CVE-2026-24281
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
Summary
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 Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Apache Software Foundation | Apache ZooKeeper | 3.9.0 <= 3.9.4 | affected |
| Apache Software Foundation | Apache ZooKeeper | 3.8.0 <= 3.8.5 | affected |
Weaknesses
- CWE-350: CWE-350 Reliance on Reverse DNS Resolution for a Security-Critical Action
- CWE-295: CWE-295 Improper Certificate Validation
ADP Enrichment
CVE Program Container
Additional References
CISA ADP Vulnrichment
- SSVC:
- Exploitation: none
- Automatable: no
- Technical Impact: partial
Apache ZooKeeper: Apache ZooKeeper: Impersonation of servers or clients via reverse DNS spoofing
Additional References
- https://access.redhat.com/security/cve/CVE-2026-24281
- https://bugzilla.redhat.com/show_bug.cgi?id=2445449
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-24281.json
- https://access.redhat.com/errata/RHSA-2026:14276
- https://access.redhat.com/errata/RHSA-2026:14272
- https://access.redhat.com/errata/RHSA-2026:8509
- https://access.redhat.com/errata/RHSA-2026:10184
- https://access.redhat.com/errata/RHSA-2026:34608
References
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