UBUNTU-CVE-2026-59980

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Source
https://ubuntu.com/security/CVE-2026-59980
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-59980.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-59980
Upstream
Published
2026-09-24T00:00:00Z
Modified
2026-09-25T06:36:30Z
Severity
  • 6.3 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

hpack is an HTTP/2 Header Encoding for Python. Prior to version 4.2.0, unbounded variable integer decoding can cause run-away computation on malformed input leading to O(n^2) runtime, effectively blocking further processing with large enough unsanitized input. A fix is available in python-hyper/hpack v4.2.0 to restricted variable integer decoding to uint32 to prevent run-away computation. As a workaround, sanitize input to hpack decoder for long sequences of 0xFF values to prevent malicious use.

References

Affected packages

Ubuntu:16.04:LTS
python-hpack

Package

Name
python-hpack
Purl
pkg:deb/ubuntu/python-hpack?arch=source&distro=xenial

Affected ranges

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

Affected versions

1.*
1.1.0-1
2.*
2.0.1-1
2.1.0-1

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "python-hpack",
            "binary_version":  "2.1.0-1"
        },
        {
            "binary_name":  "python3-hpack",
            "binary_version":  "2.1.0-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-59980.json"
Ubuntu:18.04:LTS
python-hpack

Package

Name
python-hpack
Purl
pkg:deb/ubuntu/python-hpack?arch=source&distro=bionic

Affected ranges

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

Affected versions

3.*
3.0.0-1
3.0.0-2

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "python-hpack",
            "binary_version":  "3.0.0-2"
        },
        {
            "binary_name":  "python3-hpack",
            "binary_version":  "3.0.0-2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-59980.json"
Ubuntu:20.04:LTS
python-hpack

Package

Name
python-hpack
Purl
pkg:deb/ubuntu/python-hpack?arch=source&distro=focal

Affected ranges

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

Affected versions

3.*
3.0.0-3
3.0.0-4

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "python3-hpack",
            "binary_version":  "3.0.0-4"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-59980.json"
Ubuntu:22.04:LTS
python-hpack

Package

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

Affected ranges

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

Affected versions

4.*
4.0.0-2

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "python3-hpack",
            "binary_version":  "4.0.0-2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-59980.json"
Ubuntu:24.04:LTS
python-hpack

Package

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

Affected ranges

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

Affected versions

4.*
4.0.0-2

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "python3-hpack",
            "binary_version":  "4.0.0-2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-59980.json"
Ubuntu:26.04:LTS
python-hpack

Package

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

Affected ranges

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

Affected versions

4.*
4.0.0-3

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "python3-hpack",
            "binary_version":  "4.0.0-3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-59980.json"