CVE catalog

CVE-2026-79993

Severity: Critical · CVSS 9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Published: Sep 16, 2026, 9:27:22 AM UTC
Updated: Sep 16, 2026, 10:16:53 AM UTC
Source: [NVD] · [CVE record]
EPSS: 0.60% · Oct 25, 2026

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.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	zookeeper	sid	`3.9.6-2`	fixed
Debian	zookeeper	forky	`3.9.6-2`	fixed
Debian	zookeeper	trixie	`3.9.3-1+deb13u1`	vulnerable
Debian	zookeeper	bookworm	`3.8.0-11+deb12u2`	vulnerable
Debian	zookeeper	bookworm-security	`3.8.0-11+deb12u1`	vulnerable
Cpe	zookeeper	Not reported	`3.9.6`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	zookeeper	source	sid	`3.9.6-1`	not yet assigned	Not reported	[1148409]
Debian	zookeeper	source	forky	`3.9.6-1`	not yet assigned	Not reported	[1148409]
Debian	zookeeper	source	trixie	`(unfixed)`	not yet assigned	Not reported	[1148409]
Debian	zookeeper	source	bookworm	`(unfixed)`	not yet assigned	Not reported	[1148409]
Cpe	zookeeper	cpe	Not reported	`3.9.6`	Not reported	NVD-CVE-2026-79993	Not reported

[Debian bug #1148409]

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[libzookeeper-java]Affected
Source package: [zookeeper]
Details (4)
- 3.8.0-11+deb12u2 · all · bookworm
  Affected
  nvd · zookeeper · debian · bookworm; nvd · zookeeper · debian · 12
- 3.8.0-11+deb12u2 · all · bookworm
  Affected
  nvd · zookeeper · debian · bookworm; nvd · zookeeper · debian · 12
- 3.8.0-11+deb12u1 · all · bookworm-security
  Affected
  nvd · zookeeper · debian · bookworm; nvd · zookeeper · debian · 12
- 3.8.0-11+deb12u1 · all · bookworm-security
  Affected
  nvd · zookeeper · debian · bookworm; nvd · zookeeper · debian · 12
[libzookeeper-java-doc]Affected
Source package: [zookeeper]
Details (4)
- 3.8.0-11+deb12u2 · all · bookworm
  Affected
  nvd · zookeeper · debian · bookworm; nvd · zookeeper · debian · 12
- 3.8.0-11+deb12u2 · all · bookworm
  Affected
  nvd · zookeeper · debian · bookworm; nvd · zookeeper · debian · 12
- 3.8.0-11+deb12u1 · all · bookworm-security
  Affected
  nvd · zookeeper · debian · bookworm; nvd · zookeeper · debian · 12
- 3.8.0-11+deb12u1 · all · bookworm-security
  Affected
  nvd · zookeeper · debian · bookworm; nvd · zookeeper · debian · 12
[libzookeeper-mt2]Affected
Source package: [zookeeper]
Details (4)
- 3.8.0-11+deb12u2 · amd64 · bookworm
  Affected
  nvd · zookeeper · debian · bookworm; nvd · zookeeper · debian · 12
- 3.8.0-11+deb12u2 · arm64 · bookworm
  Affected
  nvd · zookeeper · debian · bookworm; nvd · zookeeper · debian · 12
- 3.8.0-11+deb12u1 · amd64 · bookworm-security
  Affected
  nvd · zookeeper · debian · bookworm; nvd · zookeeper · debian · 12
- 3.8.0-11+deb12u1 · arm64 · bookworm-security
  Affected
  nvd · zookeeper · debian · bookworm; nvd · zookeeper · debian · 12
[libzookeeper-mt-dev]Affected
Source package: [zookeeper]
Details (4)
- 3.8.0-11+deb12u2 · amd64 · bookworm
  Affected
  nvd · zookeeper · debian · bookworm; nvd · zookeeper · debian · 12
- 3.8.0-11+deb12u2 · arm64 · bookworm
  Affected
  nvd · zookeeper · debian · bookworm; nvd · zookeeper · debian · 12
- 3.8.0-11+deb12u1 · amd64 · bookworm-security
  Affected
  nvd · zookeeper · debian · bookworm; nvd · zookeeper · debian · 12
- 3.8.0-11+deb12u1 · arm64 · bookworm-security
  Affected
  nvd · zookeeper · debian · bookworm; nvd · zookeeper · debian · 12
[libzookeeper-st2]Affected
Source package: [zookeeper]
Details (4)
- 3.8.0-11+deb12u2 · amd64 · bookworm
  Affected
  nvd · zookeeper · debian · bookworm; nvd · zookeeper · debian · 12
- 3.8.0-11+deb12u2 · arm64 · bookworm
  Affected
  nvd · zookeeper · debian · bookworm; nvd · zookeeper · debian · 12
- 3.8.0-11+deb12u1 · amd64 · bookworm-security
  Affected
  nvd · zookeeper · debian · bookworm; nvd · zookeeper · debian · 12
- 3.8.0-11+deb12u1 · arm64 · bookworm-security
  Affected
  nvd · zookeeper · debian · bookworm; nvd · zookeeper · debian · 12
[libzookeeper-st-dev]Affected
Source package: [zookeeper]
Details (4)
- 3.8.0-11+deb12u2 · amd64 · bookworm
  Affected
  nvd · zookeeper · debian · bookworm; nvd · zookeeper · debian · 12
- 3.8.0-11+deb12u2 · arm64 · bookworm
  Affected
  nvd · zookeeper · debian · bookworm; nvd · zookeeper · debian · 12
- 3.8.0-11+deb12u1 · amd64 · bookworm-security
  Affected
  nvd · zookeeper · debian · bookworm; nvd · zookeeper · debian · 12
- 3.8.0-11+deb12u1 · arm64 · bookworm-security
  Affected
  nvd · zookeeper · debian · bookworm; nvd · zookeeper · debian · 12
[python3-zookeeper]Affected
Source package: [zookeeper]
Details (4)
- 3.8.0-11+deb12u2 · amd64 · bookworm
  Affected
  nvd · zookeeper · debian · bookworm; nvd · zookeeper · debian · 12
- 3.8.0-11+deb12u2 · arm64 · bookworm
  Affected
  nvd · zookeeper · debian · bookworm; nvd · zookeeper · debian · 12
- 3.8.0-11+deb12u1 · amd64 · bookworm-security
  Affected
  nvd · zookeeper · debian · bookworm; nvd · zookeeper · debian · 12
- 3.8.0-11+deb12u1 · arm64 · bookworm-security
  Affected
  nvd · zookeeper · debian · bookworm; nvd · zookeeper · debian · 12
[zookeeper]Affected
Details (4)
- 3.8.0-11+deb12u2 · all · bookworm
  Affected
  nvd · zookeeper · debian · bookworm; nvd · zookeeper · debian · 12
- 3.8.0-11+deb12u2 · all · bookworm
  Affected
  nvd · zookeeper · debian · bookworm; nvd · zookeeper · debian · 12
- 3.8.0-11+deb12u1 · all · bookworm-security
  Affected
  nvd · zookeeper · debian · bookworm; nvd · zookeeper · debian · 12
- 3.8.0-11+deb12u1 · all · bookworm-security
  Affected
  nvd · zookeeper · debian · bookworm; nvd · zookeeper · debian · 12
[zookeeper-bin]Affected
Source package: [zookeeper]
Details (4)
- 3.8.0-11+deb12u2 · amd64 · bookworm
  Affected
  nvd · zookeeper · debian · bookworm; nvd · zookeeper · debian · 12
- 3.8.0-11+deb12u2 · arm64 · bookworm
  Affected
  nvd · zookeeper · debian · bookworm; nvd · zookeeper · debian · 12
- 3.8.0-11+deb12u1 · amd64 · bookworm-security
  Affected
  nvd · zookeeper · debian · bookworm; nvd · zookeeper · debian · 12
- 3.8.0-11+deb12u1 · arm64 · bookworm-security
  Affected
  nvd · zookeeper · debian · bookworm; nvd · zookeeper · debian · 12
[zookeeperd]Affected
Source package: [zookeeper]
Details (4)
- 3.8.0-11+deb12u2 · all · bookworm
  Affected
  nvd · zookeeper · debian · bookworm; nvd · zookeeper · debian · 12
- 3.8.0-11+deb12u2 · all · bookworm
  Affected
  nvd · zookeeper · debian · bookworm; nvd · zookeeper · debian · 12
- 3.8.0-11+deb12u1 · all · bookworm-security
  Affected
  nvd · zookeeper · debian · bookworm; nvd · zookeeper · debian · 12
- 3.8.0-11+deb12u1 · all · bookworm-security
  Affected
  nvd · zookeeper · debian · bookworm; nvd · zookeeper · debian · 12

[Debian 13 (Trixie)]

[libzookeeper-java]Affected
Source package: [zookeeper]
Details (2)
- 3.9.3-1+deb13u1 · all · trixie
  Affected
  nvd · zookeeper · debian · 13
- 3.9.3-1+deb13u1 · all · trixie
  Affected
  nvd · zookeeper · debian · 13
[libzookeeper-java-doc]Affected
Source package: [zookeeper]
Details (2)
- 3.9.3-1+deb13u1 · all · trixie
  Affected
  nvd · zookeeper · debian · 13
- 3.9.3-1+deb13u1 · all · trixie
  Affected
  nvd · zookeeper · debian · 13
[libzookeeper-mt2]Affected
Source package: [zookeeper]
Details (2)
- 3.9.3-1+deb13u1 · amd64 · trixie
  Affected
  nvd · zookeeper · debian · 13
- 3.9.3-1+deb13u1 · arm64 · trixie
  Affected
  nvd · zookeeper · debian · 13
[libzookeeper-mt-dev]Affected
Source package: [zookeeper]
Details (2)
- 3.9.3-1+deb13u1 · amd64 · trixie
  Affected
  nvd · zookeeper · debian · 13
- 3.9.3-1+deb13u1 · arm64 · trixie
  Affected
  nvd · zookeeper · debian · 13
[libzookeeper-st2]Affected
Source package: [zookeeper]
Details (2)
- 3.9.3-1+deb13u1 · amd64 · trixie
  Affected
  nvd · zookeeper · debian · 13
- 3.9.3-1+deb13u1 · arm64 · trixie
  Affected
  nvd · zookeeper · debian · 13
[libzookeeper-st-dev]Affected
Source package: [zookeeper]
Details (2)
- 3.9.3-1+deb13u1 · amd64 · trixie
  Affected
  nvd · zookeeper · debian · 13
- 3.9.3-1+deb13u1 · arm64 · trixie
  Affected
  nvd · zookeeper · debian · 13
[python3-zookeeper]Affected
Source package: [zookeeper]
Details (2)
- 3.9.3-1+deb13u1 · amd64 · trixie
  Affected
  nvd · zookeeper · debian · 13
- 3.9.3-1+deb13u1 · arm64 · trixie
  Affected
  nvd · zookeeper · debian · 13
[zookeeper]Affected
Details (2)
- 3.9.3-1+deb13u1 · all · trixie
  Affected
  nvd · zookeeper · debian · 13
- 3.9.3-1+deb13u1 · all · trixie
  Affected
  nvd · zookeeper · debian · 13
[zookeeper-bin]Affected
Source package: [zookeeper]
Details (2)
- 3.9.3-1+deb13u1 · amd64 · trixie
  Affected
  nvd · zookeeper · debian · 13
- 3.9.3-1+deb13u1 · arm64 · trixie
  Affected
  nvd · zookeeper · debian · 13
[zookeeperd]Affected
Source package: [zookeeper]
Details (2)
- 3.9.3-1+deb13u1 · all · trixie
  Affected
  nvd · zookeeper · debian · 13
- 3.9.3-1+deb13u1 · all · trixie
  Affected
  nvd · zookeeper · debian · 13

Observed: Oct 23, 2026, 9:09:51 PM UTC

References

[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX]