CVE-2026-79993

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This opcode is considered internal-only and the official client doesn't have API for it, but a\u00a0client that can open a plain TCP session on the ZooKeeper client port (2181 by default)\u00a0- with NO authentication and NO ACL permissions - can delete any\u00a0empty persistent znode (including regular persistent nodes, container\u00a0nodes, and TTL nodes) by issuing the raw protocol OpCode deleteContainer (20).\u00a0The deleteContainer request path completely skips both the session check and\u00a0the DELETE ACL check that are enforced by the regular delete (OpCode 2) path.\u00a0This is an authorization bypass / ACL enforcement bug.\n\nThis issue affects Apache ZooKeeper: from 3.9.0 through 3.9.5, from 3.8.0 through 3.8.6.\n\nUsers are recommended to upgrade to version 3.9.6 or 3.8.7, which fixes the issue.", "lang": "en", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p><span>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&nbsp;</span><span>client that can open a plain TCP session on the ZooKeeper client port (2181 by default)&nbsp;</span><span>- with NO authentication and NO ACL permissions - can delete any</span><span>&nbsp;empty persistent znode (including regular persistent nodes, container&nbsp;</span><span>nodes, and TTL nodes) by issuing the raw protocol OpCode deleteContainer (20).&nbsp;</span><span>The deleteContainer request path completely skips both the session check and&nbsp;</span><span>the DELETE ACL check that are enforced by the regular delete (OpCode 2) path.&nbsp;</span><span>This is an authorization bypass / ACL enforcement bug.<br></span><span><br>This issue affects Apache ZooKeeper: from 3.9.0 through 3.9.5, from 3.8.0 through 3.8.6.<br></span><span><br>Users are recommended to upgrade to version 3.9.6 or 3.8.7, which fixes the issue.</span></p>"}]}], "references": [{"url": "https://lists.apache.org/thread/9cw3rmrzhqpct26v8j18fy41bghlq8y5", "tags": ["vendor-advisory"]}], "metrics": [{"other": {"type": "Textual description of severity", "content": {"text": "critical"}}, "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "credits": [{"lang": "en", "value": "K <sec-reports@outlook.com>", "type": "reporter"}, {"lang": "en", "value": "z f <tinkerzf@gmail.com>", "type": "reporter"}, {"lang": "en", "value": "\u5e03\u8c6a <1958304602@qq.com>", "type": "finder"}], "x_generator": {"engine": "Vulnogram 1.0.3"}}, "adp": [{"title": "CVE Program Container", "references": [{"url": "http://www.openwall.com/lists/oss-security/2026/09/15/5"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2026-09-16T10:11:55.778Z"}}, {"metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.5, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}}, {"other": {"type": "ssvc", "content": {"timestamp": "2026-09-17T19:15:43.099911Z", "id": "CVE-2026-79993", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-09-17T19:16:04.241Z"}}]}}

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This opcode is considered internal-only and the official client doesn't have API for it, but a&nbsp;</span><span>client that can open a plain TCP session on the ZooKeeper client port (2181 by default)&nbsp;</span><span>- with NO authentication and NO ACL permissions - can delete any</span><span>&nbsp;empty persistent znode (including regular persistent nodes, container&nbsp;</span><span>nodes, and TTL nodes) by issuing the raw protocol OpCode deleteContainer (20).&nbsp;</span><span>The deleteContainer request path completely skips both the session check and&nbsp;</span><span>the DELETE ACL check that are enforced by the regular delete (OpCode 2) path.&nbsp;</span><span>This is an authorization bypass / ACL enforcement bug.<br></span><span><br>This issue affects Apache ZooKeeper: from 3.9.0 through 3.9.5, from 3.8.0 through 3.8.6.<br></span><span><br>Users are recommended to upgrade to version 3.9.6 or 3.8.7, which fixes the issue.</span></p>", "base64": false}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-862", "description": "CWE-862 Missing Authorization"}]}], "providerMetadata": {"orgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09", "shortName": "apache", "dateUpdated": "2026-09-16T09:27:22.516Z"}}}, "cveMetadata": {"cveId": "CVE-2026-79993", "state": "PUBLISHED", "dateUpdated": "2026-09-16T10:11:55.778Z", "dateReserved": "2026-08-25T16:40:35.796Z", "assignerOrgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09", "datePublished": "2026-09-16T09:27:22.516Z", "assignerShortName": "apache"}, "dataVersion": "5.2"}

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