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CVE-2026-24281

7.4 · HIGH

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 s…

Published Mar 7, 2026CWE-295EPSS 0.65%

Overview

CVE-2026-24281 is a high-severity vulnerability. It was published on March 7, 2026 and has a CVSS 3.1 base score of 7.4 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.4, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Reflists.apache.org/thread/088ddsbrzhd5lxzbqf5n24yg0mwh9jt2Refwww.openwall.com/lists/oss-security/2026/03/07/4Refaccess.redhat.com/errata/RHSA-2026:10184Refaccess.redhat.com/errata/RHSA-2026:14272Refaccess.redhat.com/errata/RHSA-2026:14276Refaccess.redhat.com/errata/RHSA-2026:34608Refaccess.redhat.com/errata/RHSA-2026:8509Refaccess.redhat.com/security/cve/CVE-2026-24281Refbugzilla.redhat.com/show_bug.cgi?id=2445449Refsecurity.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-24281.json

How CyberStrike helps

Frequently asked questions

What is CVE-2026-24281?

CVE-2026-24281 is a high-severity vulnerability. It was published on March 7, 2026 and has a CVSS 3.1 base score of 7.4 (HIGH).

How severe is CVE-2026-24281?

This vulnerability has a CVSS 3.1 base score of 7.4, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-24281?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-24281?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-24281 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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