CVE-2026-28802 — Vulnerability in authlib — CVE Details
CRITICAL
Published March 6, 2026Updated July 13, 2026Source: osv
Summary
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.
Advisory Timeline
- First published March 6, 2026 (220 days ago).
- Last revised July 13, 2026 — 129 days after initial publication.
Remediation
Upgrade to the fixed version using your package manager.
pip
Update authlib to 1.6.7 or laterpip install "authlib>=1.6.7"
After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.
Affected Packages (1)
Affects 1 ecosystem: pypi (1).
| Package | Ecosystem | Affected | Fixed In |
|---|---|---|---|
| authlib | pypi | 1.6.5, 1.6.6 | 1.6.7 |
CVSS Score Breakdown
What the CVSS (Common Vulnerability Scoring System) 9.8 score means for each attack dimension.
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
References
- https://access.redhat.com/security/cve/CVE-2026-28802WEB
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-28802.jsonWEB
- https://access.redhat.com/errata/RHSA-2026:19375ADVISORY
- https://access.redhat.com/errata/RHSA-2026:4942ADVISORY
- https://access.redhat.com/errata/RHSA-2026:5168ADVISORY
- https://access.redhat.com/errata/RHSA-2026:5665ADVISORY
- https://access.redhat.com/errata/RHSA-2026:6309ADVISORY
- https://access.redhat.com/errata/RHSA-2026:6568ADVISORY
- https://bugzilla.redhat.com/show_bug.cgi?id=2445120REPORT
- https://github.com/authlib/authlib/commit/a61c2acb807496e67f32051b5f1b1d5ccf8f0a75FIX
- https://github.com/authlib/authlib/commit/b87c32ed07b8ae7f805873e1c9cafd1016761df7FIX
- https://github.com/authlib/authlib/security/advisories/GHSA-7wc2-qxgw-g8ggEVIDENCE
Frequently Asked Questions
- What is CVE-2026-28802?
- This vulnerability has been assigned a severity rating of CRITICAL (CVSS score: 9.8/10).
- How do I check if my project is affected by CVE-2026-28802?
- CVE-2026-28802 affects authlib. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2026-28802 and 200,000+ other known vulnerabilities.
Severity & Exploitability
CVSS Score
9.8
Exploitation is straightforward and causes maximum impact. Patch immediately.
Also Known As
PYSEC-2026-2118
GHSA-7wc2-qxgw-g8gg
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