PT-2026-33644 · Apache · Apache Kafka

Published 2026-04-19 · Updated 2026-04-22 · CVE-2026-33558

Positive Technologies (AI Summary)

CVSS v3.1

5.3

Medium

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Name of the Vulnerable Software and Affected Versions Apache Kafka versions prior to 3.9.2 Apache Kafka versions prior to 4.0.1

Description The NetworkClient component outputs complete request and response information when the log level is set to DEBUG. While the default log level is INFO, enabling DEBUG exposes sensitive data through the logs. Impacted requests and responses include 'AlterConfigsRequest', 'AlterUserScramCredentialsRequest', 'ExpireDelegationTokenRequest', 'IncrementalAlterConfigsRequest', 'RenewDelegationTokenRequest', 'SaslAuthenticateRequest', 'createDelegationTokenResponse', 'describeDelegationTokenResponse', and 'SaslAuthenticateResponse'.

Recommendations Upgrade to version 3.9.2 or later. Upgrade to version 4.0.1 or later. As a temporary workaround, ensure the log level for the NetworkClient component is not set to DEBUG.

Fix

Insertion into Log File

Weakness Enumeration

CWE-533

CWE-532

Related Identifiers

BIT-KAFKA-2026-33558

CVE-2026-33558

GHSA-WF66-MPHR-4C4R

Affected Products

Apache Kafka

References · 12

• https://osv.dev/vulnerability/GHSA-wf66-mphr-4c4r · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-33558 · Security Note
• https://lists.apache.org/thread/pz5g4ky3h0k91tfd14p0dzqjp80960kl · Vendor Advisory
• https://kafka.apache.org/cve-list · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-33558 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-33558 · Security Note
• https://osv.dev/vulnerability/BIT-kafka-2026-33558 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-33558 · Vendor Advisory
• https://github.com/apache/kafka · Note
• https://twitter.com/Netlas_io/status/2046618609246482627 · Twitter Post
• https://twitter.com/oss_security/status/2045901549587575262 · Twitter Post
• http://openwall.com/lists/oss-security/2026/04/17/3 · Note