UBUNTU-CVE-2026-121520

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Source
https://ubuntu.com/security/CVE-2026-121520
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-121520.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-121520
Upstream
Published
2026-11-03T23:17:00Z
Modified
2026-11-05T11:45:27Z
Severity
  • 4.5 (Medium) CVSS_V4 - CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:N/SC:N/SI:H/SA:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

In BuildKit versions prior to v0.34.1, a malicious client with access to the BuildKit control APIs can submit a build request that sets an extended attribute on a file outside the BuildKit state directory. Extended attributes in the trusted. or security. namespaces may also be set, potentially giving a program on the host elevated privileges. This issue affects build services that accept build requests from untrusted users. The issue is fixed in v0.34.1.

References

Affected packages

Ubuntu:26.04:LTS
docker.io

Package

Name
docker.io
Purl
pkg:deb/ubuntu/docker.io?arch=source&distro=resolute

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

26.*
26.1.5+dfsg1-9ubuntu1
27.*
27.5.1+dfsg4-1ubuntu1
27.5.1+dfsg4-2ubuntu1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "golang-github-docker-docker-dev",
            "binary_version": "27.5.1+dfsg4-2ubuntu1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-121520.json"
docker.io-app

Package

Name
docker.io-app
Purl
pkg:deb/ubuntu/docker.io-app?arch=source&distro=resolute

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

28.*
28.2.2-0ubuntu1
29.*
29.1.2-0ubuntu1
29.1.3-0ubuntu1
29.1.3-0ubuntu2
29.1.3-0ubuntu3
29.1.3-0ubuntu4
29.1.3-0ubuntu4.1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "docker.io",
            "binary_version": "29.1.3-0ubuntu4.1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-121520.json"
Ubuntu:26.10
docker.io

Package

Name
docker.io
Purl
pkg:deb/ubuntu/docker.io?arch=source&distro=stonking

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

27.*
27.5.1+dfsg4-2ubuntu1
28.*
28.5.2+dfsg4-5ubuntu1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "golang-github-docker-docker-dev",
            "binary_version": "28.5.2+dfsg4-5ubuntu1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-121520.json"
docker.io-app

Package

Name
docker.io-app
Purl
pkg:deb/ubuntu/docker.io-app?arch=source&distro=stonking

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

29.*
29.1.3-0ubuntu4
29.1.3-0ubuntu5
29.1.3-0ubuntu6
29.7.2-0ubuntu1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "docker.io",
            "binary_version": "29.7.2-0ubuntu1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-121520.json"
Ubuntu:Pro:16.04:LTS
docker.io

Package

Name
docker.io
Purl
pkg:deb/ubuntu/docker.io?arch=source&distro=esm-infra%2Fxenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.6.2~dfsg1-1ubuntu4
1.10.2-0ubuntu3
1.10.2-0ubuntu4
1.10.3-0ubuntu1
1.10.3-0ubuntu4
1.10.3-0ubuntu5
1.10.3-0ubuntu6
1.11.2-0ubuntu5~16.04
1.12.1-0ubuntu13~16.04.1
1.12.3-0ubuntu4~16.04.2
1.12.6-0ubuntu1~16.04.1
1.13.1-0ubuntu1~16.04.2
17.*
17.03.2-0ubuntu2~16.04.1
18.*
18.06.1-0ubuntu1~16.04.2
18.06.1-0ubuntu1.2~16.04.1
18.09.2-0ubuntu1~16.04.1
18.09.5-0ubuntu1~16.04.2
18.09.7-0ubuntu1~16.04.1
18.09.7-0ubuntu1~16.04.4
18.09.7-0ubuntu1~16.04.5
18.09.7-0ubuntu1~16.04.6
18.09.7-0ubuntu1~16.04.7
18.09.7-0ubuntu1~16.04.9+esm1
18.09.7-0ubuntu1~16.04.9+esm2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "docker.io",
            "binary_version": "18.09.7-0ubuntu1~16.04.9+esm2"
        },
        {
            "binary_name": "golang-docker-dev",
            "binary_version": "18.09.7-0ubuntu1~16.04.9+esm2"
        },
        {
            "binary_name": "golang-github-docker-docker-dev",
            "binary_version": "18.09.7-0ubuntu1~16.04.9+esm2"
        },
        {
            "binary_name": "vim-syntax-docker",
            "binary_version": "18.09.7-0ubuntu1~16.04.9+esm2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-121520.json"
Ubuntu:Pro:18.04:LTS
docker.io

Package

Name
docker.io
Purl
pkg:deb/ubuntu/docker.io?arch=source&distro=esm-apps%2Fbionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.13.1-0ubuntu6
17.*
17.03.2-0ubuntu1
17.03.2-0ubuntu3
17.03.2-0ubuntu5
17.12.1-0ubuntu1
18.*
18.06.1-0ubuntu1~18.04.1
18.06.1-0ubuntu1.2~18.04.1
18.09.2-0ubuntu1~18.04.1
18.09.5-0ubuntu1~18.04.2
18.09.7-0ubuntu1~18.04.1
18.09.7-0ubuntu1~18.04.3
18.09.7-0ubuntu1~18.04.4
19.*
19.03.6-0ubuntu1~18.04.1
19.03.6-0ubuntu1~18.04.2
19.03.6-0ubuntu1~18.04.3
20.*
20.10.2-0ubuntu1~18.04.2
20.10.2-0ubuntu1~18.04.3
20.10.7-0ubuntu1~18.04.1
20.10.7-0ubuntu1~18.04.2
20.10.7-0ubuntu5~18.04.2
20.10.7-0ubuntu5~18.04.3
20.10.12-0ubuntu2~18.04.1
20.10.21-0ubuntu1~18.04.2
20.10.21-0ubuntu1~18.04.3
20.10.21-0ubuntu1~18.04.3+esm1
20.10.21-0ubuntu1~18.04.3+esm2
20.10.21-0ubuntu1~18.04.3+esm3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "docker.io",
            "binary_version": "20.10.21-0ubuntu1~18.04.3+esm3"
        },
        {
            "binary_name": "golang-docker-dev",
            "binary_version": "20.10.21-0ubuntu1~18.04.3+esm3"
        },
        {
            "binary_name": "golang-github-docker-docker-dev",
            "binary_version": "20.10.21-0ubuntu1~18.04.3+esm3"
        },
        {
            "binary_name": "vim-syntax-docker",
            "binary_version": "20.10.21-0ubuntu1~18.04.3+esm3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-121520.json"
Ubuntu:Pro:20.04:LTS
docker.io

Package

Name
docker.io
Purl
pkg:deb/ubuntu/docker.io?arch=source&distro=esm-apps%2Ffocal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

19.*
19.03.2-0ubuntu1
19.03.6-0ubuntu1
19.03.8-0ubuntu1
19.03.8-0ubuntu1.20.04
19.03.8-0ubuntu1.20.04.1
19.03.8-0ubuntu1.20.04.2
20.*
20.10.2-0ubuntu1~20.04.2
20.10.2-0ubuntu1~20.04.3
20.10.7-0ubuntu1~20.04.1
20.10.7-0ubuntu1~20.04.2
20.10.7-0ubuntu5~20.04.1
20.10.7-0ubuntu5~20.04.2
20.10.12-0ubuntu2~20.04.1
20.10.21-0ubuntu1~20.04.1
20.10.21-0ubuntu1~20.04.2
20.10.21-0ubuntu1~20.04.4
20.10.21-0ubuntu1~20.04.5
20.10.21-0ubuntu1~20.04.6
20.10.21-0ubuntu1~20.04.6+esm1
20.10.21-0ubuntu1~20.04.6+esm2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "golang-docker-dev",
            "binary_version": "20.10.21-0ubuntu1~20.04.6+esm2"
        },
        {
            "binary_name": "golang-github-docker-docker-dev",
            "binary_version": "20.10.21-0ubuntu1~20.04.6+esm2"
        },
        {
            "binary_name": "vim-syntax-docker",
            "binary_version": "20.10.21-0ubuntu1~20.04.6+esm2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-121520.json"
docker.io-app

Package

Name
docker.io-app
Purl
pkg:deb/ubuntu/docker.io-app?arch=source&distro=esm-apps%2Ffocal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

20.*
20.10.25-0ubuntu1~20.04.1
20.10.25-0ubuntu1~20.04.2
24.*
24.0.5-0ubuntu1~20.04.1
24.0.7-0ubuntu2~20.04.1
26.*
26.1.3-0ubuntu1~20.04.1
26.1.3-0ubuntu1~20.04.1+esm1
26.1.3-0ubuntu1~20.04.1+esm2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "docker.io",
            "binary_version": "26.1.3-0ubuntu1~20.04.1+esm2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-121520.json"
Ubuntu:Pro:22.04:LTS
docker.io

Package

Name
docker.io
Purl
pkg:deb/ubuntu/docker.io?arch=source&distro=esm-apps%2Fjammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

20.*
20.10.7-0ubuntu5
20.10.7-0ubuntu7
20.10.12-0ubuntu1
20.10.12-0ubuntu2
20.10.12-0ubuntu3
20.10.12-0ubuntu3+gke1.24.1
20.10.12-0ubuntu4
20.10.21-0ubuntu1~22.04.2
20.10.21-0ubuntu1~22.04.3
20.10.21-0ubuntu1~22.04.5
20.10.21-0ubuntu1~22.04.6
20.10.21-0ubuntu1~22.04.7
20.10.21-0ubuntu1~22.04.7+esm1
20.10.21-0ubuntu1~22.04.7+esm2
20.10.21-0ubuntu1~22.04.8
20.10.21-0ubuntu1~22.04.8+esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "golang-docker-dev",
            "binary_version": "20.10.21-0ubuntu1~22.04.8+esm1"
        },
        {
            "binary_name": "golang-github-docker-docker-dev",
            "binary_version": "20.10.21-0ubuntu1~22.04.8+esm1"
        },
        {
            "binary_name": "vim-syntax-docker",
            "binary_version": "20.10.21-0ubuntu1~22.04.8+esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-121520.json"
docker.io-app

Package

Name
docker.io-app
Purl
pkg:deb/ubuntu/docker.io-app?arch=source&distro=esm-apps%2Fjammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

20.*
20.10.25-0ubuntu1~22.04.1
20.10.25-0ubuntu1~22.04.2
24.*
24.0.5-0ubuntu1~22.04.1
24.0.7-0ubuntu2~22.04.1
26.*
26.1.3-0ubuntu1~22.04.1
26.1.3-0ubuntu1~22.04.1+esm1
27.*
27.5.1-0ubuntu3~22.04.1
27.5.1-0ubuntu3~22.04.2
28.*
28.2.2-0ubuntu1~22.04.1
29.*
29.1.3-0ubuntu3~22.04.1
29.1.3-0ubuntu3~22.04.2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "docker.io",
            "binary_version": "29.1.3-0ubuntu3~22.04.2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-121520.json"
Ubuntu:Pro:24.04:LTS
docker.io

Package

Name
docker.io
Purl
pkg:deb/ubuntu/docker.io?arch=source&distro=esm-apps%2Fnoble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

20.*
20.10.24+dfsg1-1ubuntu2
20.10.25+dfsg1-2ubuntu1
20.10.25+dfsg1-2ubuntu1+esm1
20.10.25+dfsg1-2ubuntu1+esm2
20.10.25+dfsg1-2ubuntu1.24.04.1
20.10.25+dfsg1-2ubuntu1.24.04.1+esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "golang-github-docker-docker-dev",
            "binary_version": "20.10.25+dfsg1-2ubuntu1.24.04.1+esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-121520.json"
docker.io-app

Package

Name
docker.io-app
Purl
pkg:deb/ubuntu/docker.io-app?arch=source&distro=esm-apps%2Fnoble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

24.*
24.0.5-0ubuntu1
24.0.7-0ubuntu1
24.0.7-0ubuntu2
24.0.7-0ubuntu3
24.0.7-0ubuntu4
24.0.7-0ubuntu4.1
26.*
26.1.3-0ubuntu1~24.04.1
26.1.3-0ubuntu1~24.04.1+esm1
27.*
27.5.1-0ubuntu3~24.04.1
27.5.1-0ubuntu3~24.04.2
28.*
28.2.2-0ubuntu1~24.04.1
29.*
29.1.3-0ubuntu3~24.04.1
29.1.3-0ubuntu3~24.04.2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "docker.io",
            "binary_version": "29.1.3-0ubuntu3~24.04.2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-121520.json"