DEBIAN-CVE-2026-24281
Hostname verification in Apache ZooKeeper ZKTrustManager falls back to reverse DNS (PTR) when IP SAN validation fails, allowing attackers who control or spoof PTR records to impersonate ZooKeeper servers or clients with a valid certificate for the PTR name. It's important to note that attacker must present a certificate which is trusted by ZKTrustManager which makes the attack vector harder to exploit. Users are recommended to upgrade to version 3.8.6 or 3.9.5, which fixes this issue by introducing a new configuration option to disable reverse DNS lookup in client and quorum protocols.
DEBIAN-CVE-2026-24281
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-2026-24281
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/versions - Fixed versions
- 3.9.5-1
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-2026-24281.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-2026-24281.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.9.5-1"
}
]
}
],
"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"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-24281.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
]Publisher severity
No explicit severity was provided.
- Event
- #55886 · Revision 1
- Added to Heist Feed
- Publisher date