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CVE-2026-24281

Apache ZooKeeper: Reverse-DNS fallback enables hostname verification bypass in ZooKeeper ZKTrustManager

Published: Mar 7, 2026Updated: Jul 15, 2026 Sources: CVE List NVDCWE-295
7.4HIGH
NVD MITRE
EPSS Score
0.6%
Top 53.0%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
OpenVAS

Description

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:HPR:NUI:NS:UC:HI:HA:N
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:NAvailability
None
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Weaknesses

CWE-295CWE-350

Affected Products

apache
oss-project·USaka apache http server, apache httpd
zookeeperOn-premDatabase
Databases / cache-message-queue
Apache Software Foundation
oss-project·USaka apache foundation
Apache ZooKeeperOn-premWeb App
Databases / cache-message-queue

Exploitability

Official Patch Available
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique
Collection
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References

https://lists.apache.org/thread/088ddsbrzhd5lxzbqf5n24yg0mwh9jt2
lists.apache.org
http://www.openwall.com/lists/oss-security/2026/03/07/4
openwall.com
https://access.redhat.com/errata/RHSA-2026:10184
access.redhat.com
and 7 more references View all →

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