DEBIAN-CVE-2026-59739
Information disclosure via SetWatches reconnect replay in Apache ZooKeeper due to missing ACL check. An attacker can discover ACL-restricted paths by registering exists-watches on non-existent paths, then reconnecting after the paths are created with restricted ACLs. Issue is caused by incomplete fix for CVE-2024-23944 (ZOOKEEPER-4799). The fix added ACL checking to WatchManager.triggerWatch(). However, DataTree.setWatches() — the SetWatches/SetWatches2 reconnect replay handler — still calls watcher.process(event) with null ACL, bypassing the check entirely. It's important to note that only the path is exposed by this vulnerability, not the data of znode, but since znode path can contain sensitive information like user name or login ID, this issue is potentially critical. Users are recommended to upgrade to version 3.9.6, 3.8.7 which fixes the issue.
DEBIAN-CVE-2026-59739
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: osv:DEBIAN-CVE-2026-59739
zookeeper
Source reference: /affected/0/package/name
- Affected versions
- 3.8.0-11
Source reference:
/affected/0/versions3.8.0-11+deb12u1Source reference:
/affected/0/versions3.8.0-11+deb12u2Source reference:
/affected/0/versions3.9.1-1Source reference:
/affected/0/versions3.9.2-1Source reference:
/affected/0/versions3.9.2-2Source reference:
/affected/0/versions3.9.3-1Source reference:
/affected/0/versions3.9.3-2Source reference:
/affected/0/versions3.9.4-1Source reference:
/affected/0/versions3.9.4-2Source reference:
/affected/0/versions3.9.5-1Source reference:
/affected/0/versions3.9.5-2Source reference:
/affected/0/versions3.9.6-1Source reference:
/affected/0/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
zookeeper
Source reference: /affected/1/package/name
- Affected versions
- 3.9.3-1
Source reference:
/affected/1/versions3.9.3-1+deb13u1Source reference:
/affected/1/versions3.9.3-2Source reference:
/affected/1/versions3.9.4-1Source reference:
/affected/1/versions3.9.4-2Source reference:
/affected/1/versions3.9.5-1Source reference:
/affected/1/versions3.9.5-2Source reference:
/affected/1/versions3.9.6-1Source reference:
/affected/1/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
zookeeper
Source reference: /affected/2/package/name
- Affected versions
- 3.9.3-1
Source reference:
/affected/2/versions3.9.3-2Source reference:
/affected/2/versions3.9.4-1Source reference:
/affected/2/versions3.9.4-2Source reference:
/affected/2/versions3.9.5-1Source reference:
/affected/2/versions3.9.5-2Source reference:
/affected/2/versions - Fixed versions
- 3.9.6-1
Source reference:
/affected/2/ranges - Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "zookeeper",
"purl": "pkg:deb/debian/zookeeper?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"3.8.0-11",
"3.8.0-11+deb12u1",
"3.8.0-11+deb12u2",
"3.9.1-1",
"3.9.2-1",
"3.9.2-2",
"3.9.3-1",
"3.9.3-2",
"3.9.4-1",
"3.9.4-2",
"3.9.5-1",
"3.9.5-2",
"3.9.6-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-59739.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "zookeeper",
"purl": "pkg:deb/debian/zookeeper?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"3.9.3-1",
"3.9.3-1+deb13u1",
"3.9.3-2",
"3.9.4-1",
"3.9.4-2",
"3.9.5-1",
"3.9.5-2",
"3.9.6-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-59739.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.9.6-1"
}
]
}
],
"package": {
"name": "zookeeper",
"purl": "pkg:deb/debian/zookeeper?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"3.9.3-1",
"3.9.3-2",
"3.9.4-1",
"3.9.4-2",
"3.9.5-1",
"3.9.5-2"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-59739.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
]Publisher severity
No explicit severity was provided.
- Event
- #58034 · Revision 1
- Added to Heist Feed
- Publisher date