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CVE-2026-114616

9.1, critical

authlib Improper Authentication Vulnerability

NVD (opens in a new tab) CVE.org (opens in a new tab)
CVSS
9.1, critical critical CVSS v3.1
EPSS, next 30 days
0.2% higher than 11.5% of scored CVEs
Exploitation
Exploit code published
Published
22 Oct 20268 days ago

Description

Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to 1.9.1, Authlib's OctKey.import_key() and HMAC signing and verification path accept zero-length key material. If an application's secret lookup can return an empty string or empty bytes, a remote attacker can compute the deterministic HS256, HS384, or HS512 signature for arbitrary token claims and have Authlib treat the token as authentic. This issue is fixed in version 1.9.1.

Details

Vendor
Authlib
Product
authlib
Weakness
CWE-287 (opens in a new tab)
Status
Analyzed
Updated
29 Oct 2026
Assigner
security-advisories@github.com

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

References 3

Exploit code 1

Patches and fixes 1

Other references 1

The kind is read from NVD's tags where present and from the shape of the URL otherwise, so treat it as a hint.

Other Authlib CVEs

Every Authlib CVE we hold

Same vendor in what we hold, not a known link between the flaws.

  • CVE-2026-114615 Authlib is a Python library which builds OAuth and OpenID Connect servers EPSS 0.2% 9.1, critical

Beyond this page

Is CVE-2026-114616 in your network?

This page tells you how dangerous CVE-2026-114616 is out there. Whether it sits on one of your devices, only a scan of your own network can tell. That is what our systems do, every day, for the companies we protect.

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Check your exposure

Assembled from the NVD 2.0 API, the CISA Known Exploited Vulnerabilities Catalog and FIRST EPSS. Scores are as of our last collection on 30 Oct 2026, not the live upstream state.