DNS CVE-2026-24281
HIGH
GHSA-7xrh-hqfc-g7qr
CVSS VectorNVD
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Lifecycle Timeline
3Blast Radius
ecosystem impact- 460 maven packages depend on org.apache.zookeeper:zookeeper (89 direct, 372 indirect)
Ecosystem-wide dependent count for version 3.8.0.
DescriptionNVD
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.
AnalysisAI
Hostname verification bypass in Apache ZooKeeper's ZKTrustManager allows attackers with a valid certificate trusted by the server to impersonate ZooKeeper nodes by exploiting fallback to reverse DNS validation when IP SAN checks fail. An attacker controlling or spoofing PTR records can intercept and forge communications between ZooKeeper servers and clients, compromising confidentiality and integrity of the cluster. …
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RemediationAI
Within 24 hours: Inventory all ZooKeeper instances and document network exposure; assess whether PTR records are controlled by trusted infrastructure. Within 7 days: Implement network segmentation to restrict ZooKeeper communication to trusted internal networks only; disable reverse DNS lookups in ZooKeeper configuration if possible. …
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