CVE-2026-33558

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Source
https://cve.org/CVERecord?id=CVE-2026-33558
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-33558.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2026-33558
Aliases
Downstream
Related
Published
2026-04-20T13:20:38.059Z
Modified
2026-07-01T11:53:53.731949624Z
Severity
  • 5.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N CVSS Calculator
Summary
Apache Kafka, Apache Kafka Clients: Information Exposure Through Network Client Log Output
Details

Information exposure vulnerability has been identified in Apache Kafka.

The NetworkClient component will output entire requests and responses information in the DEBUG log level in the logs. By default, the log level is set to INFO level. If the DEBUG level is enabled, the sensitive information will be exposed via the requests and responses output log. The entire lists of impacted requests and responses are:

  • AlterConfigsRequest

  • AlterUserScramCredentialsRequest

  • ExpireDelegationTokenRequest

  • IncrementalAlterConfigsRequest

  • RenewDelegationTokenRequest

  • SaslAuthenticateRequest

  • createDelegationTokenResponse

  • describeDelegationTokenResponse

  • SaslAuthenticateResponse

This issue affects Apache Kafka: from any version supported the listed API above through v3.9.1, v4.0.0. We advise the Kafka users to upgrade to v3.9.2, v4.0.1, or later to avoid this vulnerability.

Database specific 
{
    "cwe_ids": [
        "CWE-533"
    ],
    "cna_assigner": "apache",
    "unresolved_ranges": [
        {
            "extracted_events": [
                {
                    "introduced": "0.11.0"
                },
                {
                    "last_affected": "3.9.1"
                },
                {
                    "last_affected": "4.0.0"
                },
                {
                    "introduced": "0.11.0"
                },
                {
                    "last_affected": "3.9.1"
                },
                {
                    "last_affected": "4.0.0"
                }
            ],
            "source": "AFFECTED_FIELD"
        },
        {
            "extracted_events": [
                {
                    "fixed": "v3.9.1"
                }
            ],
            "source": "DESCRIPTION"
        }
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33558.json"
}
References

Affected packages

Git / github.com/apache/kafka

Affected ranges

Type
GIT
Repo
https://github.com/apache/kafka
Events
Introduced
e18335dd953107a61d89451932de33d33c0fd207
Fixed
5e9866f43ab8e7e41ef39e5584ac50019381328d
Introduced
0 Unknown introduced commit / All previous commits are affected
Database specific 
{
    "extracted_events": [
        {
            "introduced": "0.11.0.0"
        },
        {
            "fixed": "3.9.2"
        },
        {
            "introduced": "0"
        },
        {
            "last_affected": "4.0.0-NA"
        },
        {
            "last_affected": "4.0.0-rc0"
        },
        {
            "last_affected": "4.0.0-rc1"
        },
        {
            "last_affected": "4.0.0-rc3"
        }
    ],
    "cpe": [
        "cpe:2.3:a:apache:kafka:*:*:*:*:*:*:*:*",
        "cpe:2.3:a:apache:kafka:4.0.0:-:*:*:*:*:*:*",
        "cpe:2.3:a:apache:kafka:4.0.0:rc0:*:*:*:*:*:*",
        "cpe:2.3:a:apache:kafka:4.0.0:rc1:*:*:*:*:*:*",
        "cpe:2.3:a:apache:kafka:4.0.0:rc3:*:*:*:*:*:*"
    ],
    "source": [
        "CPE_RANGE",
        "CPE_STRING"
    ]
}

Affected versions

3.*
3.9.1
3.9.1-rc1
3.9.1-rc2

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-33558.json"