Vulnerability CVE-2026-24281: Information

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.

Severity: HIGH (7.4)

Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

URL: https://nvd.nist.gov/vuln/detail/CVE-2026-24281

Published: March 7, 2026

Modified: March 10, 2026

Error type identifier: CWE-295

Fixed packages

Package name	Branch	Fixed in version	Version from repository	Errata ID	Task #	State
kafka	sisyphus	4.2.0-alt2	4.2.0-alt4	ALT-PU-2026-5782-1	414376	Fixed
kafka	sisyphus_loongarch64	4.2.0-alt3	4.2.0-alt4	ALT-PU-2026-5915-1	-	Fixed
kafka	c10f2	4.2.0-alt3	3.9.1-alt2.c10.1	ALT-PU-2026-5788-1	414377	Testing

References to Advisories, Solutions, and Tools

Hyperlink	Resource
https://lists.apache.org/thread/088ddsbrzhd5lxzbqf5n24yg0mwh9jt2	Mailing List Vendor Advisory
http://www.openwall.com/lists/oss-security/2026/03/07/4	Mailing List Third Party Advisory
GHSA-7xrh-hqfc-g7qr

Affected configurations:
1. cpe:2.3:a:apache:zookeeper:*:*:*:*:*:*:*:*
  Start including
  3.8.0
  End excluding
  3.8.6
  cpe:2.3:a:apache:zookeeper:*:*:*:*:*:*:*:*
  Start including
  3.9.0
  End excluding
  3.9.5

Version: v26.2.2