UBUNTU-CVE-2026-97688

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Source
https://ubuntu.com/security/CVE-2026-97688
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-97688.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-97688
Upstream
Published
2026-09-29T16:17:00Z
Modified
2026-10-01T00:22:47Z
Severity
  • 6.9 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

urllib3 is an HTTP client library for Python. From 2.6.2 until 2.8.0, HTTPResponse.stream and HTTPResponse.read_chunked can enter an infinite loop because the Deflate decoder retains trailing bytes as unconsumed input after reaching end-of-stream and repeatedly decodes them without progress. The issue occurs when an untrusted server sends a chunked Deflate response whose decoded body exceeds a positive finite chunk size and whose encoded body has trailing bytes, specifically a response with Transfer-Encoding: chunked and Content-Encoding: deflate, content decoding enabled, and the positive finite amt=N streaming chunk size. The attack mechanism is that a malicious server returns a compressed chunked response with trailing bytes after the Deflate stream. The impact is excessive CPU usage and a request that does not complete, and network read timeouts do not interrupt the loop because no further socket read occurs. This issue is fixed in version 2.8.0.

References

Affected packages

Ubuntu:22.04:LTS
python-urllib3

Package

Name
python-urllib3
Purl
pkg:deb/ubuntu/python-urllib3?arch=source&distro=jammy

Affected ranges

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

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
1.26.5-1~exp1ubuntu0.5
1.26.5-1~exp1ubuntu0.6
1.26.5-1~exp1ubuntu0.7

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "python3-urllib3",
            "binary_version":  "1.26.5-1~exp1ubuntu0.7"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-97688.json"
Ubuntu:24.04:LTS
python-urllib3

Package

Name
python-urllib3
Purl
pkg:deb/ubuntu/python-urllib3?arch=source&distro=noble

Affected ranges

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

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
2.0.7-1ubuntu0.4
2.0.7-1ubuntu0.5
2.0.7-1ubuntu0.6
2.0.7-1ubuntu0.7

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "python3-urllib3",
            "binary_version":  "2.0.7-1ubuntu0.7"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-97688.json"
Ubuntu:26.04:LTS
python-urllib3

Package

Name
python-urllib3
Purl
pkg:deb/ubuntu/python-urllib3?arch=source&distro=resolute

Affected ranges

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

Affected versions

2.*
2.3.0-3
2.5.0-1
2.5.0-1ubuntu1
2.5.0-1ubuntu2
2.6.3-1ubuntu1
2.6.3-1ubuntu1.1

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "python3-urllib3",
            "binary_version":  "2.6.3-1ubuntu1.1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-97688.json"
Ubuntu:Pro:14.04:LTS
python-pip

Package

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

Affected ranges

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

Affected versions

1.*
1.4.1-2
1.5.4-1
1.5.4-1ubuntu1
1.5.4-1ubuntu3
1.5.4-1ubuntu4
1.5.4-1ubuntu4+esm1
1.5.4-1ubuntu4+esm2
1.5.4-1ubuntu4+esm3
1.5.4-1ubuntu4+esm4
1.5.4-1ubuntu4+esm5

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "python-pip",
            "binary_version":  "1.5.4-1ubuntu4+esm5"
        },
        {
            "binary_name":  "python-pip-whl",
            "binary_version":  "1.5.4-1ubuntu4+esm5"
        },
        {
            "binary_name":  "python3-pip",
            "binary_version":  "1.5.4-1ubuntu4+esm5"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-97688.json"
python-urllib3

Package

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

Affected ranges

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

Affected versions

1.*
1.6-2
1.7.1-1
1.7.1-1build1
1.7.1-1ubuntu0.1
1.7.1-1ubuntu3
1.7.1-1ubuntu4
1.7.1-1ubuntu4.1
1.7.1-1ubuntu4.1+esm1

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "python-urllib3",
            "binary_version":  "1.7.1-1ubuntu4.1+esm1"
        },
        {
            "binary_name":  "python-urllib3-whl",
            "binary_version":  "1.7.1-1ubuntu4.1+esm1"
        },
        {
            "binary_name":  "python3-urllib3",
            "binary_version":  "1.7.1-1ubuntu4.1+esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-97688.json"
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

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
1.13.1-2ubuntu0.16.04.4+esm4

Ecosystem specific 

{
    "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

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-97688.json"
python-pip

Package

Name
python-pip
Purl
pkg:deb/ubuntu/python-pip?arch=source&distro=esm-apps%2Fxenial

Affected ranges

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

Affected versions

1.*
1.5.6-7ubuntu1
1.5.6-7ubuntu2
8.*
8.0.2-7
8.0.3-1
8.0.3-2
8.1.0-1
8.1.0-2
8.1.1-1
8.1.1-2
8.1.1-2ubuntu0.1
8.1.1-2ubuntu0.2
8.1.1-2ubuntu0.4
8.1.1-2ubuntu0.6
8.1.1-2ubuntu0.6+esm2
8.1.1-2ubuntu0.6+esm3
8.1.1-2ubuntu0.6+esm4
8.1.1-2ubuntu0.6+esm5
8.1.1-2ubuntu0.6+esm6
8.1.1-2ubuntu0.6+esm8
8.1.1-2ubuntu0.6+esm10
8.1.1-2ubuntu0.6+esm11
8.1.1-2ubuntu0.6+esm12

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "python-pip",
            "binary_version":  "8.1.1-2ubuntu0.6+esm12"
        },
        {
            "binary_name":  "python-pip-whl",
            "binary_version":  "8.1.1-2ubuntu0.6+esm12"
        },
        {
            "binary_name":  "python3-pip",
            "binary_version":  "8.1.1-2ubuntu0.6+esm12"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-97688.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

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
1.22-1ubuntu0.18.04.2+esm4

Ecosystem specific 

{
    "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

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-97688.json"
python-pip

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown 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-2026-97688.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

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
1.25.8-2ubuntu0.4+esm5

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "python3-urllib3",
            "binary_version":  "1.25.8-2ubuntu0.4+esm5"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-97688.json"
python-pip

Package

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

Affected ranges

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

Affected versions

18.*
18.1-5
18.1-5build1
18.1-5ubuntu1
20.*
20.0.2-2
20.0.2-4
20.0.2-5
20.0.2-5ubuntu1
20.0.2-5ubuntu1.1
20.0.2-5ubuntu1.3
20.0.2-5ubuntu1.4
20.0.2-5ubuntu1.5
20.0.2-5ubuntu1.6
20.0.2-5ubuntu1.7
20.0.2-5ubuntu1.8
20.0.2-5ubuntu1.9
20.0.2-5ubuntu1.10
20.0.2-5ubuntu1.10+esm2
20.0.2-5ubuntu1.11
20.0.2-5ubuntu1.11+esm2
20.0.2-5ubuntu1.11+esm3
20.0.2-5ubuntu1.11+esm4

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "python-pip-whl",
            "binary_version":  "20.0.2-5ubuntu1.11+esm4"
        },
        {
            "binary_name":  "python3-pip",
            "binary_version":  "20.0.2-5ubuntu1.11+esm4"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-97688.json"
Ubuntu:Pro:22.04:LTS
python-pip

Package

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

Affected ranges

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

Affected versions

20.*
20.3.4-4
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
22.0.2+dfsg-1ubuntu0.7+esm1
22.0.2+dfsg-1ubuntu0.7+esm2
22.0.2+dfsg-1ubuntu0.7+esm3

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "python3-pip",
            "binary_version":  "22.0.2+dfsg-1ubuntu0.7+esm3"
        },
        {
            "binary_name":  "python3-pip-whl",
            "binary_version":  "22.0.2+dfsg-1ubuntu0.7+esm3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-97688.json"
Ubuntu:Pro:24.04:LTS
python-pip

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown 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
24.0+dfsg-1ubuntu1.3+esm1
24.0+dfsg-1ubuntu1.3+esm2
24.0+dfsg-1ubuntu1.3+esm3

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "python3-pip",
            "binary_version":  "24.0+dfsg-1ubuntu1.3+esm3"
        },
        {
            "binary_name":  "python3-pip-whl",
            "binary_version":  "24.0+dfsg-1ubuntu1.3+esm3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-97688.json"
Ubuntu:Pro:26.04:LTS
python-pip

Package

Name
python-pip
Purl
pkg:deb/ubuntu/python-pip?arch=source&distro=esm-apps%2Fresolute

Affected ranges

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

Affected versions

25.*
25.1.1+dfsg-1ubuntu2
25.1.1+dfsg-1ubuntu2+esm1
25.1.1+dfsg-1ubuntu2+esm2
25.1.1+dfsg-1ubuntu2+esm3

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "python3-pip",
            "binary_version":  "25.1.1+dfsg-1ubuntu2+esm3"
        },
        {
            "binary_name":  "python3-pip-whl",
            "binary_version":  "25.1.1+dfsg-1ubuntu2+esm3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-97688.json"