Upstream information
Description
Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to version 1.6.9, a JWK Header Injection vulnerability in authlib's JWS implementation allows an unauthenticated attacker to forge arbitrary JWT tokens that pass signature verification. When key=None is passed to any JWS deserialization function, the library extracts and uses the cryptographic key embedded in the attacker-controlled JWT jwk header field. An attacker can sign a token with their own private key, embed the matching public key in the header, and have the server accept the forged token as cryptographically valid - bypassing authentication and authorization entirely. This issue has been patched in version 1.6.9.SUSE information
Overall state of this security issue: Pending
This issue is currently rated as having critical severity.
| CVSS detail | 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 detail | SUSE |
|---|---|
| Base Score | 9.1 |
| Vector | CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N |
| Attack Vector | Network |
| Attack Complexity | Low |
| Attack Requirements | Present |
| 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 |
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Please note that this evaluation state might be work in progress, incomplete or outdated.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-Authlib | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP7 | python-Authlib | Affected |
| SUSE Linux Enterprise Module for Python 3 15 SP7 | python-Authlib | Affected |
| SUSE Linux Enterprise Server 15 SP7 | python-Authlib | Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP7 | python-Authlib | Affected |
| openSUSE Leap 15.6 | python-Authlib | Affected |
| Products under Long Term Service Pack support and receiving important and critical security fixes. | ||
| SUSE Linux Enterprise Server 15 SP6-LTSS | python-Authlib | Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP6 | python-Authlib | Affected |
| Products past their end of life and not receiving proactive updates anymore. | ||
| SUSE Linux Enterprise Desktop 15 SP6 | python-Authlib | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP6 | python-Authlib | Affected |
| SUSE Linux Enterprise Module for Python 3 15 SP6 | python-Authlib | Affected |
| SUSE Linux Enterprise Server 15 SP6 | python-Authlib | Affected |
SUSE Timeline for this CVE
CVE page created: Mon Mar 16 20:00:41 2026CVE page last modified: Tue Mar 17 16:54:33 2026