Incorrect Authorization Affecting authlib package, versions [,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.
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Start learning- Snyk IDSNYK-PYTHON-AUTHLIB-21460691
- published23 Oct 2026
- disclosed22 Oct 2026
- creditUnknown
Introduced: 22 Oct 2026
NewCVE-2026-114619 (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 Incorrect Authorization via multiple validation gaps across JWT Bearer grant handling and OIDC grants. In JWTBearerGrant.verify_claims, when get_audiences() returns an empty list, audience validation is skipped entirely rather than rejected, allowing an attacker to present a JWT assertion with any or no audience claim and have it accepted as valid. Separately, OIDHybridGrant and OpenIDImplicitGrant read scope from request.payload.scope instead of the resolved request.scope, meaning scope validation and token generation use an unresolved value that can diverge from the authorized scope. Additionally, OctetSequenceKey.get_op_key does not apply the unsafe-key marker check at retrieval time, only at import time, allowing a key containing unsafe PEM markers to be used after bypassing the import-time guard.