UBUNTU-CVE-2025-57804

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Source
https://ubuntu.com/security/CVE-2025-57804
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-57804.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2025-57804
Upstream
Published
2025-08-25T21:15:00Z
Modified
2026-04-27T18:53:36.660609Z
Severity
  • 6.9 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

h2 is a pure-Python implementation of a HTTP/2 protocol stack. Prior to version 4.3.0, an HTTP/2 request splitting vulnerability allows attackers to perform request smuggling attacks by injecting CRLF characters into headers. This occurs when servers downgrade HTTP/2 requests to HTTP/1.1 without properly validating header names/values, enabling attackers to manipulate request boundaries and bypass security controls. This issue has been patched in version 4.3.0.

References

Affected packages

Ubuntu:18.04:LTS
python-h2

Package

Name
python-h2
Purl
pkg:deb/ubuntu/python-h2@3.0.1-3?arch=source&distro=bionic

Affected ranges

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

Affected versions

3.*
3.0.1-1
3.0.1-2
3.0.1-3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "python-h2",
            "binary_version": "3.0.1-3"
        },
        {
            "binary_name": "python3-h2",
            "binary_version": "3.0.1-3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-57804.json"
Ubuntu:20.04:LTS
python-h2

Package

Name
python-h2
Purl
pkg:deb/ubuntu/python-h2@3.1.1-1?arch=source&distro=focal

Affected ranges

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

Affected versions

3.*
3.0.1-4
3.0.1-4.1ubuntu1
3.0.1-5
3.1.1-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "python3-h2",
            "binary_version": "3.1.1-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-57804.json"
Ubuntu:22.04:LTS
python-h2

Package

Name
python-h2
Purl
pkg:deb/ubuntu/python-h2@4.1.0-3ubuntu1?arch=source&distro=jammy

Affected ranges

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

Affected versions

4.*
4.0.0-3
4.1.0-3ubuntu1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "python3-h2",
            "binary_version": "4.1.0-3ubuntu1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-57804.json"
Ubuntu:24.04:LTS
python-h2

Package

Name
python-h2
Purl
pkg:deb/ubuntu/python-h2@4.1.0-4?arch=source&distro=noble

Affected ranges

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

Affected versions

4.*
4.1.0-4

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "python3-h2",
            "binary_version": "4.1.0-4"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-57804.json"
Ubuntu:25.10
python-h2

Package

Name
python-h2
Purl
pkg:deb/ubuntu/python-h2@4.2.0-1?arch=source&distro=questing

Affected ranges

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

Affected versions

4.*
4.1.0-4
4.2.0-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "python3-h2",
            "binary_version": "4.2.0-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-57804.json"
Ubuntu:26.04
python-h2

Package

Name
python-h2
Purl
pkg:deb/ubuntu/python-h2@4.3.0-1?arch=source&distro=resolute

Affected ranges

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

Affected versions

4.*
4.2.0-1
4.3.0-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "python3-h2",
            "binary_version": "4.3.0-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-57804.json"