CVE-2017-5637

CVE-2017-5637 affects Apache ZooKeeper prior to fixes in 3.4.10 and 3.5.3. The issue: two four-letter commands, wchp and wchc, are CPU-intensive and can cause a denial of service by overwhelming CPU on the server, rendering it unable to serve legitimate clients. Affected products/versions include...

CVE-2026-24308

CVE-2026-24308 affects Apache ZooKeeper: improper handling of configuration values in ZKConfig can expose sensitive client configuration in logs at INFO level. Affected: ZooKeeper 3.8.5 and 3.9.4 on all platforms. Impact: potential leakage of sensitive config data in production logs. Mitigation: ...

CVE-2018-8012

CVE-2018-8012 affects Apache ZooKeeper: no authentication/authorization is enforced when a server attempts to join a quorum (before 3.4.10 and 3.5.0-alpha to 3.5.3-beta). This allows an arbitrary endpoint to join the cluster and propagate counterfeit changes to the leader. IBM and related advisor...

CVE-2026-24281

CVE-2026-24281 — Apache ZooKeeper ZKTrustManager reverse DNS fallback . The vulnerability arises when IP SAN validation fails and ZKTrustManager falls back to PTR-based name resolution, enabling attackers who control or spoof PTR records to impersonate ZooKeeper servers or clients with certificat...