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CVE-2026-24281— Apache ZooKeeper: Reverse-DNS fallback enables hostname verification bypass in ZooKeeper ZKTrustManager

Quick assessment

Affected
Apache Software Foundation Apache ZooKeeper
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Apache Zookeeper是美国阿帕奇（Apache）基金会的一个软件项目，它能够为大型分布式计算提供开源的分布式配置服务、同步服务和命名注册等功能。 Apache Zookeeper存在安全漏洞，该漏洞源于ZKTrustManager中的主机名验证在IP SAN验证失败时会回退到反向DNS查询，可能导致攻击者冒充服务器或客户端。

AI Predicted 6.5 Difficulty: Hard EPSS 0.63% · P49

Possible ATT&CK Techniques 1 AI

T1078 · Valid Accounts

Affected Version Matrix 2

VendorProduct Version RangeStatus
Apache Software Foundation Apache ZooKeeper 3.9.0≤ 3.9.4 affected
3.8.0≤ 3.8.5 affected
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I. Basic Information for CVE-2026-24281

Vulnerability Information
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Vulnerability Title
Apache ZooKeeper: Reverse-DNS fallback enables hostname verification bypass in ZooKeeper ZKTrustManager
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
不恰当地信任反向DNS
Source: CVE Program / CVE List V5
Vulnerability Title
Apache Zookeeper 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Apache Zookeeper是美国阿帕奇（Apache）基金会的一个软件项目，它能够为大型分布式计算提供开源的分布式配置服务、同步服务和命名注册等功能。 Apache Zookeeper存在安全漏洞，该漏洞源于ZKTrustManager中的主机名验证在IP SAN验证失败时会回退到反向DNS查询，可能导致攻击者冒充服务器或客户端。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Apache Software Foundation Apache ZooKeeper 3.9.0 ~ 3.9.4 -

II. Public POCs for CVE-2026-24281

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III. Intelligence Information for CVE-2026-24281

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Mailing List Discussions for CVE-2026-24281 (1)

IV. Related Vulnerabilities

Same product: Apache ZooKeeper
Same vendor: Apache Software Foundation
Same weakness: CWE-350

V. Comments for CVE-2026-24281

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