Upstream information
Description
urllib3 version 2.6.3 is vulnerable to a decompression bomb bypass in its streaming API (`preload_content=False`) when using Brotli support. The issue arises due to three independent code paths in `response.py` that bypass the `max_length` protection introduced in version 2.6.0 to mitigate CVE-2025-66471. Specifically, negative `max_length` values can be produced due to buffer arithmetic in `read()`, `flush_decoder` unconditionally overrides `max_length` to `-1`, and `_flush_decoder()` passes no limit at all, defaulting to unlimited decompression. This allows a malicious HTTP server to trigger an out-of-memory (OOM) condition by decompressing large payloads into memory, leading to a denial of service (DoS). The vulnerability affects urllib3 2.6.3 and Brotli 1.2.0 and impacts applications and libraries using `requests` or `urllib3` to stream content from untrusted sources.SUSE information
Overall state of this security issue: Pending
This issue is currently rated as having moderate severity.
| CVSS detail | CNA (Huntr.dev) | SUSE |
|---|---|---|
| Base Score | 7.5 | 6.8 |
| Vector | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H |
| Attack Vector | Network | Network |
| Attack Complexity | Low | High |
| Privileges Required | None | None |
| User Interaction | None | None |
| Scope | Unchanged | Changed |
| Confidentiality Impact | None | None |
| Integrity Impact | None | None |
| Availability Impact | High | High |
| CVSSv3 Version | 3 | 3.1 |
| CVSS detail | SUSE |
|---|---|
| Base Score | 8.9 |
| 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 |
| Attack Vector | Network |
| Attack Complexity | Low |
| Attack Requirements | Present |
| Privileges Required | None |
| User Interaction | None |
| Vulnerable System Confidentiality Impact | None |
| Vulnerable System Integrity Impact | None |
| Vulnerable System Availability Impact | High |
| Subsequent System Confidentiality Impact | None |
| Subsequent System Integrity Impact | None |
| Subsequent System Availability Impact | High |
| CVSSv4 Version | 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Please note that this evaluation state might be work in progress, incomplete or outdated.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 | Not affected |
| SUSE Linux Enterprise High Performance Computing 12 | python-urllib3 | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP7 | python-urllib3 | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP7 | python-urllib3_1 | Not affected |
| SUSE Linux Enterprise Micro 5.3 | python-urllib3 | Not affected |
| SUSE Linux Enterprise Micro 5.4 | python-urllib3 | Not affected |
| SUSE Linux Enterprise Micro 5.5 | python-urllib3 | Not affected |
| SUSE Linux Enterprise Module for Basesystem 15 SP7 | python-urllib3 | Not 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 | Not affected |
| SUSE Linux Enterprise Server 15 SP7 | python-urllib3 | Affected |
| SUSE Linux Enterprise Server 15 SP7 | python-urllib3_1 | Not affected |
| SUSE Linux Enterprise Server 16.0 | python-urllib3 | Affected |
| SUSE Linux Enterprise Server 16.0 | python-urllib3_1 | Not affected |
| SUSE Linux Enterprise Server 16.1 | python-urllib3 | Affected |
| SUSE Linux Enterprise Server 16.1 | python-urllib3_1 | Not 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 | Not 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 | Not affected |
| SUSE Linux Enterprise Server for SAP applications 16.1 | python-urllib3 | Affected |
| SUSE Linux Enterprise Server for SAP applications 16.1 | python-urllib3_1 | Not 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 |
| openSUSE Leap 16.0 | python-urllib3 | Affected |
| openSUSE Leap 16.0 | python-urllib3_1 | Not 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 | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP5 | python-urllib3 | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS | python-urllib3 | Not affected |
| SUSE Linux Enterprise Module for Basesystem 15 SP4 | python-urllib3 | Not affected |
| SUSE Linux Enterprise Module for Basesystem 15 SP5 | python-urllib3 | Not affected |
| SUSE Linux Enterprise Module for Basesystem 15 SP6 | python-urllib3 | Not affected |
| SUSE Linux Enterprise Module for Public Cloud 12 | python-urllib3 | Not 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 Module for Python 3 15 SP6 | python-urllib3 | Affected |
| SUSE Linux Enterprise Module for Python 3 15 SP6 | python-urllib3_1 | Not affected |
| SUSE Linux Enterprise Server 12 SP5 | python-urllib3 | Not affected |
| SUSE Linux Enterprise Server 12 SP5-LTSS | python-urllib3 | Not affected |
| SUSE Linux Enterprise Server 12 SP5-LTSS Extended Security | python-urllib3 | Not affected |
| SUSE Linux Enterprise Server 15 SP4 | python-urllib3 | Affected |
| SUSE Linux Enterprise Server 15 SP4-LTSS | python-urllib3 | Not affected |
| SUSE Linux Enterprise Server 15 SP5 | python-urllib3 | Not affected |
| SUSE Linux Enterprise Server 15 SP5-LTSS | python-urllib3 | Not affected |
| SUSE Linux Enterprise Server 15 SP6 | python-urllib3 | Not affected |
| SUSE Linux Enterprise Server 15 SP6 | python-urllib3_1 | Not affected |
| SUSE Linux Enterprise Server 15 SP6-LTSS | python-urllib3 | Not affected |
| SUSE Linux Enterprise Server 15 SP6-LTSS | python-urllib3_1 | Not affected |
| SUSE Linux Enterprise Server LTSS Extended Security 12 SP5 | python-urllib3 | Not affected |
| SUSE Linux Enterprise Server for SAP Applications 12 SP5 | python-urllib3 | Not affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP6 | python-urllib3 | Not affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP6 | python-urllib3_1 | Not affected |
| SUSE Manager Proxy 4.3 | python-urllib3 | Affected |
| SUSE Manager Proxy LTS 4.3 | python-urllib3 | Not affected |
| SUSE Manager Retail Branch Server 4.3 | python-urllib3 | Affected |
| SUSE Manager Retail Branch Server LTS 4.3 | python-urllib3 | Not affected |
| SUSE Manager Server 4.3 | python-urllib3 | Affected |
| SUSE Manager Server LTS 4.3 | python-urllib3 | Not affected |
| Products past their end of life and not receiving proactive updates anymore. | ||
| HPE Helion OpenStack 8 | python-urllib3 | Not affected |
| SUSE CaaS Platform 3.0 | python-urllib3 | Not affected |
| SUSE CaaS Platform 4.0 | python-urllib3 | Not affected |
| SUSE Enterprise Storage 3 | python-urllib3 | Not affected |
| SUSE Enterprise Storage 4 | python-urllib3 | Not affected |
| SUSE Enterprise Storage 5 | python-urllib3 | Not affected |
| SUSE Enterprise Storage 6 | python-urllib3 | Not affected |
| SUSE Enterprise Storage 7 | python-urllib3 | Not affected |
| SUSE Enterprise Storage 7.1 | python-urllib3 | Not affected |
| SUSE Linux Enterprise Desktop 15 SP1 | python-urllib3 | Not affected |
| SUSE Linux Enterprise Desktop 15 SP2 | python-urllib3 | Not affected |
| SUSE Linux Enterprise Desktop 15 SP3 | python-urllib3 | Not affected |
| SUSE Linux Enterprise Desktop 15 SP4 | python-urllib3 | Not affected |
| SUSE Linux Enterprise Desktop 15 SP5 | python-urllib3 | Not affected |
| SUSE Linux Enterprise Desktop 15 SP6 | python-urllib3 | Not affected |
| SUSE Linux Enterprise Desktop 15 SP6 | python-urllib3_1 | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP1 | python-urllib3 | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP1-ESPOS | python-urllib3 | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP1-LTSS | python-urllib3 | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP2 | python-urllib3 | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP2-ESPOS | python-urllib3 | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP2-LTSS | python-urllib3 | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP3 | python-urllib3 | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP3-ESPOS | python-urllib3 | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP3-LTSS | python-urllib3 | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS | python-urllib3 | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS | python-urllib3 | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP6 | python-urllib3 | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP6 | python-urllib3_1 | Not affected |
| SUSE Linux Enterprise Micro 5.0 | python-urllib3 | Not affected |
| SUSE Linux Enterprise Micro 5.1 | python-urllib3 | Not affected |
| SUSE Linux Enterprise Micro 5.2 | python-urllib3 | Not affected |
| SUSE Linux Enterprise Module for Basesystem 15 SP1 | python-urllib3 | Not affected |
| SUSE Linux Enterprise Module for Basesystem 15 SP2 | python-urllib3 | Not affected |
| SUSE Linux Enterprise Module for Basesystem 15 SP3 | python-urllib3 | Not affected |
| SUSE Linux Enterprise Module for Python 2 15 SP1 | python-urllib3 | Not affected |
| SUSE Linux Enterprise Module for Python 2 15 SP2 | python-urllib3 | Not affected |
| SUSE Linux Enterprise Module for Python 2 15 SP3 | python-urllib3 | Not affected |
| SUSE Linux Enterprise Point of Sale 12 SP2-CLIENT | python-urllib3 | Not affected |
| SUSE Linux Enterprise Real Time 15 SP2 | python-urllib3 | Not affected |
| SUSE Linux Enterprise Real Time 15 SP3 | python-urllib3 | Not affected |
| SUSE Linux Enterprise Real Time 15 SP4 | python-urllib3 | Not affected |
| SUSE Linux Enterprise Server 12 | python-urllib3 | Not affected |
| SUSE Linux Enterprise Server 12 SP2-BCL | python-urllib3 | Not affected |
| SUSE Linux Enterprise Server 12 SP2-ESPOS | python-urllib3 | Not affected |
| SUSE Linux Enterprise Server 12 SP2-LTSS | python-urllib3 | Not affected |
| SUSE Linux Enterprise Server 12 SP3 | python-urllib3 | Not affected |
| SUSE Linux Enterprise Server 12 SP3-BCL | python-urllib3 | Not affected |
| SUSE Linux Enterprise Server 12 SP3-ESPOS | python-urllib3 | Not affected |
| SUSE Linux Enterprise Server 12 SP3-LTSS | python-urllib3 | Not affected |
| SUSE Linux Enterprise Server 12 SP4 | python-urllib3 | Not affected |
| SUSE Linux Enterprise Server 12 SP4-ESPOS | python-urllib3 | Not affected |
| SUSE Linux Enterprise Server 12 SP4-LTSS | python-urllib3 | Not affected |
| SUSE Linux Enterprise Server 15 SP1 | python-urllib3 | Not affected |
| SUSE Linux Enterprise Server 15 SP1-BCL | python-urllib3 | Not affected |
| SUSE Linux Enterprise Server 15 SP1-LTSS | python-urllib3 | Not affected |
| SUSE Linux Enterprise Server 15 SP2 | python-urllib3 | Not affected |
| SUSE Linux Enterprise Server 15 SP2-BCL | python-urllib3 | Not affected |
| SUSE Linux Enterprise Server 15 SP2-LTSS | python-urllib3 | Not affected |
| SUSE Linux Enterprise Server 15 SP3 | python-urllib3 | Not affected |
| SUSE Linux Enterprise Server 15 SP3-BCL | python-urllib3 | Not affected |
| SUSE Linux Enterprise Server 15 SP3-LTSS | python-urllib3 | Not affected |
| SUSE Linux Enterprise Server for SAP Applications 12 | python-urllib3 | Not affected |
| SUSE Linux Enterprise Server for SAP Applications 12 SP2 | python-urllib3 | Not affected |
| SUSE Linux Enterprise Server for SAP Applications 12 SP3 | python-urllib3 | Not affected |
| SUSE Linux Enterprise Server for SAP Applications 12 SP4 | python-urllib3 | Not affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP1 | python-urllib3 | Not affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP2 | python-urllib3 | Not affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP3 | python-urllib3 | Not affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP4 | python-urllib3 | Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP5 | python-urllib3 | Not affected |
| SUSE Linux Enterprise Software Development Kit 12 SP5 | python-urllib3 | Not affected |
| SUSE Linux Enterprise Workstation Extension 12 SP5 | python-urllib3 | Not affected |
| SUSE Manager Proxy 3.2 | python-urllib3 | Not affected |
| SUSE Manager Proxy 4.0 | python-urllib3 | Not affected |
| SUSE Manager Proxy 4.1 | python-urllib3 | Not affected |
| SUSE Manager Proxy 4.2 | python-urllib3 | Not affected |
| SUSE Manager Retail Branch Server 4.0 | python-urllib3 | Not affected |
| SUSE Manager Retail Branch Server 4.1 | python-urllib3 | Not affected |
| SUSE Manager Retail Branch Server 4.2 | python-urllib3 | Not affected |
| SUSE Manager Server 3.1 | python-urllib3 | Not affected |
| SUSE Manager Server 3.2 | python-urllib3 | Not affected |
| SUSE Manager Server 4.0 | python-urllib3 | Not affected |
| SUSE Manager Server 4.1 | python-urllib3 | Not affected |
| SUSE Manager Server 4.2 | python-urllib3 | Not affected |
| SUSE OpenStack Cloud 7 | python-urllib3 | Not affected |
| SUSE OpenStack Cloud 8 | python-urllib3 | Not affected |
| SUSE OpenStack Cloud 9 | python-urllib3 | Not affected |
| SUSE OpenStack Cloud Crowbar 8 | python-urllib3 | Not affected |
| SUSE OpenStack Cloud Crowbar 9 | python-urllib3 | Not affected |
| openSUSE Leap 15.3 | python-urllib3 | Not affected |
| openSUSE Leap 15.4 | python-urllib3 | Not affected |
| openSUSE Leap 15.5 | python-urllib3 | Not affected |
| openSUSE Leap 15.6 | python-urllib3 | Affected |
| openSUSE Leap 15.6 | python-urllib3_1 | Not affected |
| openSUSE Leap Micro 5.2 | python-urllib3 | Not affected |
| openSUSE Leap Micro 5.3 | python-urllib3 | Not affected |
| openSUSE Leap Micro 5.4 | python-urllib3 | Not affected |
| openSUSE Leap Micro 5.5 | python-urllib3 | Not affected |
SUSE Timeline for this CVE
CVE page created: Fri Jun 19 22:04:15 2026CVE page last modified: Mon Jun 22 15:24:04 2026