UBUNTU-CVE-2026-21441

8.9 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H CVSS Calculator
7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Ubuntu - medium

Summary

[none]

Details

urllib3 is an HTTP client library for Python. urllib3's streaming API is designed for the efficient handling of large HTTP responses by reading the content in chunks, rather than loading the entire response body into memory at once. urllib3 can perform decoding or decompression based on the HTTP Content-Encoding header (e.g., gzip, deflate, br, or zstd). When using the streaming API, the library decompresses only the necessary bytes, enabling partial content consumption. Starting in version 1.22 and prior to version 2.6.3, for HTTP redirect responses, the library would read the entire response body to drain the connection and decompress the content unnecessarily. This decompression occurred even before any read methods were called, and configured read limits did not restrict the amount of decompressed data. As a result, there was no safeguard against decompression bombs. A malicious server could exploit this to trigger excessive resource consumption on the client. Applications and libraries are affected when they stream content from untrusted sources by setting preload_content=False when they do not disable redirects. Users should upgrade to at least urllib3 v2.6.3, in which the library does not decode content of redirect responses when preload_content=False. If upgrading is not immediately possible, disable redirects by setting redirect=False for requests to untrusted source.

References

Affected packages

Ubuntu:22.04:LTS

python-pip

Package

Name: python-pip
Purl: pkg:deb/ubuntu/python-pip@22.0.2+dfsg-1ubuntu0.7?arch=source&distro=jammy

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

20.*

20.3.4-4

21.*

21.3.1+dfsg-3

22.*

22.0.2+dfsg-1

22.0.2+dfsg-1ubuntu0.1

22.0.2+dfsg-1ubuntu0.2

22.0.2+dfsg-1ubuntu0.3

22.0.2+dfsg-1ubuntu0.4

22.0.2+dfsg-1ubuntu0.5

22.0.2+dfsg-1ubuntu0.6

22.0.2+dfsg-1ubuntu0.7

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "python3-pip",
            "binary_version": "22.0.2+dfsg-1ubuntu0.7"
        },
        {
            "binary_name": "python3-pip-whl",
            "binary_version": "22.0.2+dfsg-1ubuntu0.7"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-21441.json"

python-urllib3

Package

Name: python-urllib3
Purl: pkg:deb/ubuntu/python-urllib3@1.26.5-1~exp1ubuntu0.5?arch=source&distro=jammy

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

1.26.5-1~exp1ubuntu0.5

Affected versions

1.*

1.26.5-1~exp1

1.26.5-1~exp1ubuntu0.1

1.26.5-1~exp1ubuntu0.2

1.26.5-1~exp1ubuntu0.3

1.26.5-1~exp1ubuntu0.4

Ecosystem specific

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "python3-urllib3",
            "binary_version": "1.26.5-1~exp1ubuntu0.5"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-21441.json"

Ubuntu:24.04:LTS

python-pip

Package

Name: python-pip
Purl: pkg:deb/ubuntu/python-pip@24.0+dfsg-1ubuntu1.3?arch=source&distro=noble

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

23.*

23.2+dfsg-1

23.3+dfsg-1

24.*

24.0+dfsg-1

24.0+dfsg-1ubuntu1

24.0+dfsg-1ubuntu1.1

24.0+dfsg-1ubuntu1.2

24.0+dfsg-1ubuntu1.3

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "python3-pip",
            "binary_version": "24.0+dfsg-1ubuntu1.3"
        },
        {
            "binary_name": "python3-pip-whl",
            "binary_version": "24.0+dfsg-1ubuntu1.3"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-21441.json"

python-urllib3

Package

Name: python-urllib3
Purl: pkg:deb/ubuntu/python-urllib3@2.0.7-1ubuntu0.4?arch=source&distro=noble

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

2.0.7-1ubuntu0.4

Affected versions

1.*

1.26.16-1

1.26.18-1

2.*

2.0.7-1

2.0.7-1ubuntu0.1

2.0.7-1ubuntu0.2

2.0.7-1ubuntu0.3

Ecosystem specific

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "python3-urllib3",
            "binary_version": "2.0.7-1ubuntu0.4"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-21441.json"

Ubuntu:25.10

python-pip

Package

Name: python-pip
Purl: pkg:deb/ubuntu/python-pip@25.1.1+dfsg-1ubuntu2?arch=source&distro=questing

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

25.*

25.0+dfsg-1

25.1.1+dfsg-1

25.1.1+dfsg-1ubuntu1

25.1.1+dfsg-1ubuntu2

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "python3-pip",
            "binary_version": "25.1.1+dfsg-1ubuntu2"
        },
        {
            "binary_name": "python3-pip-whl",
            "binary_version": "25.1.1+dfsg-1ubuntu2"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-21441.json"

python-urllib3

Package

Name: python-urllib3
Purl: pkg:deb/ubuntu/python-urllib3@2.3.0-3ubuntu0.2?arch=source&distro=questing

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

2.3.0-3ubuntu0.2

Affected versions

2.*

2.3.0-2

2.3.0-2ubuntu1

2.3.0-3

2.3.0-3ubuntu0.1

Ecosystem specific

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "python3-urllib3",
            "binary_version": "2.3.0-3ubuntu0.2"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-21441.json"

Ubuntu:Pro:18.04:LTS

python-urllib3

Package

Name: python-urllib3
Purl: pkg:deb/ubuntu/python-urllib3@1.22-1ubuntu0.18.04.2+esm3?arch=source&distro=esm-infra/bionic

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

1.*

1.21.1-1

1.22-1

1.22-1ubuntu0.18.04.1

1.22-1ubuntu0.18.04.2

1.22-1ubuntu0.18.04.2+esm1

1.22-1ubuntu0.18.04.2+esm2

1.22-1ubuntu0.18.04.2+esm3

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "python-urllib3",
            "binary_version": "1.22-1ubuntu0.18.04.2+esm3"
        },
        {
            "binary_name": "python3-urllib3",
            "binary_version": "1.22-1ubuntu0.18.04.2+esm3"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-21441.json"

python-pip

Package

Name: python-pip
Purl: pkg:deb/ubuntu/python-pip@9.0.1-2.3~ubuntu1.18.04.8+esm8?arch=source&distro=esm-apps/bionic

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

9.*

9.0.1-2

9.0.1-2.3~ubuntu1

9.0.1-2.3~ubuntu1.18.04.1

9.0.1-2.3~ubuntu1.18.04.2

9.0.1-2.3~ubuntu1.18.04.3

9.0.1-2.3~ubuntu1.18.04.4

9.0.1-2.3~ubuntu1.18.04.5

9.0.1-2.3~ubuntu1.18.04.5+esm2

9.0.1-2.3~ubuntu1.18.04.5+esm3

9.0.1-2.3~ubuntu1.18.04.6

9.0.1-2.3~ubuntu1.18.04.6+esm1

9.0.1-2.3~ubuntu1.18.04.7

9.0.1-2.3~ubuntu1.18.04.7+esm1

9.0.1-2.3~ubuntu1.18.04.8

9.0.1-2.3~ubuntu1.18.04.8+esm1

9.0.1-2.3~ubuntu1.18.04.8+esm2

9.0.1-2.3~ubuntu1.18.04.8+esm4

9.0.1-2.3~ubuntu1.18.04.8+esm6

9.0.1-2.3~ubuntu1.18.04.8+esm7

9.0.1-2.3~ubuntu1.18.04.8+esm8

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "python-pip",
            "binary_version": "9.0.1-2.3~ubuntu1.18.04.8+esm8"
        },
        {
            "binary_name": "python-pip-whl",
            "binary_version": "9.0.1-2.3~ubuntu1.18.04.8+esm8"
        },
        {
            "binary_name": "python3-pip",
            "binary_version": "9.0.1-2.3~ubuntu1.18.04.8+esm8"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-21441.json"

Ubuntu:Pro:20.04:LTS

python-urllib3

Package

Name: python-urllib3
Purl: pkg:deb/ubuntu/python-urllib3@1.25.8-2ubuntu0.4+esm3?arch=source&distro=esm-infra/focal

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

1.25.8-2ubuntu0.4+esm3

Affected versions

1.*

1.24.1-1ubuntu1

1.24.1-1ubuntu2

1.25.8-1

1.25.8-2

1.25.8-2ubuntu0.1

1.25.8-2ubuntu0.2

1.25.8-2ubuntu0.3

1.25.8-2ubuntu0.4

1.25.8-2ubuntu0.4+esm1

1.25.8-2ubuntu0.4+esm2

Ecosystem specific

{
    "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
    "binaries": [
        {
            "binary_name": "python3-urllib3",
            "binary_version": "1.25.8-2ubuntu0.4+esm3"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-21441.json"