USN-8811-1

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Source
https://ubuntu.com/security/notices/USN-8811-1
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8811-1.json
JSON Data
https://api.osv.dev/v1/vulns/USN-8811-1
Upstream
Related
Published
2026-09-24T01:39:52Z
Modified
2026-09-24T13:12:30Z
Summary
python-urllib3 vulnerability
Details

It was discovered that urllib3 did not correctly strip sensitive HTTP headers during cross-origin redirects. An attacker could possibly use this issue to leak sensitive information.

References

Affected packages

Ubuntu:Pro:16.04:LTS / python-urllib3

Package

Name
python-urllib3
Purl
pkg:deb/ubuntu/python-urllib3?arch=source&distro=esm-infra-legacy%2Fxenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
1.13.1-2ubuntu0.16.04.4+esm4

Affected versions

1.*
1.11-1
1.12-1
1.13.1-1
1.13.1-2
1.13.1-2ubuntu0.16.04.1
1.13.1-2ubuntu0.16.04.2
1.13.1-2ubuntu0.16.04.3
1.13.1-2ubuntu0.16.04.4
1.13.1-2ubuntu0.16.04.4+esm1
1.13.1-2ubuntu0.16.04.4+esm2
1.13.1-2ubuntu0.16.04.4+esm3

Ecosystem specific 

{
    "availability":  "Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro",
    "binaries":  [
        {
            "binary_name":  "python-urllib3",
            "binary_version":  "1.13.1-2ubuntu0.16.04.4+esm4"
        },
        {
            "binary_name":  "python3-urllib3",
            "binary_version":  "1.13.1-2ubuntu0.16.04.4+esm4"
        }
    ]
}

Database specific

cves_map 
{
    "cves":  [
        {
            "id":  "CVE-2026-44431",
            "severity":  [
                {
                    "score":  "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N",
                    "type":  "CVSS_V4"
                },
                {
                    "score":  "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
                    "type":  "CVSS_V3"
                },
                {
                    "score":  "medium",
                    "type":  "Ubuntu"
                }
            ]
        }
    ],
    "ecosystem":  "Ubuntu:Pro:16.04:LTS"
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8811-1.json"

Ubuntu:Pro:18.04:LTS / python-urllib3

Package

Name
python-urllib3
Purl
pkg:deb/ubuntu/python-urllib3?arch=source&distro=esm-infra%2Fbionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
1.22-1ubuntu0.18.04.2+esm4

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 

{
    "availability":  "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
    "binaries":  [
        {
            "binary_name":  "python-urllib3",
            "binary_version":  "1.22-1ubuntu0.18.04.2+esm4"
        },
        {
            "binary_name":  "python3-urllib3",
            "binary_version":  "1.22-1ubuntu0.18.04.2+esm4"
        }
    ]
}

Database specific

cves_map 
{
    "cves":  [
        {
            "id":  "CVE-2026-44431",
            "severity":  [
                {
                    "score":  "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N",
                    "type":  "CVSS_V4"
                },
                {
                    "score":  "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
                    "type":  "CVSS_V3"
                },
                {
                    "score":  "medium",
                    "type":  "Ubuntu"
                }
            ]
        }
    ],
    "ecosystem":  "Ubuntu:Pro:18.04:LTS"
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8811-1.json"

Ubuntu:Pro:20.04:LTS / python-urllib3

Package

Name
python-urllib3
Purl
pkg:deb/ubuntu/python-urllib3?arch=source&distro=esm-infra%2Ffocal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
1.25.8-2ubuntu0.4+esm5

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
1.25.8-2ubuntu0.4+esm3
1.25.8-2ubuntu0.4+esm4

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+esm5"
        }
    ]
}

Database specific

cves_map 
{
    "cves":  [
        {
            "id":  "CVE-2026-44431",
            "severity":  [
                {
                    "score":  "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N",
                    "type":  "CVSS_V4"
                },
                {
                    "score":  "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
                    "type":  "CVSS_V3"
                },
                {
                    "score":  "medium",
                    "type":  "Ubuntu"
                }
            ]
        }
    ],
    "ecosystem":  "Ubuntu:Pro:20.04:LTS"
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8811-1.json"