Upstream information

CVE-2026-45409 at MITRE

Description

Internationalized Domain Names in Applications (IDNA) for Python provides support for Internationalized Domain Names in Applications (IDNA) and Unicode IDNA Compatibility Processing. In versions prior to 3.15, payloads such as `"\u0660" * N` or `"\u30fb" * N + "\u6f22"` utilize the `valid_contexto` function prior to length rejection, and for high values of `N` will take a long time to process. This is the same issue as CVE-2024-3651, however the original remediation in 2024 was not a complete fix. A specially crafted argument to the `idna.encode()` function could consume significant resources. This may lead to a denial-of-service. Starting in version 3.14, the function rejects long inputs as soon as practicable prior to any further processing to minimize resource consumption. In version 3.15, this approach was extended to lesser used alternate functions (i.e. per-label conversions and codec support). A workaround is available. Domain names cannot exceed 253 characters in length. If this length limit is enforced prior to passing the domain to the `idna.encode()` function, it should no longer consume significant resources. This is triggered by arbitrarily large inputs that would not occur in normal usage, but may be passed to the library assuming there is no preliminary input validation by the higher-level application.

SUSE information

Overall state of this security issue: Pending

This issue is currently rated as having moderate severity.

CVSS v3 Scores
CVSS detail SUSE
Base Score 5.3
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality Impact Low
Integrity Impact None
Availability Impact None
CVSSv3 Version 3.1
CVSS v4 Scores
CVSS detail CNA (GitHub) SUSE
Base Score 6.9 6.9
Vector 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
Attack Vector Network Network
Attack Complexity Low Low
Attack Requirements None None
Privileges Required None None
User Interaction None None
Vulnerable System Confidentiality Impact None Low
Vulnerable System Integrity Impact None None
Vulnerable System Availability Impact Low None
Subsequent System Confidentiality Impact None None
Subsequent System Integrity Impact None None
Subsequent System Availability Impact None None
CVSSv4 Version 4.0 4.0
SUSE Bugzilla entry: 1265413 [NEW]

SUSE Security Advisories:

List of released packages

Product(s) Fixed package version(s) References
SUSE Linux Micro 6.0
  • python311-idna >= 3.4-9.1
 Patchnames:
SUSE-SLE-Micro-6.0-733
SUSE Linux Micro 6.1
  • python311-idna >= 3.7-slfo.1.1_2.1
 Patchnames:
SUSE-SLE-Micro-6.1-553
openSUSE Tumbleweed
  • python311-idna >= 3.15-1.1
  • python313-idna >= 3.15-1.1
  • python314-idna >= 3.15-1.1
 Patchnames:
openSUSE-Tumbleweed-2026-10829

List of packages in QA

Product(s) Package(s)
SUSE Linux Enterprise Micro 5.3
  • python3-idna >= 2.6-150000.3.9.1
SUSE Linux Enterprise Micro 5.4
  • python3-idna >= 2.6-150000.3.9.1
SUSE Linux Enterprise Micro 5.5
  • python3-idna >= 2.6-150000.3.9.1
SUSE Linux Enterprise Module for Basesystem 15 SP7
  • python3-idna >= 2.6-150000.3.9.1
SUSE Linux Enterprise Server 15 SP7
  • python3-idna >= 2.6-150000.3.9.1
SUSE Linux Enterprise Desktop 15 SP7
  • python3-idna >= 2.6-150000.3.9.1
SUSE Linux Enterprise Server for SAP Applications 15 SP7
  • python3-idna >= 2.6-150000.3.9.1
SUSE Linux Enterprise High Performance Computing 15 SP7
  • python3-idna >= 2.6-150000.3.9.1
SUSE Linux Enterprise Module for Public Cloud 12
  • python-idna >= 2.5-3.16.1
  • python3-idna >= 2.5-3.16.1
SUSE Linux Enterprise Server 12
  • python-idna >= 2.5-3.16.1
  • python3-idna >= 2.5-3.16.1
SUSE Linux Enterprise Server for SAP Applications 12
  • python-idna >= 2.5-3.16.1
  • python3-idna >= 2.5-3.16.1
SUSE Linux Enterprise High Performance Computing 12
  • python-idna >= 2.5-3.16.1
  • python3-idna >= 2.5-3.16.1
SUSE Linux Enterprise Server 12 SP3
  • python-idna >= 2.5-3.16.1
  • python3-idna >= 2.5-3.16.1
SUSE Linux Enterprise Server for SAP Applications 12 SP3
  • python-idna >= 2.5-3.16.1
  • python3-idna >= 2.5-3.16.1
SUSE Linux Enterprise Server 12 SP4
  • python-idna >= 2.5-3.16.1
  • python3-idna >= 2.5-3.16.1
SUSE Linux Enterprise Server for SAP Applications 12 SP4
  • python-idna >= 2.5-3.16.1
  • python3-idna >= 2.5-3.16.1
SUSE Linux Enterprise Server 12 SP5
  • python-idna >= 2.5-3.16.1
  • python3-idna >= 2.5-3.16.1
SUSE Linux Enterprise Server for SAP Applications 12 SP5
  • python-idna >= 2.5-3.16.1
  • python3-idna >= 2.5-3.16.1
SUSE Linux Enterprise Module for Public Cloud 15 SP4
  • python311-idna >= 3.4-150400.11.13.1
SUSE Linux Enterprise Server 15 SP4
  • python311-idna >= 3.4-150400.11.13.1
SUSE Linux Enterprise Server for SAP Applications 15 SP4
  • python311-idna >= 3.4-150400.11.13.1
SUSE Linux Enterprise High Performance Computing 15 SP4
  • python311-idna >= 3.4-150400.11.13.1
SUSE Manager Server 4.3
  • python311-idna >= 3.4-150400.11.13.1
SUSE Manager Proxy 4.3
  • python311-idna >= 3.4-150400.11.13.1
SUSE Manager Retail Branch Server 4.3
  • python311-idna >= 3.4-150400.11.13.1
SUSE Linux Enterprise Module for Python 3 15 SP7
  • python311-idna >= 3.4-150400.11.13.1
SUSE Linux Enterprise Server 15 SP7
  • python311-idna >= 3.4-150400.11.13.1
SUSE Linux Enterprise Desktop 15 SP7
  • python311-idna >= 3.4-150400.11.13.1
SUSE Linux Enterprise Server for SAP Applications 15 SP7
  • python311-idna >= 3.4-150400.11.13.1
SUSE Linux Enterprise High Performance Computing 15 SP7
  • python311-idna >= 3.4-150400.11.13.1
SUSE Linux Enterprise Server LTSS Extended Security 12 SP5
  • python-idna >= 2.5-3.16.1
  • python3-idna >= 2.5-3.16.1

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 SP7 python-idna In progress
SUSE Linux Enterprise High Performance Computing 12 python-idna In progress
SUSE Linux Enterprise High Performance Computing 15 SP7 python-idna In progress
SUSE Linux Enterprise Micro 5.3 python-idna In progress
SUSE Linux Enterprise Micro 5.4 python-idna In progress
SUSE Linux Enterprise Micro 5.5 python-idna In progress
SUSE Linux Enterprise Module for Basesystem 15 SP7 python-idna In progress
SUSE Linux Enterprise Module for Python 3 15 SP7 python-idna In progress
SUSE Linux Enterprise Server 15 SP7 python-idna In progress
SUSE Linux Enterprise Server 16.0 python-idna In progress
SUSE Linux Enterprise Server 16.1 python-idna Affected
SUSE Linux Enterprise Server for SAP Applications 15 SP7 python-idna In progress
SUSE Linux Enterprise Server for SAP applications 16.0 python-idna In progress
SUSE Linux Enterprise Server for SAP applications 16.1 python-idna Affected
SUSE Linux Micro 6.0 python-idna Released
SUSE Linux Micro 6.1 python-idna Released
SUSE Linux Micro 6.2 python-idna In progress
openSUSE Leap 16.0 python-idna Affected
Products under Long Term Service Pack support and receiving important and critical security fixes.
SUSE Linux Enterprise High Performance Computing 15 SP4 python-idna In progress
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS python-idna Affected
SUSE Linux Enterprise High Performance Computing 15 SP5 python-idna Affected
SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS python-idna Affected
SUSE Linux Enterprise Module for Basesystem 15 SP4 python-idna Affected
SUSE Linux Enterprise Module for Basesystem 15 SP5 python-idna Affected
SUSE Linux Enterprise Module for Basesystem 15 SP6 python-idna Affected
SUSE Linux Enterprise Module for Public Cloud 12 python-idna In progress
SUSE Linux Enterprise Module for Public Cloud 15 SP4 python-idna In progress
SUSE Linux Enterprise Module for Python 3 15 SP4 python-idna Affected
SUSE Linux Enterprise Module for Python 3 15 SP5 python-idna Affected
SUSE Linux Enterprise Module for Python 3 15 SP6 python-idna Affected
SUSE Linux Enterprise Server 12 SP5 python-idna In progress
SUSE Linux Enterprise Server 12 SP5-LTSS python-idna Affected
SUSE Linux Enterprise Server 12 SP5-LTSS Extended Security python-idna Affected
SUSE Linux Enterprise Server 15 SP4 python-idna In progress
SUSE Linux Enterprise Server 15 SP4-LTSS python-idna Affected
SUSE Linux Enterprise Server 15 SP5 python-idna Affected
SUSE Linux Enterprise Server 15 SP5-LTSS python-idna Affected
SUSE Linux Enterprise Server 15 SP6 python-idna Affected
SUSE Linux Enterprise Server 15 SP6-LTSS python-idna Affected
SUSE Linux Enterprise Server LTSS Extended Security 12 SP5 python-idna In progress
SUSE Linux Enterprise Server for SAP Applications 12 SP5 python-idna In progress
SUSE Linux Enterprise Server for SAP Applications 15 SP6 python-idna Affected
SUSE Manager Proxy 4.3 python-idna In progress
SUSE Manager Proxy LTS 4.3 python-idna Affected
SUSE Manager Retail Branch Server 4.3 python-idna In progress
SUSE Manager Retail Branch Server LTS 4.3 python-idna Affected
SUSE Manager Server 4.3 python-idna In progress
SUSE Manager Server LTS 4.3 python-idna Affected
Products past their end of life and not receiving proactive updates anymore.
HPE Helion OpenStack 8 python-idna Affected
SUSE CaaS Platform 3.0 python-idna Affected
SUSE CaaS Platform 4.0 python-idna Affected
SUSE Enterprise Storage 6 python-idna Affected
SUSE Enterprise Storage 7 python-idna Affected
SUSE Enterprise Storage 7.1 python-idna Affected
SUSE Linux Enterprise Desktop 12 SP1 python-idna Affected
SUSE Linux Enterprise Desktop 12 SP2 python-idna Affected
SUSE Linux Enterprise Desktop 12 SP3 python-idna Affected
SUSE Linux Enterprise Desktop 12 SP4 python-idna Affected
SUSE Linux Enterprise Desktop 15 python-idna Affected
SUSE Linux Enterprise Desktop 15 SP1 python-idna Affected
SUSE Linux Enterprise Desktop 15 SP2 python-idna Affected
SUSE Linux Enterprise Desktop 15 SP3 python-idna Affected
SUSE Linux Enterprise Desktop 15 SP4 python-idna Affected
SUSE Linux Enterprise Desktop 15 SP5 python-idna Affected
SUSE Linux Enterprise Desktop 15 SP6 python-idna Affected
SUSE Linux Enterprise High Performance Computing 15 python-idna Affected
SUSE Linux Enterprise High Performance Computing 15 SP1 python-idna Affected
SUSE Linux Enterprise High Performance Computing 15 SP1-ESPOS python-idna Affected
SUSE Linux Enterprise High Performance Computing 15 SP1-LTSS python-idna Affected
SUSE Linux Enterprise High Performance Computing 15 SP2 python-idna Affected
SUSE Linux Enterprise High Performance Computing 15 SP2-ESPOS python-idna Affected
SUSE Linux Enterprise High Performance Computing 15 SP2-LTSS python-idna Affected
SUSE Linux Enterprise High Performance Computing 15 SP3 python-idna Affected
SUSE Linux Enterprise High Performance Computing 15 SP3-ESPOS python-idna Affected
SUSE Linux Enterprise High Performance Computing 15 SP3-LTSS python-idna Affected
SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS python-idna Affected
SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS python-idna Affected
SUSE Linux Enterprise High Performance Computing 15 SP6 python-idna Affected
SUSE Linux Enterprise High Performance Computing 15-ESPOS python-idna Affected
SUSE Linux Enterprise High Performance Computing 15-LTSS python-idna Affected
SUSE Linux Enterprise Micro 5.0 python-idna Affected
SUSE Linux Enterprise Micro 5.1 python-idna Affected
SUSE Linux Enterprise Micro 5.2 python-idna Affected
SUSE Linux Enterprise Module for Basesystem 15 python-idna Affected
SUSE Linux Enterprise Module for Basesystem 15 SP1 python-idna Affected
SUSE Linux Enterprise Module for Basesystem 15 SP2 python-idna Affected
SUSE Linux Enterprise Module for Basesystem 15 SP3 python-idna Affected
SUSE Linux Enterprise Module for Python 2 15 SP1 python-idna Affected
SUSE Linux Enterprise Module for Python 2 15 SP2 python-idna Affected
SUSE Linux Enterprise Module for Python 2 15 SP3 python-idna Affected
SUSE Linux Enterprise Point of Sale 12 SP2-CLIENT python-idna Affected
SUSE Linux Enterprise Real Time 15 SP2 python-idna Affected
SUSE Linux Enterprise Real Time 15 SP3 python-idna Affected
SUSE Linux Enterprise Real Time 15 SP4 python-idna Affected
SUSE Linux Enterprise Server 12 python-idna In progress
SUSE Linux Enterprise Server 12 SP1 python-idna Affected
SUSE Linux Enterprise Server 12 SP1-LTSS python-idna Affected
SUSE Linux Enterprise Server 12 SP2 python-idna Affected
SUSE Linux Enterprise Server 12 SP2-BCL python-idna Affected
SUSE Linux Enterprise Server 12 SP2-ESPOS python-idna Affected
SUSE Linux Enterprise Server 12 SP2-LTSS python-idna Affected
SUSE Linux Enterprise Server 12 SP3 python-idna In progress
SUSE Linux Enterprise Server 12 SP3-BCL python-idna Affected
SUSE Linux Enterprise Server 12 SP3-ESPOS python-idna Affected
SUSE Linux Enterprise Server 12 SP3-LTSS python-idna Affected
SUSE Linux Enterprise Server 12 SP4 python-idna In progress
SUSE Linux Enterprise Server 12 SP4-ESPOS python-idna Affected
SUSE Linux Enterprise Server 12 SP4-LTSS python-idna Affected
SUSE Linux Enterprise Server 15 python-idna Affected
SUSE Linux Enterprise Server 15 SP1 python-idna Affected
SUSE Linux Enterprise Server 15 SP1-BCL python-idna Affected
SUSE Linux Enterprise Server 15 SP1-LTSS python-idna Affected
SUSE Linux Enterprise Server 15 SP2 python-idna Affected
SUSE Linux Enterprise Server 15 SP2-BCL python-idna Affected
SUSE Linux Enterprise Server 15 SP2-LTSS python-idna Affected
SUSE Linux Enterprise Server 15 SP3 python-idna Affected
SUSE Linux Enterprise Server 15 SP3-BCL python-idna Affected
SUSE Linux Enterprise Server 15 SP3-LTSS python-idna Affected
SUSE Linux Enterprise Server 15-LTSS python-idna Affected
SUSE Linux Enterprise Server for Raspberry Pi 12 SP2 python-idna Affected
SUSE Linux Enterprise Server for SAP Applications 12 python-idna In progress
SUSE Linux Enterprise Server for SAP Applications 12 SP1 python-idna Affected
SUSE Linux Enterprise Server for SAP Applications 12 SP2 python-idna Affected
SUSE Linux Enterprise Server for SAP Applications 12 SP3 python-idna In progress
SUSE Linux Enterprise Server for SAP Applications 12 SP4 python-idna In progress
SUSE Linux Enterprise Server for SAP Applications 15 python-idna Affected
SUSE Linux Enterprise Server for SAP Applications 15 SP1 python-idna Affected
SUSE Linux Enterprise Server for SAP Applications 15 SP2 python-idna Affected
SUSE Linux Enterprise Server for SAP Applications 15 SP3 python-idna Affected
SUSE Linux Enterprise Server for SAP Applications 15 SP4 python-idna In progress
SUSE Linux Enterprise Server for SAP Applications 15 SP5 python-idna Affected
SUSE Manager Proxy 4.0 python-idna Affected
SUSE Manager Proxy 4.1 python-idna Affected
SUSE Manager Proxy 4.2 python-idna Affected
SUSE Manager Retail Branch Server 4.0 python-idna Affected
SUSE Manager Retail Branch Server 4.1 python-idna Affected
SUSE Manager Retail Branch Server 4.2 python-idna Affected
SUSE Manager Server 4.0 python-idna Affected
SUSE Manager Server 4.1 python-idna Affected
SUSE Manager Server 4.2 python-idna Affected
SUSE OpenStack Cloud 7 python-idna Affected
SUSE OpenStack Cloud 8 python-idna Affected
SUSE OpenStack Cloud 9 python-idna Affected
SUSE OpenStack Cloud Crowbar 8 python-idna Affected
SUSE OpenStack Cloud Crowbar 9 python-idna Affected
openSUSE Leap 15.3 python-idna Affected
openSUSE Leap 15.4 python-idna Affected
openSUSE Leap 15.5 python-idna Affected
openSUSE Leap 15.6 python-idna Affected
openSUSE Leap Micro 5.2 python-idna Affected
openSUSE Leap Micro 5.3 python-idna Affected
openSUSE Leap Micro 5.4 python-idna Affected
openSUSE Leap Micro 5.5 python-idna Affected

SUSE Timeline for this CVE

CVE page created: Mon May 18 10:04:51 2026
CVE page last modified: Sat Jun 6 11:40:00 2026