UBUNTU-CVE-2026-96276

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Source

https://ubuntu.com/security/CVE-2026-96276

Import Source

https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-96276.json

JSON Data

https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-96276

Upstream

CVE-2026-96276

Published

2026-09-23T15:17:00Z

Modified

2026-10-01T00:22:42Z

Severity

9.8 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
6.5 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N CVSS Calculator
Ubuntu - medium

Summary

[none]

Details

If a malicious SDK container declares an extension point with a crafted directory path, and a developer runs flatpak build-init --writable-sdk --sdk-extension with that SDK, attacker-chosen files could be written outside the working directory, since the target path is resolved via a function that allows .. traversal.

References

Affected packages

Ubuntu:Pro:18.04:LTS / flatpak

Package

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

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Affected versions

0.*

0.8.7-5

0.10.0-1

0.10.0-2

0.10.1-1

0.10.2-1

0.10.2.1-1

0.10.2.1-2

0.10.3-1

0.11.1-0ubuntu1

0.11.3-2

0.11.3-3

0.11.7-0ubuntu0.1

1.*

1.0.1-0ubuntu0.1

1.0.6-0ubuntu0.1

1.0.7-0ubuntu0.18.04.1

1.0.8-0ubuntu0.18.04.1

1.0.9-0ubuntu0.1

1.0.9-0ubuntu0.2

1.0.9-0ubuntu0.3

1.0.9-0ubuntu0.4

1.0.9-0ubuntu0.4+esm1

Ecosystem specific

{
    "binaries":  [
        {
            "binary_name":  "flatpak",
            "binary_version":  "1.0.9-0ubuntu0.4+esm1"
        },
        {
            "binary_name":  "flatpak-tests",
            "binary_version":  "1.0.9-0ubuntu0.4+esm1"
        },
        {
            "binary_name":  "gir1.2-flatpak-1.0",
            "binary_version":  "1.0.9-0ubuntu0.4+esm1"
        },
        {
            "binary_name":  "libflatpak0",
            "binary_version":  "1.0.9-0ubuntu0.4+esm1"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-96276.json"

Ubuntu:Pro:20.04:LTS / flatpak

Package

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

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Affected versions

1.*

1.4.3-1

1.6.0-1

1.6.1-1

1.6.2-1

1.6.3-1

1.6.5-0ubuntu0.1

1.6.5-0ubuntu0.2

1.6.5-0ubuntu0.3

1.6.5-0ubuntu0.4

1.6.5-0ubuntu0.5

1.6.5-0ubuntu0.5+esm1

Ecosystem specific

{
    "binaries":  [
        {
            "binary_name":  "flatpak",
            "binary_version":  "1.6.5-0ubuntu0.5+esm1"
        },
        {
            "binary_name":  "flatpak-tests",
            "binary_version":  "1.6.5-0ubuntu0.5+esm1"
        },
        {
            "binary_name":  "gir1.2-flatpak-1.0",
            "binary_version":  "1.6.5-0ubuntu0.5+esm1"
        },
        {
            "binary_name":  "libflatpak0",
            "binary_version":  "1.6.5-0ubuntu0.5+esm1"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-96276.json"

Ubuntu:Pro:22.04:LTS / flatpak

Package

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

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Affected versions

1.*

1.10.2-3

1.12.2-1

1.12.2-2

1.12.3-1

1.12.4-1

1.12.5-1

1.12.6-1

1.12.7-1

1.12.7-1ubuntu0.1

1.12.7-1ubuntu0.1+esm1

Ecosystem specific

{
    "binaries":  [
        {
            "binary_name":  "flatpak",
            "binary_version":  "1.12.7-1ubuntu0.1+esm1"
        },
        {
            "binary_name":  "flatpak-tests",
            "binary_version":  "1.12.7-1ubuntu0.1+esm1"
        },
        {
            "binary_name":  "gir1.2-flatpak-1.0",
            "binary_version":  "1.12.7-1ubuntu0.1+esm1"
        },
        {
            "binary_name":  "libflatpak0",
            "binary_version":  "1.12.7-1ubuntu0.1+esm1"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-96276.json"

Ubuntu:Pro:24.04:LTS / flatpak

Package

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

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Affected versions

1.*

1.14.4-2

1.14.5-1

1.14.5-1build1

1.14.5-1build4

1.14.5-1build5

1.14.5-1build6

1.14.6-1

1.14.6-1ubuntu0.1

1.14.6-1ubuntu0.1+esm1

Ecosystem specific

{
    "binaries":  [
        {
            "binary_name":  "flatpak",
            "binary_version":  "1.14.6-1ubuntu0.1+esm1"
        },
        {
            "binary_name":  "flatpak-tests",
            "binary_version":  "1.14.6-1ubuntu0.1+esm1"
        },
        {
            "binary_name":  "gir1.2-flatpak-1.0",
            "binary_version":  "1.14.6-1ubuntu0.1+esm1"
        },
        {
            "binary_name":  "libflatpak0",
            "binary_version":  "1.14.6-1ubuntu0.1+esm1"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-96276.json"

Ubuntu:26.04:LTS / flatpak

Package

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

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Affected versions

1.*

1.16.1-2ubuntu1

1.16.1-3ubuntu1

1.16.2-1

1.16.3-1

1.16.3-1build1

1.16.4-1

1.16.4-2

1.16.6-1

Ecosystem specific

{
    "binaries":  [
        {
            "binary_name":  "flatpak",
            "binary_version":  "1.16.6-1"
        },
        {
            "binary_name":  "flatpak-tests",
            "binary_version":  "1.16.6-1"
        },
        {
            "binary_name":  "gir1.2-flatpak-1.0",
            "binary_version":  "1.16.6-1"
        },
        {
            "binary_name":  "libflatpak0",
            "binary_version":  "1.16.6-1"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-96276.json"