Review reviewHigh

CVE-2026-28802

authlib authlib, Red Hat Ansible Automation Platform 2.6, Red Hat Quay 3.1

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.

CVSS: 7.7
EPSS: 0.43%
CISA KEV: Not listed
Published: 2026.03.06

PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV

Exploit probability0.43%

Technical severityCVSS 7.7

Vulnerability overview

Affected product and versions

Product: authlib authlib, Red Hat Ansible Automation Platform 2.6, Red Hat Quay 3.1
Affected versions: >= >= 1.6.5, < 1.6.7, >= 1.6.5 < 1.6.7
Fixed versions: 1.6.7

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide

1
Identify
Confirm that authlib authlib, Red Hat Ansible Automation Platform 2.6, Red Hat Quay 3.1 and an affected version are present.
2
Prioritize
Combine exploitation signals with asset exposure and business criticality.
3
Remediate
Follow the vendor advisory or supported update path and preserve rollback options.
4
Verify
Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CWE: CWE-347