> CVE-2026-33557

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PUBLISHED
2026-04-20 14:16
MODIFIED
2026-04-20 14:16
EPSS (Prob. Exploit)
0.90%
Top 40.2%
DATA SOURCES:
NVD 🔗 2026-04-20 RED HAT 🔗 2026-04-26 CWE MITRE 🔗 2026-11-01 FIRST EPSS 🔗 2026-11-08 GITHUB 🔗 2026-11-05 OSV 🔗 2026-10-25

> DESCRIPTION

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.

> AFFECTED_PRODUCTS

ℹ️ Aucun produit affecté n'a encore été publié par NVD pour cette CVE.

> WEAKNESSES

CWE-1285

> CWE DETAILED DESCRIPTIONS

CWE-1285: Improper Validation of Specified Index, Position, or Offset in Input - The product receives input that is expected to specify an index, position, or offset into an indexable resource such as a buffer or file, but it does not validate or incorrectly validates that the specified index/position/offset has the required properties.

> RED HAT SEVERITY ASSESSMENT

THREAT SEVERITY
Important

> GITHUB SECURITY ADVISORY

GHSA-28jg-cgg7-j4wc CRITICAL

Apache Kafka does not validate JWT tokens in its OAUTHBEARER authentication implementation

AFFECTED PACKAGES:
MAVEN / org.apache.kafka:kafka-clients
>= 4.1.0, < 4.1.2
Fixed in: 4.1.2

> OSV (GOOGLE OPEN SOURCE VULNERABILITIES)

Apache Kafka: Missing JWT token validation in OAUTHBEARER authentication

AFFECTED PACKAGES:
Unknown / Unknown
5 versions affected
ALIASES:
BIT-kafka-2026-33557, GHSA-28jg-cgg7-j4wc

> HISTORIQUE DES MODIFICATIONS

Première apparition
20/04/2026 14:16
Source: NVD
📊 ENRICHISSEMENT 01/05/2026 06:01
CWE
Champ modifié: Description CWE
Ancienne valeur:
N/A
Nouvelle valeur:
CWE-1285: Improper Validation of Specified Index, Position, or Offset in Input - The product receives input that is expected to specify an index, position, or offset into an indexable resource such as...
📊 ENRICHISSEMENT 26/04/2026 05:02
REDHAT
Champ modifié: Sévérité Red Hat
Ancienne valeur:
N/A
Nouvelle valeur:
{ "threat_severity": "Important", "severity_scale": null }
📊 ENRICHISSEMENT 26/04/2026 05:02
REDHAT
Champ modifié: Red Hat
Ancienne valeur:
Non
Nouvelle valeur:
Oui
Total des modifications: 3 Dernière mise à jour: 6 months ago

> REFERENCES

https://kafka.apache.org/cve-list
https://lists.apache.org/thread/v57o00hm6yszdpdnvqx2ss4561yh953h
http://www.openwall.com/lists/oss-security/2026/04/17/2
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