Bug 2445449 (CVE-2026-24281) - CVE-2026-24281 Apache ZooKeeper: Apache ZooKeeper: Impersonation of servers or clients via reverse DNS spoofing
Summary: CVE-2026-24281 Apache ZooKeeper: Apache ZooKeeper: Impersonation of servers o...
Keywords:
Status: NEW
Alias: CVE-2026-24281
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
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Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-03-07 09:01 UTC by OSIDB Bzimport
Modified: 2026-03-09 10:49 UTC (History)
39 users (show)

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Description OSIDB Bzimport 2026-03-07 09:01:20 UTC 
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.
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