Incomplete List of Disallowed Inputs Affecting authlib package, versions [1.3.1,1.9.0)
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
Do your applications use this vulnerable package?
In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.
Test your applications- Snyk IDSNYK-PYTHON-AUTHLIB-21460693
- published23 Oct 2026
- disclosed22 Oct 2026
- creditElias Hasas
Introduced: 22 Oct 2026
NewCVE-2026-114615 (opens in a new tab)How to fix?
Upgrade authlib to version 1.9.0 or higher.
Overview
authlib is a library in building OAuth and OpenID Connect servers.
Affected versions of this package are vulnerable to Incomplete List of Disallowed Inputs via JWTBearerGrant.verify_claims() in authlib/oauth2/rfc7523/jwt_bearer.py, where audience validation is skipped when get_audiences() returns an empty list. An attacker can present a JWT assertion with an arbitrary or missing aud claim and have it accepted by the authorization server, bypassing the audience binding required by RFC 7523. This allows an attacker to replay tokens issued for a different audience against the vulnerable server, achieving unauthorized access or privilege escalation.