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.
CVE-2026-24281
NONE
EPSS 0.04%
Updated Mar 07, 2026
Apache
CVE Details
CVE ID
CVE-2026-24281
Published Date
Mar 07, 2026
Vendor
Apache
Severity
NONE
Exploit Prediction (EPSS)
Probability of Exploit
0.04%
Likelihood of exploitation in next 30 days
Percentile:
11.6th percentile (higher than 11.6% of all CVEs)
Standard patching cycle
Impact
Minimal impact
Source
View Advisory