Upstream information
Description
urllib3 is an HTTP client library for Python. urllib3's streaming API is designed for the efficient handling of large HTTP responses by reading the content in chunks, rather than loading the entire response body into memory at once. urllib3 can perform decoding or decompression based on the HTTP `Content-Encoding` header (e.g., `gzip`, `deflate`, `br`, or `zstd`). When using the streaming API, the library decompresses only the necessary bytes, enabling partial content consumption. Starting in version 1.22 and prior to version 2.6.3, for HTTP redirect responses, the library would read the entire response body to drain the connection and decompress the content unnecessarily. This decompression occurred even before any read methods were called, and configured read limits did not restrict the amount of decompressed data. As a result, there was no safeguard against decompression bombs. A malicious server could exploit this to trigger excessive resource consumption on the client. Applications and libraries are affected when they stream content from untrusted sources by setting `preload_content=False` when they do not disable redirects. Users should upgrade to at least urllib3 v2.6.3, in which the library does not decode content of redirect responses when `preload_content=False`. If upgrading is not immediately possible, disable redirects by setting `redirect=False` for requests to untrusted source.SUSE information
Overall state of this security issue: Pending
This issue is currently rated as having moderate severity.
| CVSS detail | SUSE |
|---|---|
| Base Score | 4.3 |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L |
| Attack Vector | Network |
| Attack Complexity | Low |
| Privileges Required | None |
| User Interaction | Required |
| Scope | Unchanged |
| Confidentiality Impact | None |
| Integrity Impact | None |
| Availability Impact | Low |
| CVSSv3 Version | 3.1 |
| CVSS detail | CNA (GitHub) | SUSE |
|---|---|---|
| Base Score | 8.9 | 2.3 |
| Vector | CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H/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:P/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N |
| Attack Vector | Network | Network |
| Attack Complexity | Low | Low |
| Attack Requirements | Present | Present |
| Privileges Required | None | None |
| User Interaction | None | Passive |
| Vulnerable System Confidentiality Impact | None | None |
| Vulnerable System Integrity Impact | None | None |
| Vulnerable System Availability Impact | High | Low |
| Subsequent System Confidentiality Impact | None | None |
| Subsequent System Integrity Impact | None | None |
| Subsequent System Availability Impact | High | None |
| CVSSv4 Version | 4.0 | 4.0 |
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-urllib3 | Affected |
| SUSE Linux Enterprise Desktop 15 SP7 | python-urllib3_1 | Affected |
| SUSE Linux Enterprise High Performance Computing 12 | python-urllib3 | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP7 | python-urllib3 | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP7 | python-urllib3_1 | Affected |
| SUSE Linux Enterprise Micro 5.2 | python-urllib3 | Affected |
| SUSE Linux Enterprise Micro 5.3 | python-urllib3 | Affected |
| SUSE Linux Enterprise Micro 5.4 | python-urllib3 | Affected |
| SUSE Linux Enterprise Micro 5.5 | python-urllib3 | Affected |
| SUSE Linux Enterprise Module for Basesystem 15 SP7 | python-urllib3 | Affected |
| SUSE Linux Enterprise Module for Python 3 15 SP7 | python-urllib3 | Affected |
| SUSE Linux Enterprise Module for Python 3 15 SP7 | python-urllib3_1 | Affected |
| SUSE Linux Enterprise Server 15 SP7 | python-urllib3 | Affected |
| SUSE Linux Enterprise Server 15 SP7 | python-urllib3_1 | Affected |
| SUSE Linux Enterprise Server 16.0 | python-urllib3 | Affected |
| SUSE Linux Enterprise Server 16.0 | python-urllib3_1 | Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP7 | python-urllib3 | Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP7 | python-urllib3_1 | Affected |
| SUSE Linux Enterprise Server for SAP applications 16.0 | python-urllib3 | Affected |
| SUSE Linux Enterprise Server for SAP applications 16.0 | python-urllib3_1 | Affected |
| SUSE Linux Micro 6.0 | python-urllib3 | Affected |
| SUSE Linux Micro 6.1 | python-urllib3 | Affected |
| SUSE Linux Micro 6.2 | python-urllib3 | Affected |
| Products under Long Term Service Pack support and receiving important and critical security fixes. | ||
| SUSE Linux Enterprise High Performance Computing 15 SP4 | python-urllib3 | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS | python-urllib3 | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP5 | python-urllib3 | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS | python-urllib3 | Affected |
| SUSE Linux Enterprise Module for Basesystem 15 SP4 | python-urllib3 | Affected |
| SUSE Linux Enterprise Module for Basesystem 15 SP5 | python-urllib3 | Affected |
| SUSE Linux Enterprise Module for Basesystem 15 SP6 | python-urllib3 | Affected |
| SUSE Linux Enterprise Module for Public Cloud 12 | python-urllib3 | Affected |
| SUSE Linux Enterprise Module for Public Cloud 15 SP4 | python-urllib3 | Affected |
| SUSE Linux Enterprise Module for Python 3 15 SP4 | python-urllib3 | Affected |
| SUSE Linux Enterprise Module for Python 3 15 SP5 | python-urllib3 | Affected |
| SUSE Linux Enterprise Server 12 SP5 | python-urllib3 | Affected |
| SUSE Linux Enterprise Server 12 SP5-LTSS | python-urllib3 | Affected |
| SUSE Linux Enterprise Server 12 SP5-LTSS Extended Security | python-urllib3 | Affected |
| SUSE Linux Enterprise Server 15 SP4 | python-urllib3 | Affected |
| SUSE Linux Enterprise Server 15 SP4-LTSS | python-urllib3 | Affected |
| SUSE Linux Enterprise Server 15 SP5 | python-urllib3 | Affected |
| SUSE Linux Enterprise Server 15 SP5-LTSS | python-urllib3 | Affected |
| SUSE Linux Enterprise Server 15 SP6-LTSS | python-urllib3 | Affected |
| SUSE Linux Enterprise Server 15 SP6-LTSS | python-urllib3_1 | Affected |
| SUSE Linux Enterprise Server LTSS Extended Security 12 SP5 | python-urllib3 | Affected |
| SUSE Linux Enterprise Server for SAP Applications 12 SP5 | python-urllib3 | Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP6 | python-urllib3 | Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP6 | python-urllib3_1 | Affected |
| SUSE Manager Proxy 4.3 | python-urllib3 | Affected |
| SUSE Manager Proxy LTS 4.3 | python-urllib3 | Affected |
| SUSE Manager Retail Branch Server 4.3 | python-urllib3 | Affected |
| SUSE Manager Retail Branch Server LTS 4.3 | python-urllib3 | Affected |
| SUSE Manager Server 4.3 | python-urllib3 | Affected |
| SUSE Manager Server LTS 4.3 | python-urllib3 | Affected |
| Products past their end of life and not receiving proactive updates anymore. | ||
| HPE Helion OpenStack 8 | python-urllib3 | Affected |
| SUSE CaaS Platform 3.0 | python-urllib3 | Affected |
| SUSE CaaS Platform 4.0 | python-urllib3 | Affected |
| SUSE Enterprise Storage 3 | python-urllib3 | Affected |
| SUSE Enterprise Storage 4 | python-urllib3 | Affected |
| SUSE Enterprise Storage 5 | python-urllib3 | Affected |
| SUSE Enterprise Storage 6 | python-urllib3 | Affected |
| SUSE Enterprise Storage 7 | python-urllib3 | Affected |
| SUSE Enterprise Storage 7.1 | python-urllib3 | Affected |
| SUSE Linux Enterprise Desktop 15 SP1 | python-urllib3 | Affected |
| SUSE Linux Enterprise Desktop 15 SP2 | python-urllib3 | Affected |
| SUSE Linux Enterprise Desktop 15 SP3 | python-urllib3 | Affected |
| SUSE Linux Enterprise Desktop 15 SP4 | python-urllib3 | Affected |
| SUSE Linux Enterprise Desktop 15 SP5 | python-urllib3 | Affected |
| SUSE Linux Enterprise Desktop 15 SP6 | python-urllib3 | Affected |
| SUSE Linux Enterprise Desktop 15 SP6 | python-urllib3_1 | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP1 | python-urllib3 | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP1-ESPOS | python-urllib3 | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP1-LTSS | python-urllib3 | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP2 | python-urllib3 | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP2-ESPOS | python-urllib3 | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP2-LTSS | python-urllib3 | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP3 | python-urllib3 | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP3-ESPOS | python-urllib3 | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP3-LTSS | python-urllib3 | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS | python-urllib3 | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS | python-urllib3 | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP6 | python-urllib3 | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP6 | python-urllib3_1 | Affected |
| SUSE Linux Enterprise Micro 5.0 | python-urllib3 | Affected |
| SUSE Linux Enterprise Micro 5.1 | python-urllib3 | Affected |
| SUSE Linux Enterprise Module for Basesystem 15 SP1 | python-urllib3 | Affected |
| SUSE Linux Enterprise Module for Basesystem 15 SP2 | python-urllib3 | Affected |
| SUSE Linux Enterprise Module for Basesystem 15 SP3 | python-urllib3 | Affected |
| SUSE Linux Enterprise Module for Python 2 15 SP1 | python-urllib3 | Affected |
| SUSE Linux Enterprise Module for Python 2 15 SP2 | python-urllib3 | Affected |
| SUSE Linux Enterprise Module for Python 2 15 SP3 | python-urllib3 | Affected |
| SUSE Linux Enterprise Module for Python 3 15 SP6 | python-urllib3 | Affected |
| SUSE Linux Enterprise Module for Python 3 15 SP6 | python-urllib3_1 | Affected |
| SUSE Linux Enterprise Point of Sale 12 SP2-CLIENT | python-urllib3 | Affected |
| SUSE Linux Enterprise Real Time 15 SP2 | python-urllib3 | Affected |
| SUSE Linux Enterprise Real Time 15 SP3 | python-urllib3 | Affected |
| SUSE Linux Enterprise Real Time 15 SP4 | python-urllib3 | Affected |
| SUSE Linux Enterprise Server 12 | python-urllib3 | Affected |
| SUSE Linux Enterprise Server 12 SP2-BCL | python-urllib3 | Affected |
| SUSE Linux Enterprise Server 12 SP2-ESPOS | python-urllib3 | Affected |
| SUSE Linux Enterprise Server 12 SP2-LTSS | python-urllib3 | Affected |
| SUSE Linux Enterprise Server 12 SP3 | python-urllib3 | Affected |
| SUSE Linux Enterprise Server 12 SP3-BCL | python-urllib3 | Affected |
| SUSE Linux Enterprise Server 12 SP3-ESPOS | python-urllib3 | Affected |
| SUSE Linux Enterprise Server 12 SP3-LTSS | python-urllib3 | Affected |
| SUSE Linux Enterprise Server 12 SP4 | python-urllib3 | Affected |
| SUSE Linux Enterprise Server 12 SP4-ESPOS | python-urllib3 | Affected |
| SUSE Linux Enterprise Server 12 SP4-LTSS | python-urllib3 | Affected |
| SUSE Linux Enterprise Server 15 SP1 | python-urllib3 | Affected |
| SUSE Linux Enterprise Server 15 SP1-BCL | python-urllib3 | Affected |
| SUSE Linux Enterprise Server 15 SP1-LTSS | python-urllib3 | Affected |
| SUSE Linux Enterprise Server 15 SP2 | python-urllib3 | Affected |
| SUSE Linux Enterprise Server 15 SP2-BCL | python-urllib3 | Affected |
| SUSE Linux Enterprise Server 15 SP2-LTSS | python-urllib3 | Affected |
| SUSE Linux Enterprise Server 15 SP3 | python-urllib3 | Affected |
| SUSE Linux Enterprise Server 15 SP3-BCL | python-urllib3 | Affected |
| SUSE Linux Enterprise Server 15 SP3-LTSS | python-urllib3 | Affected |
| SUSE Linux Enterprise Server 15 SP6 | python-urllib3 | Affected |
| SUSE Linux Enterprise Server 15 SP6 | python-urllib3_1 | Affected |
| SUSE Linux Enterprise Server for SAP Applications 12 | python-urllib3 | Affected |
| SUSE Linux Enterprise Server for SAP Applications 12 SP2 | python-urllib3 | Affected |
| SUSE Linux Enterprise Server for SAP Applications 12 SP3 | python-urllib3 | Affected |
| SUSE Linux Enterprise Server for SAP Applications 12 SP4 | python-urllib3 | Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP1 | python-urllib3 | Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP2 | python-urllib3 | Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP3 | python-urllib3 | Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP4 | python-urllib3 | Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP5 | python-urllib3 | Affected |
| SUSE Linux Enterprise Software Development Kit 12 SP5 | python-urllib3 | Affected |
| SUSE Linux Enterprise Workstation Extension 12 SP5 | python-urllib3 | Affected |
| SUSE Manager Proxy 3.2 | python-urllib3 | Affected |
| SUSE Manager Proxy 4.0 | python-urllib3 | Affected |
| SUSE Manager Proxy 4.1 | python-urllib3 | Affected |
| SUSE Manager Proxy 4.2 | python-urllib3 | Affected |
| SUSE Manager Retail Branch Server 4.0 | python-urllib3 | Affected |
| SUSE Manager Retail Branch Server 4.1 | python-urllib3 | Affected |
| SUSE Manager Retail Branch Server 4.2 | python-urllib3 | Affected |
| SUSE Manager Server 3.1 | python-urllib3 | Affected |
| SUSE Manager Server 3.2 | python-urllib3 | Affected |
| SUSE Manager Server 4.0 | python-urllib3 | Affected |
| SUSE Manager Server 4.1 | python-urllib3 | Affected |
| SUSE Manager Server 4.2 | python-urllib3 | Affected |
| SUSE OpenStack Cloud 7 | python-urllib3 | Affected |
| SUSE OpenStack Cloud 8 | python-urllib3 | Affected |
| SUSE OpenStack Cloud 9 | python-urllib3 | Affected |
| SUSE OpenStack Cloud Crowbar 8 | python-urllib3 | Affected |
| SUSE OpenStack Cloud Crowbar 9 | python-urllib3 | Affected |
| openSUSE Leap 15.3 | python-urllib3 | Affected |
| openSUSE Leap 15.4 | python-urllib3 | Affected |
| openSUSE Leap 15.5 | python-urllib3 | Affected |
| openSUSE Leap 15.6 | python-urllib3 | Affected |
| openSUSE Leap 15.6 | python-urllib3_1 | Affected |
| openSUSE Leap Micro 5.2 | python-urllib3 | Affected |
| openSUSE Leap Micro 5.3 | python-urllib3 | Affected |
| openSUSE Leap Micro 5.4 | python-urllib3 | Affected |
| openSUSE Leap Micro 5.5 | python-urllib3 | Affected |
| Products at an unknown state of their lifecycle. | ||
| SUSE Linux Enterprise Server for SAP Applications 16.0 | python-urllib3 | Affected |
| SUSE Linux Enterprise Server for SAP Applications 16.0 | python-urllib3_1 | Affected |
SUSE Timeline for this CVE
CVE page created: Thu Jan 8 00:03:01 2026CVE page last modified: Fri Jan 9 12:57:58 2026