Upstream information
Description
OAuthLib is an implementation of the OAuth request-signing logic for Python 3.6+. From 3.0.0 until 4.0.0, OAuthLib's PKCE checks in oauthlib/oauth2/rfc6749/grant_types/authorization_code.py compare attacker-supplied code_verifier values with stored challenges using ordinary string equality in code_challenge_method_plain and code_challenge_method_s256. Because the comparison can return after a length difference or the first mismatching character, repeated token endpoint measurements can reveal common-prefix timing information that could potentially allow recovery of the code_verifier, unauthorized access-token acquisition, and account takeover. Practical exploitation requires an intercepted, single-use authorization code and enough measurements to overcome real-world network noise; the local timing benchmark does not establish practical remote account takeover, so the weakness remains a defense-in-depth concern. This issue is fixed in version 4.0.0.SUSE information
Overall state of this security issue: Pending
This issue is currently rated as having moderate severity.
| CVSS detail | CNA (GitHub) | SUSE |
|---|---|---|
| Base Score | 6.8 | 6.8 |
| Vector | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N |
| Attack Vector | Network | Network |
| Attack Complexity | High | High |
| Privileges Required | None | None |
| User Interaction | Required | Required |
| Scope | Unchanged | Unchanged |
| Confidentiality Impact | High | High |
| Integrity Impact | High | High |
| Availability Impact | None | None |
| CVSSv3 Version | 3.1 | 3.1 |
| CVSS detail | SUSE |
|---|---|
| Base Score | 7.6 |
| Vector | CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N |
| Attack Vector | Network |
| Attack Complexity | High |
| Attack Requirements | Present |
| Privileges Required | None |
| User Interaction | Passive |
| 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 Security Advisories:
- SUSE-SU-2026:24139-1, published Wed Oct 14 17:07:59 CEST 2026
- SUSE-SU-2026:24189-1, published Tue Oct 20 01:02:49 CEST 2026
- SUSE-SU-2026:24246-1, published Wed Oct 21 01:02:59 CEST 2026
- SUSE-SU-2026:4810-1, published Wed Oct 21 15:05:01 CEST 2026
List of released packages
| Product(s) | Fixed package version(s) | References |
|---|---|---|
| SUSE Linux Enterprise Desktop 15 SP7 SUSE Linux Enterprise Module for Python 3 15 SP7 SUSE Linux Enterprise Server 15 SP7 SUSE Linux Enterprise Server for SAP Applications 15 SP7 |
| Patchnames: SUSE-SLE-Module-Python3-15-SP7-2026-4810 |
| SUSE Linux Enterprise High Performance Computing 15 SP4 SUSE Linux Enterprise Module for Public Cloud 15 SP4 SUSE Linux Enterprise Server 15 SP4 SUSE Linux Enterprise Server for SAP Applications 15 SP4 SUSE Manager Proxy 4.3 SUSE Manager Retail Branch Server 4.3 SUSE Manager Server 4.3 |
| Patchnames: SUSE-SLE-Module-Public-Cloud-15-SP4-2026-4810 |
| SUSE Linux Enterprise Server 16.0 SUSE Linux Enterprise Server for SAP applications 16.0 |
| Patchnames: SUSE-SLES-16.0-1917 |
| SUSE Linux Micro 6.0 |
| Patchnames: SUSE-SLE-Micro-6.0-928 |
| SUSE Linux Micro 6.2 |
| Patchnames: SUSE-SL-Micro-6.2-1917 |
| openSUSE Leap 16.0 |
| Patchnames: openSUSE-Leap-16.0-1917 |
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-oauthlib | Released |
| SUSE Linux Enterprise High Performance Computing 12 | python-oauthlib | Affected |
| SUSE Linux Enterprise Micro 5.5 | python-oauthlib | Affected |
| SUSE Linux Enterprise Module for Basesystem 15 SP7 | python-oauthlib | Affected |
| SUSE Linux Enterprise Module for Python 3 15 SP7 | python-oauthlib | Released |
| SUSE Linux Enterprise Server 15 SP7 | python-oauthlib | Released |
| SUSE Linux Enterprise Server 16.0 | python-oauthlib | Released |
| SUSE Linux Enterprise Server 16.1 | python-oauthlib | In progress |
| SUSE Linux Enterprise Server 16.2 | python-oauthlib | Affected |
| SUSE Linux Enterprise Server for NVIDIA 16.1 | python-oauthlib | In progress |
| SUSE Linux Enterprise Server for SAP Applications 15 SP7 | python-oauthlib | Released |
| SUSE Linux Enterprise Server for SAP applications 16.0 | python-oauthlib | Released |
| SUSE Linux Enterprise Server for SAP applications 16.1 | python-oauthlib | In progress |
| SUSE Linux Enterprise Server for SAP applications 16.2 | python-oauthlib | Affected |
| SUSE Linux Micro 6.0 | python-oauthlib | Released |
| SUSE Linux Micro 6.1 | python-oauthlib | In progress |
| SUSE Linux Micro 6.2 | python-oauthlib | Released |
| openSUSE Leap 16.0 | python-oauthlib | Affected |
| openSUSE Leap 16.1 | python-oauthlib | Affected |
| Products under Long Term Service Pack support and receiving important and critical security fixes. | ||
| SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS | python-oauthlib | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP5 | python-oauthlib | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS | python-oauthlib | Affected |
| SUSE Linux Enterprise Module for Basesystem 15 SP4 | python-oauthlib | Affected |
| SUSE Linux Enterprise Module for Basesystem 15 SP5 | python-oauthlib | Affected |
| SUSE Linux Enterprise Module for Basesystem 15 SP6 | python-oauthlib | Affected |
| SUSE Linux Enterprise Module for Public Cloud 12 | python-oauthlib | Affected |
| SUSE Linux Enterprise Module for Public Cloud 15 SP4 | python-oauthlib | Released |
| SUSE Linux Enterprise Module for Python 3 15 SP4 | python-oauthlib | Affected |
| SUSE Linux Enterprise Module for Python 3 15 SP5 | python-oauthlib | Affected |
| SUSE Linux Enterprise Module for Python 3 15 SP6 | python-oauthlib | Affected |
| SUSE Linux Enterprise Server 12 SP5 | python-oauthlib | Affected |
| SUSE Linux Enterprise Server 12 SP5-LTSS | python-oauthlib | Affected |
| SUSE Linux Enterprise Server 15 SP4 | python-oauthlib | Released |
| SUSE Linux Enterprise Server 15 SP4-LTSS | python-oauthlib | Affected |
| SUSE Linux Enterprise Server 15 SP5 | python-oauthlib | Affected |
| SUSE Linux Enterprise Server 15 SP5-LTSS | python-oauthlib | Affected |
| SUSE Linux Enterprise Server 15 SP6 | python-oauthlib | Affected |
| SUSE Linux Enterprise Server 15 SP6-LTSS | python-oauthlib | Affected |
| SUSE Linux Enterprise Server LTSS Extended Security 12 SP5 | python-oauthlib | Affected |
| SUSE Linux Enterprise Server for SAP Applications 12 SP5 | python-oauthlib | Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP4 | python-oauthlib | Released |
| SUSE Linux Enterprise Server for SAP Applications 15 SP5 | python-oauthlib | Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP6 | python-oauthlib | Affected |
| Products past their end of life and not receiving proactive updates anymore. | ||
| HPE Helion OpenStack 8 | python-oauthlib | Affected |
| SUSE CaaS Platform 3.0 | python-oauthlib | Affected |
| SUSE CaaS Platform 4.0 | python-oauthlib | Affected |
| SUSE Enterprise Storage 6 | python-oauthlib | Affected |
| SUSE Enterprise Storage 7 | python-oauthlib | Affected |
| SUSE Enterprise Storage 7.1 | python-oauthlib | Affected |
| SUSE Linux Enterprise Desktop 15 SP1 | python-oauthlib | Affected |
| SUSE Linux Enterprise Desktop 15 SP2 | python-oauthlib | Affected |
| SUSE Linux Enterprise Desktop 15 SP3 | python-oauthlib | Affected |
| SUSE Linux Enterprise Desktop 15 SP4 | python-oauthlib | Affected |
| SUSE Linux Enterprise Desktop 15 SP5 | python-oauthlib | Affected |
| SUSE Linux Enterprise Desktop 15 SP6 | python-oauthlib | Affected |
| SUSE Linux Enterprise High Performance Computing 15 | python-oauthlib | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP1 | python-oauthlib | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP1-ESPOS | python-oauthlib | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP1-LTSS | python-oauthlib | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP2 | python-oauthlib | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP2-ESPOS | python-oauthlib | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP2-LTSS | python-oauthlib | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP3 | python-oauthlib | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP3-ESPOS | python-oauthlib | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP3-LTSS | python-oauthlib | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP4 | python-oauthlib | Released |
| SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS | python-oauthlib | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS | python-oauthlib | Affected |
| SUSE Linux Enterprise Module for Basesystem 15 SP1 | python-oauthlib | Affected |
| SUSE Linux Enterprise Module for Basesystem 15 SP2 | python-oauthlib | Affected |
| SUSE Linux Enterprise Module for Basesystem 15 SP3 | python-oauthlib | Affected |
| SUSE Linux Enterprise Module for Package Hub 15 | python-oauthlib | Affected |
| SUSE Linux Enterprise Module for Package Hub 15 SP1 | python-oauthlib | Affected |
| SUSE Linux Enterprise Module for Package Hub 15 SP2 | python-oauthlib | Affected |
| SUSE Linux Enterprise Module for Package Hub 15 SP3 | python-oauthlib | Affected |
| SUSE Linux Enterprise Module for Package Hub 15 SP4 | python-oauthlib | Affected |
| SUSE Linux Enterprise Module for Package Hub 15 SP5 | python-oauthlib | Affected |
| SUSE Linux Enterprise Module for Public Cloud 15 | python-oauthlib | Affected |
| SUSE Linux Enterprise Module for Public Cloud 15 SP1 | python-oauthlib | Affected |
| SUSE Linux Enterprise Module for Public Cloud 15 SP2 | python-oauthlib | Affected |
| SUSE Linux Enterprise Real Time 15 SP2 | python-oauthlib | Affected |
| SUSE Linux Enterprise Real Time 15 SP3 | python-oauthlib | Affected |
| SUSE Linux Enterprise Real Time 15 SP4 | python-oauthlib | Affected |
| SUSE Linux Enterprise Server 12 | python-oauthlib | Affected |
| SUSE Linux Enterprise Server 12 SP3 | python-oauthlib | Affected |
| SUSE Linux Enterprise Server 12 SP4 | python-oauthlib | Affected |
| SUSE Linux Enterprise Server 15 | python-oauthlib | Affected |
| SUSE Linux Enterprise Server 15 SP1 | python-oauthlib | Affected |
| SUSE Linux Enterprise Server 15 SP1-BCL | python-oauthlib | Affected |
| SUSE Linux Enterprise Server 15 SP1-LTSS | python-oauthlib | Affected |
| SUSE Linux Enterprise Server 15 SP2 | python-oauthlib | Affected |
| SUSE Linux Enterprise Server 15 SP2-BCL | python-oauthlib | Affected |
| SUSE Linux Enterprise Server 15 SP2-LTSS | python-oauthlib | Affected |
| SUSE Linux Enterprise Server 15 SP3 | python-oauthlib | Affected |
| SUSE Linux Enterprise Server 15 SP3-BCL | python-oauthlib | Affected |
| SUSE Linux Enterprise Server 15 SP3-LTSS | python-oauthlib | Affected |
| SUSE Linux Enterprise Server for SAP Applications 12 | python-oauthlib | Affected |
| SUSE Linux Enterprise Server for SAP Applications 12 SP3 | python-oauthlib | Affected |
| SUSE Linux Enterprise Server for SAP Applications 12 SP4 | python-oauthlib | Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 | python-oauthlib | Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP1 | python-oauthlib | Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP2 | python-oauthlib | Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP3 | python-oauthlib | Affected |
| SUSE Manager Proxy 4.0 | python-oauthlib | Affected |
| SUSE Manager Proxy 4.1 | python-oauthlib | Affected |
| SUSE Manager Proxy 4.2 | python-oauthlib | Affected |
| SUSE Manager Proxy 4.3 | python-oauthlib | Released |
| SUSE Manager Proxy LTS 4.3 | python-oauthlib | Affected |
| SUSE Manager Retail Branch Server 4.0 | python-oauthlib | Affected |
| SUSE Manager Retail Branch Server 4.1 | python-oauthlib | Affected |
| SUSE Manager Retail Branch Server 4.2 | python-oauthlib | Affected |
| SUSE Manager Retail Branch Server 4.3 | python-oauthlib | Released |
| SUSE Manager Retail Branch Server LTS 4.3 | python-oauthlib | Affected |
| SUSE Manager Server 3.2 | python-oauthlib | Affected |
| SUSE Manager Server 4.0 | python-oauthlib | Affected |
| SUSE Manager Server 4.1 | python-oauthlib | Affected |
| SUSE Manager Server 4.2 | python-oauthlib | Affected |
| SUSE Manager Server 4.3 | python-oauthlib | Released |
| SUSE Manager Server LTS 4.3 | python-oauthlib | Affected |
| SUSE OpenStack Cloud 7 | python-oauthlib | Affected |
| SUSE OpenStack Cloud 8 | python-oauthlib | Affected |
| SUSE OpenStack Cloud Crowbar 8 | python-oauthlib | Affected |
| openSUSE Leap 15.3 | python-oauthlib | Affected |
| openSUSE Leap 15.4 | python-oauthlib | Released |
| openSUSE Leap 15.5 | python-oauthlib | Affected |
| openSUSE Leap 15.6 | python-oauthlib | Affected |
SUSE Timeline for this CVE
CVE page created: Wed Sep 30 19:45:10 2026CVE page last modified: Wed Oct 21 17:02:18 2026