CVE-2026-114616 Authlib - Authentication Bypass

Authlib < 1.9.1 contains a broken authentication caused by acceptance of zero-length key material in OctKey.import_key() and HMAC signing, letting remote attackers forge HS256/HS384/HS512 signatures, exploit requires secret lookup returning empty key.

CVSS base score 7.4 /10
High
CISA KEV
Not listed
Public exploit
None known
View the NVD record ↗

Details

Type
Authentication Bypass
Impact
Broken Authentication
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Published
22 October 2026
Updated
23 October 2026
Weakness
CWE-287

Vendor fix

Upgrade to version 1.9.1 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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