Improper Validation of Specified Index, Position, or Offset in Input Affecting org.apache.kafka:kafka-clients package, versions [4.1.0,4.1.2)
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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- published24 Apr 2026
- disclosed20 Apr 2026
- creditPavel Romanov
Introduced: 20 Apr 2026
NewCVE-2026-33557 (opens in a new tab)How to fix?
Upgrade org.apache.kafka:kafka-clients to version 4.1.2 or higher.
Overview
org.apache.kafka:kafka-clients is a streaming platform that can publish and subscribe to streams of records, store streams of records in a fault-tolerant durable way, and process streams of records as they occur.
Affected versions of this package are vulnerable to Improper Validation of Specified Index, Position, or Offset in Input in the DefaultJwtValidator oauthbearer validator when sasl.enabled.mechanisms=OAUTHBEARER is configured on the server side. An attacker can gain unauthorized access by supplying a crafted JWT token with arbitrary issuer and user information.