UBUNTU-CVE-2025-43859

See a problem?
Please try reporting it to the source first.
Source
https://ubuntu.com/security/CVE-2025-43859
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-43859.json
JSON Data
https://api.test.osv.dev/v1/vulns/UBUNTU-CVE-2025-43859
Related
Published
2025-04-24T19:15:00Z
Modified
2025-05-26T16:37:02Z
Summary
[none]
Details

h11 is a Python implementation of HTTP/1.1. Prior to version 0.16.0, a leniency in h11's parsing of line terminators in chunked-coding message bodies can lead to request smuggling vulnerabilities under certain conditions. This issue has been patched in version 0.16.0. Since exploitation requires the combination of buggy h11 with a buggy (reverse) proxy, fixing either component is sufficient to mitigate this issue.

References

Affected packages

Ubuntu:24.10 / python-h11

Package

Name
python-h11
Purl
pkg:deb/ubuntu/python-h11@0.14.0-1ubuntu0.24.10.1?arch=source&distro=oracular

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
0.14.0-1ubuntu0.24.10.1

Affected versions

0.*

0.14.0-1

Ecosystem specific 

{
    "availability": "No subscription required",
    "ubuntu_priority": "medium",
    "binaries": [
        {
            "binary_version": "0.14.0-1ubuntu0.24.10.1",
            "binary_name": "python3-h11"
        }
    ]
}

Ubuntu:24.04:LTS / python-h11

Package

Name
python-h11
Purl
pkg:deb/ubuntu/python-h11@0.14.0-1ubuntu0.24.04.1?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
0.14.0-1ubuntu0.24.04.1

Affected versions

0.*

0.14.0-1

Ecosystem specific 

{
    "availability": "No subscription required",
    "ubuntu_priority": "medium",
    "binaries": [
        {
            "binary_version": "0.14.0-1ubuntu0.24.04.1",
            "binary_name": "python3-h11"
        }
    ]
}

Ubuntu:25.04 / python-h11

Package

Name
python-h11
Purl
pkg:deb/ubuntu/python-h11@0.14.0-1ubuntu0.25.04.1?arch=source&distro=plucky

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
0.14.0-1ubuntu0.25.04.1

Affected versions

0.*

0.14.0-1

Ecosystem specific 

{
    "availability": "No subscription required",
    "ubuntu_priority": "medium",
    "binaries": [
        {
            "binary_version": "0.14.0-1ubuntu0.25.04.1",
            "binary_name": "python3-h11"
        }
    ]
}