UBUNTU-CVE-2026-109518

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Source

https://ubuntu.com/security/CVE-2026-109518

Import Source

https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-109518.json

JSON Data

https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-109518

Upstream

CVE-2026-109518

Published

2026-11-04T12:00:00Z

Modified

2026-11-04T20:03:28Z

Severity

7.7 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N CVSS Calculator
Ubuntu - high

Summary

[none]

Details

On Debian, Ubuntu, and derivative Linux distributions, an on-path attacker who can manipulate the HTTP traffic (including a malicious mirror or proxy) between an APT client and an archive server triggered by a package install can trick the client into installing an attacker-controlled unverified package and achieve remote code execution with root privileges. The vulnerability is caused by the reuse of hard links and requires the client to follow redirects and retry the download of package files. It requires the client to have a non-zero Acquire::Retries configuration setting; the value 3 is the default starting with Debian 12 (bookworm) and Ubuntu 22.04 LTS (Jammy Jellyfish), so older releases are unaffected in a default configuration.

References

Affected packages

Ubuntu:22.04:LTS

apt

Package

Name: apt
Purl: pkg:deb/ubuntu/apt?arch=source&distro=jammy

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Affected versions

2.*

2.3.9

2.3.11

2.3.12

2.3.13

2.3.14

2.3.15

2.3.15build1

2.4.1

2.4.3

2.4.5

2.4.6

2.4.7

2.4.8

2.4.9

2.4.10

2.4.11

2.4.12

2.4.13

2.4.14

2.4.15ubuntu0.1

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "apt",
            "binary_version": "2.4.15ubuntu0.1"
        },
        {
            "binary_name": "apt-transport-https",
            "binary_version": "2.4.15ubuntu0.1"
        },
        {
            "binary_name": "apt-utils",
            "binary_version": "2.4.15ubuntu0.1"
        },
        {
            "binary_name": "libapt-pkg6.0",
            "binary_version": "2.4.15ubuntu0.1"
        }
    ],
    "priority_reason": "See ubuntu cvss score"
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-109518.json"

Ubuntu:24.04:LTS

apt

Package

Name: apt
Purl: pkg:deb/ubuntu/apt?arch=source&distro=noble

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Affected versions

2.*

2.7.3

2.7.6

2.7.10

2.7.11

2.7.12

2.7.14

2.7.14build2

2.8.3

2.8.4ubuntu0.1

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "apt",
            "binary_version": "2.8.4ubuntu0.1"
        },
        {
            "binary_name": "apt-transport-https",
            "binary_version": "2.8.4ubuntu0.1"
        },
        {
            "binary_name": "apt-utils",
            "binary_version": "2.8.4ubuntu0.1"
        },
        {
            "binary_name": "libapt-pkg6.0t64",
            "binary_version": "2.8.4ubuntu0.1"
        }
    ],
    "priority_reason": "See ubuntu cvss score"
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-109518.json"

Ubuntu:26.04:LTS

apt

Package

Name: apt
Purl: pkg:deb/ubuntu/apt?arch=source&distro=resolute

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Affected versions

3.*

3.1.6ubuntu2

3.1.8ubuntu1

3.1.11

3.1.12

3.1.13

3.1.14

3.1.15

3.1.16

3.2.0

3.2.1ubuntu0.1

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "apt",
            "binary_version": "3.2.1ubuntu0.1"
        },
        {
            "binary_name": "apt-transport-https",
            "binary_version": "3.2.1ubuntu0.1"
        },
        {
            "binary_name": "apt-utils",
            "binary_version": "3.2.1ubuntu0.1"
        },
        {
            "binary_name": "libapt-pkg7.0",
            "binary_version": "3.2.1ubuntu0.1"
        }
    ],
    "priority_reason": "See ubuntu cvss score"
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-109518.json"

Ubuntu:26.10

apt

Package

Name: apt
Purl: pkg:deb/ubuntu/apt?arch=source&distro=stonking

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Affected versions

3.*

3.2.0

3.3.2

3.3.3

3.3.3ubuntu0.1

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "apt",
            "binary_version": "3.3.3ubuntu0.1"
        },
        {
            "binary_name": "apt-transport-https",
            "binary_version": "3.3.3ubuntu0.1"
        },
        {
            "binary_name": "apt-utils",
            "binary_version": "3.3.3ubuntu0.1"
        },
        {
            "binary_name": "libapt-pkg7.0",
            "binary_version": "3.3.3ubuntu0.1"
        }
    ],
    "priority_reason": "See ubuntu cvss score"
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-109518.json"

Ubuntu:Pro:14.04:LTS

apt

Package

Name: apt
Purl: pkg:deb/ubuntu/apt?arch=source&distro=esm-infra-legacy%2Ftrusty

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Affected versions

0.*

0.9.9.1~ubuntu3

0.9.9.1~ubuntu4

0.9.9.1~ubuntu5

0.9.13~exp1ubuntu1

0.9.13~exp1ubuntu2

0.9.13~exp1ubuntu3

0.9.13.1~ubuntu1

0.9.14.1ubuntu1

0.9.14.1ubuntu2

0.9.15.1ubuntu1

0.9.15.4ubuntu1

0.9.15.4ubuntu2

0.9.15.4ubuntu3

0.9.15.4ubuntu4

0.9.15.4ubuntu5

1.*

1.0.1ubuntu2

1.0.1ubuntu2.1

1.0.1ubuntu2.3

1.0.1ubuntu2.4.1

1.0.1ubuntu2.5

1.0.1ubuntu2.6

1.0.1ubuntu2.7

1.0.1ubuntu2.8

1.0.1ubuntu2.9

1.0.1ubuntu2.10

1.0.1ubuntu2.11

1.0.1ubuntu2.12

1.0.1ubuntu2.13

1.0.1ubuntu2.14

1.0.1ubuntu2.15

1.0.1ubuntu2.17

1.0.1ubuntu2.18

1.0.1ubuntu2.19

1.0.1ubuntu2.20

1.0.1ubuntu2.22

1.0.1ubuntu2.23

1.0.1ubuntu2.24

1.0.1ubuntu2.24+esm1

1.0.1ubuntu2.24+esm3

1.0.1ubuntu2.24+esm4

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "apt",
            "binary_version": "1.0.1ubuntu2.24+esm4"
        },
        {
            "binary_name": "apt-transport-https",
            "binary_version": "1.0.1ubuntu2.24+esm4"
        },
        {
            "binary_name": "apt-utils",
            "binary_version": "1.0.1ubuntu2.24+esm4"
        },
        {
            "binary_name": "libapt-inst1.5",
            "binary_version": "1.0.1ubuntu2.24+esm4"
        },
        {
            "binary_name": "libapt-pkg4.12",
            "binary_version": "1.0.1ubuntu2.24+esm4"
        }
    ],
    "priority_reason": "See ubuntu cvss score"
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-109518.json"

Ubuntu:Pro:16.04:LTS

apt

Package

Name: apt
Purl: pkg:deb/ubuntu/apt?arch=source&distro=esm-infra-legacy%2Fxenial

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Affected versions

1.*

1.0.10.2ubuntu1

1.1.4

1.1.5

1.1.10

1.2.3

1.2.4

1.2.6

1.2.7

1.2.8

1.2.9

1.2.10

1.2.10ubuntu1

1.2.12~ubuntu16.04.1

1.2.15

1.2.15ubuntu0.2

1.2.18

1.2.19

1.2.20

1.2.24

1.2.25

1.2.26

1.2.27

1.2.29

1.2.29ubuntu0.1

1.2.31

1.2.32

1.2.32ubuntu0.1

1.2.32ubuntu0.2

1.2.35

1.2.36+esm1

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "apt",
            "binary_version": "1.2.36+esm1"
        },
        {
            "binary_name": "apt-transport-https",
            "binary_version": "1.2.36+esm1"
        },
        {
            "binary_name": "apt-utils",
            "binary_version": "1.2.36+esm1"
        },
        {
            "binary_name": "libapt-inst2.0",
            "binary_version": "1.2.36+esm1"
        },
        {
            "binary_name": "libapt-pkg5.0",
            "binary_version": "1.2.36+esm1"
        }
    ],
    "priority_reason": "See ubuntu cvss score"
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-109518.json"

Ubuntu:Pro:18.04:LTS

apt

Package

Name: apt
Purl: pkg:deb/ubuntu/apt?arch=source&distro=esm-infra%2Fbionic

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Affected versions

1.*

1.5

1.5.1

1.6~alpha5

1.6~alpha7ubuntu1

1.6~alpha7ubuntu2

1.6~beta1

1.6~rc1

1.6

1.6.1

1.6.2

1.6.3

1.6.3ubuntu0.1

1.6.6

1.6.6ubuntu0.1

1.6.8

1.6.10

1.6.11

1.6.12

1.6.12ubuntu0.1

1.6.12ubuntu0.2

1.6.13

1.6.14

1.6.17

1.6.18~esm1

1.6.19+esm1

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "apt",
            "binary_version": "1.6.19+esm1"
        },
        {
            "binary_name": "apt-transport-https",
            "binary_version": "1.6.19+esm1"
        },
        {
            "binary_name": "apt-utils",
            "binary_version": "1.6.19+esm1"
        },
        {
            "binary_name": "libapt-inst2.0",
            "binary_version": "1.6.19+esm1"
        },
        {
            "binary_name": "libapt-pkg5.0",
            "binary_version": "1.6.19+esm1"
        }
    ],
    "priority_reason": "See ubuntu cvss score"
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-109518.json"

Ubuntu:Pro:20.04:LTS

apt

Package

Name: apt
Purl: pkg:deb/ubuntu/apt?arch=source&distro=esm-infra%2Ffocal

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Affected versions

1.*

1.9.4

1.9.5

1.9.7

1.9.8

1.9.9

1.9.10

2.*

2.0.0

2.0.1

2.0.1ubuntu1

2.0.2

2.0.2ubuntu0.1

2.0.2ubuntu0.2

2.0.4

2.0.5

2.0.6

2.0.8

2.0.9

2.0.10

2.0.11

2.0.12+esm1

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "apt",
            "binary_version": "2.0.12+esm1"
        },
        {
            "binary_name": "apt-transport-https",
            "binary_version": "2.0.12+esm1"
        },
        {
            "binary_name": "apt-utils",
            "binary_version": "2.0.12+esm1"
        },
        {
            "binary_name": "libapt-pkg6.0",
            "binary_version": "2.0.12+esm1"
        }
    ],
    "priority_reason": "See ubuntu cvss score"
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-109518.json"