CVE-2026-28802 | THREATINT

Description

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.

PUBLISHED Reserved 2026-03-03 | Published 2026-03-06 | Updated 2026-03-06 | Assigner GitHub_M

HIGH: 7.7CVSS: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

Problem types

CWE-347: Improper Verification of Cryptographic Signature

Product status

>= 1.6.5, < 1.6.7

affected

References

github.com/...uthlib/security/advisories/GHSA-7wc2-qxgw-g8gg

github.com/...ommit/a61c2acb807496e67f32051b5f1b1d5ccf8f0a75

github.com/...ommit/b87c32ed07b8ae7f805873e1c9cafd1016761df7

cve.org (CVE-2026-28802)

nvd.nist.gov (CVE-2026-28802)

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