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High severityNVD Advisory· Published Mar 7, 2026· Updated Mar 10, 2026

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

CVE-2026-24281

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.

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Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
org.apache.zookeeper:zookeeperMaven
>= 3.8.0, < 3.8.63.8.6
org.apache.zookeeper:zookeeperMaven
>= 3.9.0, < 3.9.53.9.5

Affected products

46

Patches

Vulnerability mechanics

References

6

News mentions

0

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