cve.bz

CVE-2026-24281

7.4 highEPSS 0.6%

High (7.4) in apache zookeeper. EPSS 0.6% chance of exploitation in the next 30 days. Fixed in org.apache.zookeeper:zookeeper 3.8.6, 3.9.5.

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

CVSS 3.1

7.4 high
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
EPSS
0.6% chance of exploitation in the next 30 days; higher than 50% of CVEs (scores of 2026-10-31)
CWEs
CWE-295, CWE-350
Published
Modified
Record from
the NVD, synced

Affected

Packages (OSV)

AdvisoryEcosystemPackageAffectedFixed in
GHSA-7xrh-hqfc-g7qrMavenorg.apache.zookeeper:zookeeper>=3.8.0 <3.8.63.8.6
GHSA-7xrh-hqfc-g7qrMavenorg.apache.zookeeper:zookeeper>=3.9.0 <3.9.53.9.5

References

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