CVE-2026-79993: Apache ZooKeeper: Missing ACL check on deleteContainer opcode allows unauthorized deletion of any empty persistent/container znode
Critical ZooKeeper flaw lets any authenticated client delete arbitrary empty persistent or container znodes by bypassing ACL checks.
CVE-2026-79993 (critical severity) affects Apache ZooKeeper 3.9.0-3.9.5 and 3.8.0-3.8.6. The deleteContainer opcode (0x14/20) is processed without verifying the caller's ACL permissions, allowing any authenticated client to delete specific empty znodes in the data tree regardless of ACL restrictions on the znode or its parent. This can corrupt coordination state for dependent distributed systems like Kafka, HBase, or Solr clusters relying on ZooKeeper.
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