CVE-2026-33557
CVE-2026-33557 · Apache Kafka: Missing JWT token validation in OAUTHBEARER authentication
Cette page présente des faits issus de sources publiques. Consultez l’avis original avant toute mise à jour.
A possible security vulnerability has been identified in Apache Kafka. By default, the broker property `sasl.oauthbearer.jwt.validator.class` is set to `org.apache.kafka.common.security.oauthbearer.DefaultJwtValidator`. It accepts any JWT token without validating its signature, issuer, or audience. An attacker can generate a JWT token from any issuer with the `preferred_username` set to any user, and the broker will accept it. We advise the Kafka users using kafka v4.1.0 or v4.1.1 to set the config `sasl.oauthbearer.jwt.validator.class` to `org.apache.kafka.common.security.oauthbearer.BrokerJwtValidator` explicitly to avoid this vulnerability. Since Kafka v4.1.2 and v4.2.0 and later, the issue is fixed and will correctly validate the JWT token.
CVSS 9.1 · Critique · EPSS 0,9%
- Publication
- Mise à jour
Pile logicielle: system
Produits et versions concernés
apache kafka
- Versions du logiciel
- ≥ 4.1.0, ≤ 4.1.1: Concernée (semver)
Aucun correctif publié
kafka Ubuntu:Pro:18.04:LTS
- Versions du logiciel
- 2.2.0u2-0ubuntu3.1
- 2.2.0u2-0ubuntu3.2
- 2.2.2u1-0ubuntu1+esm2
- Plages de versions concernées
- ECOSYSTEM: (−∞, +∞)
Aucun correctif publié
Sources originales
- https://kafka.apache.org/cve-list
- https://lists.apache.org/thread/v57o00hm6yszdpdnvqx2ss4561yh953h
- http://www.openwall.com/lists/oss-security/2026/04/17/2
- https://access.redhat.com/security/cve/CVE-2026-33557
- https://bugzilla.redhat.com/show_bug.cgi?id=2459739
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33557.json
- https://nvd.nist.gov/vuln/detail/CVE-2026-33557