CVE-2026-79993
`deleteContainer` opcode (0x14/20) is processed without verifying the caller's ACL permissions,…
Technology
Apache ZooKeeper
CVSS Score
7.5 / 10.0
Affected Versions
>=3.8.0 <3.8.7; >=3.9.0 <3.9.6
Upstream Fix
See upstream advisory
Published
September 16, 2026
OSSeva Coverage
Fixed upstream
Description
The `deleteContainer` opcode (0x14/20) is processed without verifying the caller's ACL permissions, allowing any authenticated client to delete specific znodes in the data tree regardless of the ACL restrictions on the znode or its parent. This opcode is considered internal-only and the official client doesn't have API for it, but a client that can open a plain TCP session on the ZooKeeper client port (2181 by default) - with NO authentication and NO ACL permissions - can delete any empty persistent znode (including regular persistent nodes, container nodes, and TTL nodes) by issuing the raw protocol OpCode deleteContainer (20). The deleteCon
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