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Fencer Vulns
high 7.5

CVE-2026-79993 json

Apache ZooKeeper: Missing ACL check on deleteContainer opcode allows unauthorized deletion of any empty persistent/container znode

published 2026-09-16 54 d ago modified 2026-09-19 51 d ago also BIT-zookeeper-2026-79993 , EUVD-2026-80332

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 49%
public exploits
0
none known

Summary

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 deleteContainer request path completely skips both the session check and the DELETE ACL check that are enforced by the regular delete (OpCode 2) path. This is an authorization bypass / ACL enforcement bug.

This issue affects Apache ZooKeeper: from 3.9.0 through 3.9.5, from 3.8.0 through 3.8.6.

Users are recommended to upgrade to version 3.9.6 or 3.8.7, which fixes the issue.

Patch / fix

  • bitnami zookeeper 3.8.7, 3.9.6
  • apache zookeeper 3.8.7, 3.9.6
  • zookeeper Debian 14 3.9.6-1

debian advisories DEBIAN-CVE-2026-79993

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-79993 updated cvss 9.1

zookeeper: Apache ZooKeeper: Unauthorized znode deletion via missing ACL check

  • Red Hat AMQ Broker 7 zookeeper Red Hat build of Apache Camel for Spring Boot 4 zookeeper Red Hat build of Debezium 3 zookeeper
    affected: workaround, no fix available
  • Red Hat Data Grid 8 zookeeper Red Hat Fuse 7 zookeeper Red Hat JBoss Enterprise Application Platform 7 zookeeper
    affected: workaround, no fix planned “Will not fix”
  • Red Hat OpenShift AI (RHOAI) rhoai/odh-modelmesh-rhel9
    affected: workaround, no fix available
  • Red Hat Build of Debezium 3.6
    fixed: vendor fix RHSA-2026:83612
  • Red Hat JBoss Enterprise Application Platform 8 zookeeper
    not affected: component not present
  • Red Hat JBoss Enterprise Application Platform Expansion Pack zookeeper
    not affected: vulnerable code not present
  • Red Hat Offline Knowledge Portal offline-knowledge-portal/rhokp-rhel9
    not affected: vulnerable code not in execute path
  • Red Hat OpenShift AI (RHOAI) rhoai/odh-modelmesh-rhel8 Red Hat streams for Apache Kafka 2 zookeeper Red Hat streams for Apache Kafka 3 zookeeper
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
52 d ago

Exploit prediction

0.60% chance of exploitation in the next 30 days, higher than 49% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
OSV 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Affected packages

ecosystem package affected fixed in
bitnami zookeeper
>=3.8.0, <3.8.7
>=3.9.0, <3.9.6
3.8.7
3.9.6

Affected products

  • Apache Software Foundation Apache ZooKeeper

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.