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CERTFR-2026-AVI-0461
Vulnerability from certfr_avis - Published: 2026-04-20 - Updated: 2026-04-20
De multiples vulnérabilités ont été découvertes dans Apache Kafka. Elles permettent à un attaquant de provoquer une atteinte à la confidentialité des données et un contournement de la politique de sécurité.
Solutions
Se référer au bulletin de sécurité de l'éditeur pour l'obtention des correctifs (cf. section Documentation).
Impacted products
| Vendor | Product | Description | ||
|---|---|---|---|---|
| Apache | Kafka Clients | Kafka Clients versions antérieures à 3.9.2 | ||
| Apache | Kafka Clients | Kafka Clients versions 4.1.x antérieures à 4.1.2 | ||
| Apache | Kafka | Kafka versions 4.1.x antérieures à 4.1.2 | ||
| Apache | Kafka Clients | Kafka Clients versions 4.0.x antérieures à 4.0.1 |
References
| Title | Publication Time | Tags | |||
|---|---|---|---|---|---|
|
|||||
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CVE-2026-33557 (GCVE-0-2026-33557)
Vulnerability from cvelistv5 – Published: 2026-04-20 13:28 – Updated: 2026-07-15 01:06
VLAI
EPSS
VEX
Title
Apache Kafka: Missing JWT token validation in OAUTHBEARER authentication
Summary
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.
Severity
9.1 (Critical)
8.6 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
6 references
| URL | Tags |
|---|---|
| https://kafka.apache.org/cve-list | vendor-advisory |
| https://lists.apache.org/thread/v57o00hm6yszdpdnv… | mailing-list |
| http://www.openwall.com/lists/oss-security/2026/04/17/2 | |
| https://access.redhat.com/security/cve/CVE-2026-33557 | vdb-entryx_refsource_REDHAT |
| https://bugzilla.redhat.com/show_bug.cgi?id=2459739 | issue-trackingx_refsource_REDHAT |
| https://security.access.redhat.com/data/csaf/v2/v… | x_sadp-csaf-vex |
Impacted products
19 products
Credits
Павел Романов <promanov1994@gmail.com>
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CVE-2026-33558 (GCVE-0-2026-33558)
Vulnerability from cvelistv5 – Published: 2026-04-20 13:20 – Updated: 2026-04-20 14:20
VLAI
EPSS
VEX
Title
Apache Kafka, Apache Kafka Clients: Information Exposure Through Network Client Log Output
Summary
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.
Severity
5.3 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-533 - DEPRECATED: Information Exposure Through Server Log Files
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://kafka.apache.org/cve-list | vendor-advisory |
| https://lists.apache.org/thread/pz5g4ky3h0k91tfd1… | mailing-list |
| http://www.openwall.com/lists/oss-security/2026/04/17/3 |
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Apache Software Foundation | Apache Kafka |
Affected:
0.11.0 , ≤ 3.9.1
(semver)
Affected: 4.0.0 (semver) |
|
| Apache Software Foundation | Apache Kafka Clients |
Affected:
0.11.0 , ≤ 3.9.1
(semver)
Affected: 4.0.0 (semver) |
Credits
Alyssa Huang <ahuang@confluent.io>
Luke Chen <showuon@gmail.com>
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Trend slope:
-
(linear fit over daily sighting counts)
Show additional events:
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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