Improper Verification of Cryptographic Signature Affecting authlib package, versions [0,]
Threat Intelligence
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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Test your applications- Snyk IDSNYK-PYTHON-AUTHLIB-20257410
- published29 Sept 2026
- disclosed28 Sept 2026
- creditTong Hoang Gia (uziii2208), Nguyen Minh Tuan (nguyenminhtuan28)
Introduced: 28 Sep 2026
NewCVE-2026-96760 (opens in a new tab)How to fix?
There is no fixed version for authlib.
Overview
authlib is a library in building OAuth and OpenID Connect servers.
Affected versions of this package are vulnerable to Improper Verification of Cryptographic Signature via the JsonWebSignature.deserialize_json() method in the JWS JSON serialization handling. An attacker can have unsigned or otherwise unverified JWS payloads accepted as successfully verified by supplying a JSON Serialization JWS object to this method. This lets an attacker bypass signature checks and make forged token contents or messages appear trusted to the application. Affected deployments that rely on deserialize_json() for JWS verification can accept attacker-controlled data as valid, leading to unauthorized access decisions or other application logic being driven by untrusted payloads.