source reference: /affected/5/ranges
Prerequisites: Not stated in this record

exim4

Source reference: /affected/6/package/name

Affected versions: 4.98.2-1ubuntu2
Source reference: /affected/6/versions
4.99-4ubuntu1
Source reference: /affected/6/versions
4.99.1-1ubuntu1
Source reference: /affected/6/versions
4.99.1-1ubuntu1.1
Source reference: /affected/6/versions
4.99.1-1ubuntu1.2
Source reference: /affected/6/versions
4.99.1-1ubuntu1.3
Source reference: /affected/6/versions
4.99.1-1ubuntu1.4
Source reference: /affected/6/versions
Fixed versions: 4.99.1-1ubuntu1.5
Source reference: /affected/6/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"
          }
        ]
      }
    ],
    "package": {
      "name": "exim4",
      "purl": "pkg:deb/ubuntu/exim4?arch=source&distro=esm-infra-legacy%2Ftrusty",
      "ecosystem": "Ubuntu:Pro:14.04:LTS"
    },
    "versions": [
      "4.80-7ubuntu3",
      "4.80-7ubuntu4",
      "4.80-9ubuntu1",
      "4.80-9ubuntu2",
      "4.82-3ubuntu1",
      "4.82-3ubuntu2",
      "4.82-3ubuntu2.1",
      "4.82-3ubuntu2.2",
      "4.82-3ubuntu2.3",
      "4.82-3ubuntu2.4",
      "4.82-3ubuntu2.4+esm1",
      "4.82-3ubuntu2.4+esm2",
      "4.82-3ubuntu2.4+esm3",
      "4.82-3ubuntu2.4+esm4",
      "4.82-3ubuntu2.4+esm6",
      "4.82-3ubuntu2.4+esm7",
      "4.82-3ubuntu2.4+esm8",
      "4.82-3ubuntu2.4+esm9"
    ],
    "database_specific": {
      "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-94054.json"
    },
    "ecosystem_specific": {
      "binaries": [
        {
          "binary_name": "exim4",
          "binary_version": "4.82-3ubuntu2.4+esm9"
        },
        {
          "binary_name": "exim4-base",
          "binary_version": "4.82-3ubuntu2.4+esm9"
        },
        {
          "binary_name": "exim4-config",
          "binary_version": "4.82-3ubuntu2.4+esm9"
        },
        {
          "binary_name": "exim4-daemon-heavy",
          "binary_version": "4.82-3ubuntu2.4+esm9"
        },
        {
          "binary_name": "exim4-daemon-light",
          "binary_version": "4.82-3ubuntu2.4+esm9"
        },
        {
          "binary_name": "eximon4",
          "binary_version": "4.82-3ubuntu2.4+esm9"
        }
      ]
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          }
        ]
      }
    ],
    "package": {
      "name": "exim4",
      "purl": "pkg:deb/ubuntu/exim4?arch=source&distro=esm-infra-legacy%2Fxenial",
      "ecosystem": "Ubuntu:Pro:16.04:LTS"
    },
    "versions": [
      "4.86-3ubuntu1",
      "4.86-7ubuntu1",
      "4.86-7ubuntu2",
      "4.86-7ubuntu3",
      "4.86.2-2ubuntu1",
      "4.86.2-2ubuntu2",
      "4.86.2-2ubuntu2.1",
      "4.86.2-2ubuntu2.2",
      "4.86.2-2ubuntu2.3",
      "4.86.2-2ubuntu2.4",
      "4.86.2-2ubuntu2.5",
      "4.86.2-2ubuntu2.6",
      "4.86.2-2ubuntu2.6+esm1",
      "4.86.2-2ubuntu2.6+esm2",
      "4.86.2-2ubuntu2.6+esm4",
      "4.86.2-2ubuntu2.6+esm5",
      "4.86.2-2ubuntu2.6+esm6",
      "4.86.2-2ubuntu2.6+esm7",
      "4.86.2-2ubuntu2.6+esm8",
      "4.86.2-2ubuntu2.6+esm9"
    ],
    "database_specific": {
      "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-94054.json"
    },
    "ecosystem_specific": {
      "binaries": [
        {
          "binary_name": "exim4",
          "binary_version": "4.86.2-2ubuntu2.6+esm9"
        },
        {
          "binary_name": "exim4-base",
          "binary_version": "4.86.2-2ubuntu2.6+esm9"
        },
        {
          "binary_name": "exim4-config",
          "binary_version": "4.86.2-2ubuntu2.6+esm9"
        },
        {
          "binary_name": "exim4-daemon-heavy",
          "binary_version": "4.86.2-2ubuntu2.6+esm9"
        },
        {
          "binary_name": "exim4-daemon-light",
          "binary_version": "4.86.2-2ubuntu2.6+esm9"
        },
        {
          "binary_name": "eximon4",
          "binary_version": "4.86.2-2ubuntu2.6+esm9"
        }
      ]
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          }
        ]
      }
    ],
    "package": {
      "name": "exim4",
      "purl": "pkg:deb/ubuntu/exim4?arch=source&distro=esm-infra%2Fbionic",
      "ecosystem": "Ubuntu:Pro:18.04:LTS"
    },
    "versions": [
      "4.89-5ubuntu1",
      "4.89-9ubuntu1",
      "4.89-9ubuntu2",
      "4.89-9ubuntu3",
      "4.89-9ubuntu4",
      "4.90.1-1ubuntu1",
      "4.90.1-1ubuntu1.1",
      "4.90.1-1ubuntu1.2",
      "4.90.1-1ubuntu1.3",
      "4.90.1-1ubuntu1.4",
      "4.90.1-1ubuntu1.5",
      "4.90.1-1ubuntu1.8",
      "4.90.1-1ubuntu1.9",
      "4.90.1-1ubuntu1.10",
      "4.90.1-1ubuntu1.10+esm1",
      "4.90.1-1ubuntu1.10+esm2",
      "4.90.1-1ubuntu1.10+esm3",
      "4.90.1-1ubuntu1.10+esm4",
      "4.90.1-1ubuntu1.10+esm5",
      "4.90.1-1ubuntu1.10+esm6"
    ],
    "database_specific": {
      "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-94054.json"
    },
    "ecosystem_specific": {
      "binaries": [
        {
          "binary_name": "exim4",
          "binary_version": "4.90.1-1ubuntu1.10+esm6"
        },
        {
          "binary_name": "exim4-base",
          "binary_version": "4.90.1-1ubuntu1.10+esm6"
        },
        {
          "binary_name": "exim4-config",
          "binary_version": "4.90.1-1ubuntu1.10+esm6"
        },
        {
          "binary_name": "exim4-daemon-heavy",
          "binary_version": "4.90.1-1ubuntu1.10+esm6"
        },
        {
          "binary_name": "exim4-daemon-light",
          "binary_version": "4.90.1-1ubuntu1.10+esm6"
        },
        {
          "binary_name": "eximon4",
          "binary_version": "4.90.1-1ubuntu1.10+esm6"
        }
      ]
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          }
        ]
      }
    ],
    "package": {
      "name": "exim4",
      "purl": "pkg:deb/ubuntu/exim4?arch=source&distro=esm-infra%2Ffocal",
      "ecosystem": "Ubuntu:Pro:20.04:LTS"
    },
    "versions": [
      "4.92.1-1ubuntu3",
      "4.92.1-1ubuntu4",
      "4.93~RC2-1ubuntu1",
      "4.93-9ubuntu1",
      "4.93-11ubuntu1",
      "4.93-12ubuntu1",
      "4.93-13ubuntu1",
      "4.93-13ubuntu1.1",
      "4.93-13ubuntu1.5",
      "4.93-13ubuntu1.6",
      "4.93-13ubuntu1.7",
      "4.93-13ubuntu1.8",
      "4.93-13ubuntu1.9",
      "4.93-13ubuntu1.10",
      "4.93-13ubuntu1.11",
      "4.93-13ubuntu1.12",
      "4.93-13ubuntu1.12+esm1"
    ],
    "database_specific": {
      "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-94054.json"
    },
    "ecosystem_specific": {
      "binaries": [
        {
          "binary_name": "exim4",
          "binary_version": "4.93-13ubuntu1.12+esm1"
        },
        {
          "binary_name": "exim4-base",
          "binary_version": "4.93-13ubuntu1.12+esm1"
        },
        {
          "binary_name": "exim4-config",
          "binary_version": "4.93-13ubuntu1.12+esm1"
        },
        {
          "binary_name": "exim4-daemon-heavy",
          "binary_version": "4.93-13ubuntu1.12+esm1"
        },
        {
          "binary_name": "exim4-daemon-light",
          "binary_version": "4.93-13ubuntu1.12+esm1"
        },
        {
          "binary_name": "eximon4",
          "binary_version": "4.93-13ubuntu1.12+esm1"
        }
      ]
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "4.95-4ubuntu2.12"
          }
        ]
      }
    ],
    "package": {
      "name": "exim4",
      "purl": "pkg:deb/ubuntu/exim4?arch=source&distro=jammy",
      "ecosystem": "Ubuntu:22.04:LTS"
    },
    "versions": [
      "4.94.2-7ubuntu2",
      "4.95-2ubuntu2",
      "4.95-4ubuntu1",
      "4.95-4ubuntu2",
      "4.95-4ubuntu2.1",
      "4.95-4ubuntu2.2",
      "4.95-4ubuntu2.3",
      "4.95-4ubuntu2.4",
      "4.95-4ubuntu2.5",
      "4.95-4ubuntu2.6",
      "4.95-4ubuntu2.7",
      "4.95-4ubuntu2.8",
      "4.95-4ubuntu2.9",
      "4.95-4ubuntu2.10",
      "4.95-4ubuntu2.11"
    ],
    "database_specific": {
      "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-94054.json"
    },
    "ecosystem_specific": {
      "binaries": [
        {
          "binary_name": "exim4",
          "binary_version": "4.95-4ubuntu2.12"
        },
        {
          "binary_name": "exim4-base",
          "binary_version": "4.95-4ubuntu2.12"
        },
        {
          "binary_name": "exim4-config",
          "binary_version": "4.95-4ubuntu2.12"
        },
        {
          "binary_name": "exim4-daemon-heavy",
          "binary_version": "4.95-4ubuntu2.12"
        },
        {
          "binary_name": "exim4-daemon-light",
          "binary_version": "4.95-4ubuntu2.12"
        },
        {
          "binary_name": "eximon4",
          "binary_version": "4.95-4ubuntu2.12"
        }
      ],
      "availability": "No subscription required"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "4.97-4ubuntu4.8"
          }
        ]
      }
    ],
    "package": {
      "name": "exim4",
      "purl": "pkg:deb/ubuntu/exim4?arch=source&distro=noble",
      "ecosystem": "Ubuntu:24.04:LTS"
    },
    "versions": [
      "4.96-17ubuntu2",
      "4.96-17ubuntu2.1",
      "4.97-3ubuntu1",
      "4.97-4ubuntu1",
      "4.97-4ubuntu3",
      "4.97-4ubuntu4",
      "4.97-4ubuntu4.1",
      "4.97-4ubuntu4.2",
      "4.97-4ubuntu4.3",
      "4.97-4ubuntu4.4",
      "4.97-4ubuntu4.5",
      "4.97-4ubuntu4.6",
      "4.97-4ubuntu4.7"
    ],
    "database_specific": {
      "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-94054.json"
    },
    "ecosystem_specific": {
      "binaries": [
        {
          "binary_name": "exim4",
          "binary_version": "4.97-4ubuntu4.8"
        },
        {
          "binary_name": "exim4-base",
          "binary_version": "4.97-4ubuntu4.8"
        },
        {
          "binary_name": "exim4-config",
          "binary_version": "4.97-4ubuntu4.8"
        },
        {
          "binary_name": "exim4-daemon-heavy",
          "binary_version": "4.97-4ubuntu4.8"
        },
        {
          "binary_name": "exim4-daemon-light",
          "binary_version": "4.97-4ubuntu4.8"
        },
        {
          "binary_name": "eximon4",
          "binary_version": "4.97-4ubuntu4.8"
        }
      ],
      "availability": "No subscription required"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "4.99.1-1ubuntu1.5"
          }
        ]
      }
    ],
    "package": {
      "name": "exim4",
      "purl": "pkg:deb/ubuntu/exim4?arch=source&distro=resolute",
      "ecosystem": "Ubuntu:26.04:LTS"
    },
    "versions": [
      "4.98.2-1ubuntu2",
      "4.99-4ubuntu1",
      "4.99.1-1ubuntu1",
      "4.99.1-1ubuntu1.1",
      "4.99.1-1ubuntu1.2",
      "4.99.1-1ubuntu1.3",
      "4.99.1-1ubuntu1.4"
    ],
    "database_specific": {
      "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-94054.json"
    },
    "ecosystem_specific": {
      "binaries": [
        {
          "binary_name": "exim4",
          "binary_version": "4.99.1-1ubuntu1.5"
        },
        {
          "binary_name": "exim4-base",
          "binary_version": "4.99.1-1ubuntu1.5"
        },
        {
          "binary_name": "exim4-config",
          "binary_version": "4.99.1-1ubuntu1.5"
        },
        {
          "binary_name": "exim4-daemon-heavy",
          "binary_version": "4.99.1-1ubuntu1.5"
        },
        {
          "binary_name": "exim4-daemon-light",
          "binary_version": "4.99.1-1ubuntu1.5"
        },
        {
          "binary_name": "eximon4",
          "binary_version": "4.99.1-1ubuntu1.5"
        }
      ],
      "availability": "No subscription required"
    }
  }
]

Publisher severity

No explicit severity was provided.

Event: #23445 · Revision 1
Added to Heist Feed: Sun, 25 Oct 2026 06:19:22 GMT
Publisher date: Sat, 19 Sep 2026 23:17:00 GMT

Read the original announcement

Revision history

25 Oct 2026UBUNTU-CVE-2026-94054 · Revision 1Source updated