---
title: "CVE-2026-114616: Authlib - Authentication Bypass"
description: "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."
url: https://panop.io/threat-heartbeat/CVE-2026-114616/
---

# 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 ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-114616)

## 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](https://cwe.mitre.org/data/definitions/287.html)

## 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

- [https://nvd.nist.gov/vuln/detail/CVE-2026-114616](https://nvd.nist.gov/vuln/detail/CVE-2026-114616)
- [https://github.com/authlib/authlib/commit/4ff30db442c70e29486e1982cb0ad37c037f5f4b](https://github.com/authlib/authlib/commit/4ff30db442c70e29486e1982cb0ad37c037f5f4b)
- [https://github.com/authlib/authlib/releases/tag/v1.9.1](https://github.com/authlib/authlib/releases/tag/v1.9.1)
- [https://github.com/authlib/authlib/security/advisories/GHSA-8m4g-j4wp-wgcg](https://github.com/authlib/authlib/security/advisories/GHSA-8m4g-j4wp-wgcg)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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