CVEvulnerability

CVE-2026-24281

7.4 HIGH Published 2026-03-07 Modified 2026-07-15 Official page ↗
Status
Modified
Published
2026-03-07
Last modified
2026-07-15
Assigner
[email protected]
CVSS 3.1 ([email protected])
7.4 HIGH — CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
CVSS 3.1 (134c704f-9b21-4f2e-91b3-4a467353bcc0)
5.9 MEDIUM — CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
CVSS 3.1 (0b0ca135-0b70-47e7-9f44-1890c2a1c46c)
7.4 HIGH — CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Weaknesses
CWE-295, CWE-350

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.

Affected configurations

• apache zookeeper (>= 3.8.0 < 3.8.6) • apache zookeeper (>= 3.9.0 < 3.9.5)

Related

Weakness · CWE (2)

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

References