CVE-2026-28802

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.

Database specific

{
    "cna_assigner":  "GitHub_M",
    "cwe_ids":  [
        "CWE-347"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/28xxx/CVE-2026-28802.json"
}

References

Affected packages

Git / github.com/authlib/authlib

Affected ranges

Type

GIT

Repo

https://github.com/authlib/authlib

Events

Introduced

9ec42561cd1a81b518598d252f8adbcf446f7419

Fixed

38e872a3f5b97d2658507acc8762a4e18adaa50e

Fixed

a61c2acb807496e67f32051b5f1b1d5ccf8f0a75

Fixed

b87c32ed07b8ae7f805873e1c9cafd1016761df7

Database specific

Show details

{
    "extracted_events":  [
        {
            "cpe":  "cpe:2.3:a:authlib:authlib:*:*:*:*:*:*:*:*",
            "range":  [
                {
                    "introduced":  "1.6.5"
                },
                {
                    "fixed":  "1.6.7"
                }
            ],
            "source":  "CPE_RANGE"
        },
        {
            "range":  [
                {
                    "fixed":  "a61c2acb807496e67f32051b5f1b1d5ccf8f0a75"
                }
            ],
            "source":  "REFERENCES_COMMIT"
        },
        {
            "range":  [
                {
                    "fixed":  "b87c32ed07b8ae7f805873e1c9cafd1016761df7"
                }
            ],
            "source":  "REFERENCES_COMMIT"
        }
    ]
}

Affected versions

v1.*

v1.6.5

v1.6.6

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-28802.json"