CVE-2026-28802
Critical · 9.8CVSS
9.8
EPSS
0.6%
Published
Mar 6, 2026
CISA due date
—
The record
Authlib is a Python library which builds OAuth and OpenID Connect servers. From version 1.6.5 to before version 1.6.7, previous tests involving passing a malicious JWT containing alg: none and an empty signature was passing the signature verification step without any changes to the application code when a failure was expected.. This issue has been patched in version 1.6.7.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
|---|---|---|---|
| PyPI | authlib | 1.6.5 | 1.6.7 |
| Chainguard | airflow-3 | 0 | 3.1.8-r0 |
| Wolfi | airflow-3 | 0 | 3.1.8-r0 |
Related vulnerabilities
- GHSA-fg6f-75jq-6523 Authlib has 1-click Account Takeover vulnerability Also affects authlib
- CVE-2025-68158 Authlib is a Python library which builds OAuth and OpenID Connect servers. Also affects authlib
- CVE-2025-62706 Authlib : JWE zip=DEF decompression bomb enables DoS Also affects authlib
- CVE-2025-61920 Authlib is vulnerable to Denial of Service via Oversized JOSE Segments Also affects authlib
- CVE-2025-59420 Authlib is a Python library which builds OAuth and OpenID Connect servers. Also affects authlib
- CVE-2026-34073 cryptography is a package designed to expose cryptographic primitives and recipes to… Also affects airflow-3
- CVE-2026-25645 Requests is a HTTP library. Also affects airflow-3
- CVE-2026-4539 A security flaw has been discovered in pygments up to 2.19.2. Also affects airflow-3