PT-2026-33644 · Apache · Apache Kafka

CVE-2026-33558 · Published 2026-04-17 · Updated 2026-07-21

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.

Exploit

Fix

Insertion into Log File

Weakness Enumeration

CWE-532

CWE-533

Related Identifiers

BDU:2026-10857

BIT-KAFKA-2026-33558

CLEANSTART-2026-FX60287

CLEANSTART-2026-FZ22182

CLEANSTART-2026-MT41286

CLEANSTART-2026-RU36468

CVE-2026-33558

GHSA-WF66-MPHR-4C4R

Affected Products

Apache Kafka

References · 88

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33558.json · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2026-35554 · Security Note
• https://ubuntu.com/security/CVE-2026-33558 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-33870 · Security Note
• https://osv.dev/vulnerability/CLEANSTART-2026-FZ22182 · Vendor Advisory
• https://kafka.apache.org/cve-list · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-42402 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-41417 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-3505 · Security Note
• https://osv.dev/vulnerability/CLEANSTART-2026-MT41286 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-42580 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-3260 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-42578 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-33871 · Security Note
• https://osv.dev/vulnerability/GHSA-wf66-mphr-4c4r · Vendor Advisory