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CVE

CVE-2026-28802

Authlib is a Python library which builds OAuth and OpenID Connect servers.
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CVE

CVE-2026-28802

Authlib is a Python library which builds OAuth and OpenID Connect servers.

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.

Package Versions Affected

Package Version
patch Availability
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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
7.7
-
4.0
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
C
H
U
0
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
C
H
U
9.8
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Related Resources

No items found.

References

https://access.redhat.com/security/cve/CVE-2026-28802, https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-28802.json, https://access.redhat.com/errata/RHSA-2026:19375, https://access.redhat.com/errata/RHSA-2026:4942, https://access.redhat.com/errata/RHSA-2026:5168, https://access.redhat.com/errata/RHSA-2026:5665, https://access.redhat.com/errata/RHSA-2026:6309, https://access.redhat.com/errata/RHSA-2026:6568, https://bugzilla.redhat.com/show_bug.cgi?id=2445120, https://github.com/authlib/authlib/commit/a61c2acb807496e67f32051b5f1b1d5ccf8f0a75, https://github.com/authlib/authlib/commit/b87c32ed07b8ae7f805873e1c9cafd1016761df7, https://github.com/authlib/authlib/security/advisories/GHSA-7wc2-qxgw-g8gg

Severity

9.8

CVSS Score
0
10

Basic Information

Base CVSS
9.8
EPSS Probability
0.00425%
EPSS Percentile
0.34574%
Introduced Version
1.6.5,1.6.0
Fix Available
1.6.7

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