Upstream information

CVE-2025-43859 at MITRE

Description

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.

SUSE information

Overall state of this security issue: Pending

This issue is currently rated as having critical severity.

CVSS v3 Scores
  CNA (GitHub) SUSE
Base Score 9.1 9.1
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Attack Vector Network Network
Attack Complexity Low Low
Privileges Required None None
User Interaction None None
Scope Unchanged Unchanged
Confidentiality Impact High High
Integrity Impact High High
Availability Impact None None
CVSSv3 Version 3.1 3.1
CVSS v4 Scores
  SUSE
Base Score 9.3
Vector CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
Attack Vector Network
Attack Complexity Low
Attack Requirements None
Privileges Required None
User Interaction None
Vulnerable System Confidentiality Impact High
Vulnerable System Integrity Impact High
Vulnerable System Availability Impact None
Subsequent System Confidentiality Impact None
Subsequent System Integrity Impact None
Subsequent System Availability Impact None
CVSSv4 Version 4.0
SUSE Bugzilla entry: 1241872 [IN_PROGRESS]

SUSE Security Advisories:

List of released packages

Product(s) Fixed package version(s) References
Container containers/open-webui:0.5.14-9.47
  • python311-h11 >= 0.14.0-150400.9.6.1
SUSE Linux Enterprise Desktop 15 SP6
SUSE Linux Enterprise High Performance Computing 15 SP6
SUSE Linux Enterprise Module for Python 3 15 SP6
SUSE Linux Enterprise Server 15 SP6
SUSE Linux Enterprise Server for SAP Applications 15 SP6
  • python311-h11 >= 0.14.0-150400.9.6.1
 Patchnames:
SUSE-SLE-Module-Python3-15-SP6-2025-1430
SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS
  • python311-h11 >= 0.14.0-150400.9.6.1
 Patchnames:
SUSE-SLE-Product-HPC-15-SP4-ESPOS-2025-1430
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS
  • python311-h11 >= 0.14.0-150400.9.6.1
 Patchnames:
SUSE-SLE-Product-HPC-15-SP4-LTSS-2025-1430
SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS
  • python311-h11 >= 0.14.0-150400.9.6.1
 Patchnames:
SUSE-SLE-Product-HPC-15-SP5-ESPOS-2025-1430
SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS
  • python311-h11 >= 0.14.0-150400.9.6.1
 Patchnames:
SUSE-SLE-Product-HPC-15-SP5-LTSS-2025-1430
SUSE Linux Enterprise Server 15 SP4-LTSS
  • python311-h11 >= 0.14.0-150400.9.6.1
 Patchnames:
SUSE-SLE-Product-SLES-15-SP4-LTSS-2025-1430
SUSE Linux Enterprise Server 15 SP5-LTSS
  • python311-h11 >= 0.14.0-150400.9.6.1
 Patchnames:
SUSE-SLE-Product-SLES-15-SP5-LTSS-2025-1430
SUSE Linux Enterprise Server for SAP Applications 15 SP4
  • python311-h11 >= 0.14.0-150400.9.6.1
 Patchnames:
SUSE-SLE-Product-SLES_SAP-15-SP4-2025-1430
SUSE Linux Enterprise Server for SAP Applications 15 SP5
  • python311-h11 >= 0.14.0-150400.9.6.1
 Patchnames:
SUSE-SLE-Product-SLES_SAP-15-SP5-2025-1430
openSUSE Leap 15.6
  • python311-h11 >= 0.14.0-150400.9.6.1
 Patchnames:
openSUSE-SLE-15.6-2025-1430
openSUSE Tumbleweed
  • python311-h11 >= 0.16.0-1.1
  • python312-h11 >= 0.16.0-1.1
  • python313-h11 >= 0.16.0-1.1
 Patchnames:
openSUSE-Tumbleweed-2025-15032

Status of this issue by product and package

Please note that this evaluation state might be work in progress, incomplete or outdated. Also information for service packs in the LTSS phase is only included for issues meeting the LTSS criteria. If in doubt, feel free to contact us for clarification. The updates are grouped by state of their lifecycle. SUSE product lifecycles are documented on the lifecycle page.

Product(s) Source package State
Products under general support and receiving all security fixes.
SUSE Linux Enterprise Desktop 15 SP6 python-h11 Released
SUSE Linux Enterprise Desktop 15 SP7 python-h11 Affected
SUSE Linux Enterprise High Performance Computing 15 SP6 python-h11 Released
SUSE Linux Enterprise High Performance Computing 15 SP7 python-h11 Affected
SUSE Linux Enterprise Module for Python 3 15 SP6 python-h11 Released
SUSE Linux Enterprise Module for Python 3 15 SP7 python-h11 Affected
SUSE Linux Enterprise Server 15 SP6 python-h11 Released
SUSE Linux Enterprise Server 15 SP7 python-h11 Affected
SUSE Linux Enterprise Server for SAP Applications 15 SP6 python-h11 Released
SUSE Linux Enterprise Server for SAP Applications 15 SP7 python-h11 Affected
SUSE Linux Micro 6.0 python-h11 Released
SUSE Linux Micro 6.0 python-httpcore Released
SUSE Linux Micro 6.1 python-h11 Released
SUSE Linux Micro 6.1 python-httpcore Released
SUSE Manager Proxy 4.3 python-h11 Affected
SUSE Manager Retail Branch Server 4.3 python-h11 Affected
SUSE Manager Server 4.3 python-h11 Affected
openSUSE Leap 15.6 python-h11 Released
Products under Long Term Service Pack support and receiving important and critical security fixes.
SUSE Linux Enterprise High Performance Computing 15 SP4 python-h11 Affected
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS python-h11 Released
SUSE Linux Enterprise High Performance Computing 15 SP5 python-h11 Affected
SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS python-h11 Released
SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS python-h11 Released
SUSE Linux Enterprise Module for Python 3 15 SP4 python-h11 Affected
SUSE Linux Enterprise Module for Python 3 15 SP5 python-h11 Affected
SUSE Linux Enterprise Server 15 SP4 python-h11 Affected
SUSE Linux Enterprise Server 15 SP4-LTSS python-h11 Released
SUSE Linux Enterprise Server 15 SP5 python-h11 Affected
SUSE Linux Enterprise Server 15 SP5-LTSS python-h11 Released
Products past their end of life and not receiving proactive updates anymore.
SUSE Linux Enterprise Desktop 15 SP4 python-h11 Affected
SUSE Linux Enterprise Desktop 15 SP5 python-h11 Affected
SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS python-h11 Released
SUSE Linux Enterprise Server for SAP Applications 15 SP4 python-h11 Released
SUSE Linux Enterprise Server for SAP Applications 15 SP5 python-h11 Released
openSUSE Leap 15.4 python-h11 Released
openSUSE Leap 15.5 python-h11 Affected

SUSE Timeline for this CVE

CVE page created: Thu Apr 24 22:00:43 2025
CVE page last modified: Wed May 21 12:20:25 2025