{"resultsPerPage":1,"startIndex":0,"totalResults":1,"format":"NVD_CVE","version":"2.0","timestamp":"2026-10-29T03:36:03.122","vulnerabilities":[{"cve":{"id":"CVE-2026-114349","sourceIdentifier":"security@apache.org","published":"2026-10-28T17:17:56.573","lastModified":"2026-10-28T20:17:19.720","vulnStatus":"Received","cveTags":[],"descriptions":[{"lang":"en","value":"When a broker decodes a compressed record batch, the per-record decoder reads a declared body size from the decompressed stream and allocates a buffer of that size before validating it against the bytes available or any configured limit. The size is attacker-controlled, and the batch CRC does not constrain it, so a small (around 90-byte), CRC-valid compressed produce request can declare a body size of up to about 2 GiB and force the broker to attempt that allocation, raising OutOfMemoryError. The record size limit (max.message.bytes), the request size limit, and client/broker quotas bound only the compressed wire size, not the declared decompressed size.\n\n\nImpact:\n\nAn authenticated principal with Write on a topic can crash broker request-handler threads (reached when a batch's codec differs from the topic's compression.type and records are re-encoded) and any consumer that fetches the record, denying service. On brokers started with -XX:+ExitOnOutOfMemoryError, a common hardening, a single crafted request terminates the broker JVM. More seriously, a crafted record  is accepted at ingest and written to disk; when the log-cleaner later reads it on a compacted topic, the OutOfMemoryError (an Error, not an Exception) terminates the cleaner thread, which is not restarted. With the default of a single cleaner thread, log compaction then stops for the entire broker, including the internal __consumer_offsets and __transaction_state topics, and the condition persists across restarts until the offending record is removed. The impact is availability only; no data is disclosed or altered.\n\n\nMitigation:\n\nUpgrade to Apache Kafka 4.2.2, 4.3.2, or 4.4.0, and set max.decompressed.message.bytes (at the broker and/or topic level) to a bounded value appropriate for your workload. Upgrading alone is not sufficient: for backward compatibility this configuration defaults to an effectively unlimited value (about 2 GiB), so a broker remains exposed until the limit is set. Choose a value at or slightly above the largest legitimate decompressed record your applications produce, and comfortably below the broker heap divided by the number of request-handler and cleaner threads. Until you can upgrade and configure the limit, restrict Write access to trusted producers; quotas and max.message.bytes do not mitigate this issue.\n\n\nResolution:\n\nFrom Apache Kafka 4.2.2, 4.3.2, and 4.4.0: the broker validates a record's declared decompressed body size against max.decompressed.message.bytes before allocating, on the produce-validation, log-compaction, and timestamp-lookup paths, and rejects oversized or negative sizes with InvalidRecordException. Operators must set this configuration to a bounded value to be protected, as its default is effectively unlimited."}],"affected":[{"source":"security@apache.org","affectedData":[{"vendor":"Apache Software Foundation","product":"Apache Kafka","defaultStatus":"unaffected","collectionURL":"https://repo.maven.apache.org/maven2","packageName":"org.apache.kafka:kafka","packageURL":"pkg:maven/org.apache.kafka/kafka","versions":[{"version":"0.11.0.0","lessThanOrEqual":"4.1.2","versionType":"semver","status":"affected"},{"version":"4.2.0","lessThanOrEqual":"4.2.1","versionType":"semver","status":"affected"},{"version":"4.3.0","lessThanOrEqual":"4.3.1","versionType":"semver","status":"affected"}]}]}],"metrics":{},"weaknesses":[{"source":"security@apache.org","type":"Secondary","description":[{"lang":"en","value":"CWE-400"},{"lang":"en","value":"CWE-789"},{"lang":"en","value":"CWE-1284"}]}],"references":[{"url":"https://kafka.apache.org/cve-list","source":"security@apache.org"},{"url":"http://www.openwall.com/lists/oss-security/2026/10/28/18","source":"af854a3a-2127-422b-91ae-364da2661108"}]}}]}