Unscored severity · published Oct 28, 2026
CVE-2026-83525
Apache Kafka: Incorrect boolean operator in FetchSnapshot RPC handler allows authenticated network clients to crash the KRaft controller via a malformed request.
New
–
CVSS
–
EPSS
No
On KEV
Description
Incorrect operator (CWE-480) in the FetchSnapshot RPC handler
in Apache Kafka from 2.8.0 before 4.2.2, and from 4.3.0 before 4.3.2
on all platforms allows an authenticated attacker with
CLUSTER_ACTION privilege to cause a denial of service
(controller process termination) via a crafted
FetchSnapshotRequest with an empty topics array or a topic
with no partitions.
Users are recommended to upgrade to version 4.2.2, 4.3.2, or
4.4.0, which fix this issue. Users on unsupported branches
(4.1.x and earlier) should upgrade to 4.2.2 or later.
Exploitation
Is it being used?
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AK
Apache Kafka · Apache Software Foundation
2.8.0 before 4.2.2; 4.3.0 before 4.3.2 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-83525
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-83525
patch
https://github.com/apache/kafka/pull/23185
vendor-advisory
https://kafka.apache.org/cve-list
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