exim4 vulnerabilities
It was discovered that Exim had an out-of-bounds write when Proxy-Protocol was used with an attacker-controlled proxy. A remote attacker could possibly use this issue to execute arbitrary code. (CVE-2026-94054) It was discovered that Exim had a use-after-free when certain non-default TLS settings were used with GnuTLS. A remote attacker could possibly use this issue to cause Exim to crash, resulting in a denial of service. This issue only affected Ubuntu 26.04 LTS. (CVE-2026-94055) It was discovered that Exim allowed attackers to read uninitialized data from stack memory when Proxy-Protocol was used with an attacker-controlled proxy. A remote attacker could possibly use this issue to obtain sensitive information. (CVE-2026-94056) It was discovered that Exim allowed SMTP smuggling via crafted data sent after a rejection during DATA processing. A remote attacker could possibly use this issue to inject arbitrary email messages. (CVE-2026-94057)
USN-8834-1
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:USN-8834-1
exim4
Source reference: /affected/0/package/name
- Affected versions
- 4.94.2-7ubuntu2
Source reference:
/affected/0/versions4.95-2ubuntu2Source reference:
/affected/0/versions4.95-4ubuntu1Source reference:
/affected/0/versions4.95-4ubuntu2Source reference:
/affected/0/versions4.95-4ubuntu2.1Source reference:
/affected/0/versions4.95-4ubuntu2.2Source reference:
/affected/0/versions4.95-4ubuntu2.3Source reference:
/affected/0/versions4.95-4ubuntu2.4Source reference:
/affected/0/versions4.95-4ubuntu2.5Source reference:
/affected/0/versions4.95-4ubuntu2.6Source reference:
/affected/0/versions4.95-4ubuntu2.7Source reference:
/affected/0/versions4.95-4ubuntu2.8Source reference:
/affected/0/versions4.95-4ubuntu2.9Source reference:
/affected/0/versions4.95-4ubuntu2.10Source reference:
/affected/0/versions4.95-4ubuntu2.11Source reference:
/affected/0/versions - Fixed versions
- 4.95-4ubuntu2.12
Source reference:
/affected/0/ranges - Prerequisites
- Not stated in this record
exim4
Source reference: /affected/1/package/name
- Affected versions
- 4.96-17ubuntu2
Source reference:
/affected/1/versions4.96-17ubuntu2.1Source reference:
/affected/1/versions4.97-3ubuntu1Source reference:
/affected/1/versions4.97-4ubuntu1Source reference:
/affected/1/versions4.97-4ubuntu3Source reference:
/affected/1/versions4.97-4ubuntu4Source reference:
/affected/1/versions4.97-4ubuntu4.1Source reference:
/affected/1/versions4.97-4ubuntu4.2Source reference:
/affected/1/versions4.97-4ubuntu4.3Source reference:
/affected/1/versions4.97-4ubuntu4.4Source reference:
/affected/1/versions4.97-4ubuntu4.5Source reference:
/affected/1/versions4.97-4ubuntu4.6Source reference:
/affected/1/versions4.97-4ubuntu4.7Source reference:
/affected/1/versions - Fixed versions
- 4.97-4ubuntu4.8
Source reference:
/affected/1/ranges - Prerequisites
- Not stated in this record
exim4
Source reference: /affected/2/package/name
- Affected versions
- 4.98.2-1ubuntu2
Source reference:
/affected/2/versions4.99-4ubuntu1Source reference:
/affected/2/versions4.99.1-1ubuntu1Source reference:
/affected/2/versions4.99.1-1ubuntu1.1Source reference:
/affected/2/versions4.99.1-1ubuntu1.2Source reference:
/affected/2/versions4.99.1-1ubuntu1.3Source reference:
/affected/2/versions4.99.1-1ubuntu1.4Source reference:
/affected/2/versions - Fixed versions
- 4.99.1-1ubuntu1.5
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": "4.95-4ubuntu2.12"
}
]
}
],
"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/usn/USN-8834-1.json",
"cves_map": {
"cves": [
{
"id": "CVE-2026-94054",
"severity": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:L"
},
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"
},
{
"type": "Ubuntu",
"score": "medium"
}
]
},
{
"id": "CVE-2026-94056",
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{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:L"
},
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"
},
{
"type": "Ubuntu",
"score": "medium"
}
]
},
{
"id": "CVE-2026-94057",
"severity": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N"
},
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N"
},
{
"type": "Ubuntu",
"score": "medium"
}
]
}
],
"ecosystem": "Ubuntu:22.04:LTS"
}
},
"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/usn/USN-8834-1.json",
"cves_map": {
"cves": [
{
"id": "CVE-2026-94054",
"severity": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:L"
},
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"
},
{
"type": "Ubuntu",
"score": "medium"
}
]
},
{
"id": "CVE-2026-94056",
"severity": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:L"
},
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"
},
{
"type": "Ubuntu",
"score": "medium"
}
]
},
{
"id": "CVE-2026-94057",
"severity": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N"
},
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N"
},
{
"type": "Ubuntu",
"score": "medium"
}
]
}
],
"ecosystem": "Ubuntu:24.04:LTS"
}
},
"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/usn/USN-8834-1.json",
"cves_map": {
"cves": [
{
"id": "CVE-2026-94054",
"severity": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:L"
},
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"
},
{
"type": "Ubuntu",
"score": "medium"
}
]
},
{
"id": "CVE-2026-94055",
"severity": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L"
},
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"
},
{
"type": "Ubuntu",
"score": "medium"
}
]
},
{
"id": "CVE-2026-94056",
"severity": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:L"
},
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"
},
{
"type": "Ubuntu",
"score": "medium"
}
]
},
{
"id": "CVE-2026-94057",
"severity": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N"
},
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N"
},
{
"type": "Ubuntu",
"score": "medium"
}
]
}
],
"ecosystem": "Ubuntu:26.04:LTS"
}
},
"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
- #23449 · Revision 1
- Added to Heist Feed
- Publisher date