VULNERABILITY INTELLIGENCE

CVE-2026-24281

CVSS score7.4 HIGH
EPSS probability0.65%
CISA KEVNot currently listed
Published2026-03-07
Last modified2026-07-15
CVSS vectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

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.

Weakness classification

  • CWE-295: Improper Certificate Validation
  • CWE-350: Reliance on Reverse DNS Resolution for a Security-Critical Action

Primary references