CVE-2026-24281
No exploitation reported by the sources we read.
- Published2026-03-07
- Fixed in3.9.5 · 3.8.6
- WeaknessCWE-295 · CWE-350
Am I affected?
Debian, Ubuntu or Red Hat sometimes backport a fix without changing the upstream version number: such a version reads « to verify », never « affected ».With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.
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.
Timeline
dates in UTC- 2026-03-0709:16CVE publishedNVD
Observed activity
isMalicious corpus · updated 2026-10-23 21:37 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-24281?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-24281?format=csv
- TAXII collection of exploited CVEs
- The EDL and CSV take an API key on the Pro plan.
Versions per branch
NVD · OSV| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 3.9 | ≥ 3.9.0, < 3.9.5 | 3.9.5 | NVD · OSV |
| 3.8 | ≥ 3.8.0, < 3.8.6 | 3.8.6 | NVD · OSV |
as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.
Distribution builds and vendor advisories
Packages from OSV.dev and products from the vendors' CSAF advisories.
version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.
Vendor advisories
Apache ZooKeeper: Apache ZooKeeper: Impersonation of servers or clients via reverse DNS spoofing
zookeeper as a component of Red Hat build of Debezium 2 · zookeeper as a component of Red Hat build of Debezium 3 · zookeeper as a component of Red Hat Fuse 7 · +4 more
Red Hat Security Advisory: Red Hat JBoss Enterprise Application Platform 8.1.8 XP 6.0.6.GA release
Red Hat Security Advisory: Streams for Apache Kafka 2.9.4 release and security update
Red Hat Security Advisory: Red Hat JBoss Enterprise Application Platform 8.1.6 XP 6.0.4.GA security release
Red Hat Security Advisory: Red Hat AMQ Broker 7.12.7 release and security update
Red Hat Security Advisory: Red Hat AMQ Broker 7.13.5 release and security update
2 more advisories
Fix
- Update Apache zookeeper to 3.9.5 · 3.8.6
- Vendor fix Red Hat Product Security RHSA-2026:70421 · 1 productBefore applying the update, make sure all previously released errata relevant to your system have been applied. Also, back up your existing installation, including all applications, configuration files, databases and database settings. For details on how to apply this update, refer to: https://acce…
- Vendor fix Red Hat Product Security RHSA-2026:34608 · 1 productBefore applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
- Vendor fix Red Hat Product Security RHSA-2026:14276 · 1 productBefore applying the update, back up your existing installation, including all applications, configuration files, databases and database settings. The References section of this erratum contains a download link (you must log in to download the update).
- Vendor fix Red Hat Product Security RHSA-2026:10184 · 2 productsFor Red Hat OpenShift AI 2.25.5 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this errata update: https://docs.redhat.com/en/documentation/red_hat_openshift_ai/
- Workaround from the vendor Red Hat Product Security RHSA-2026:70421 · 561 productsTo mitigate this issue, disable reverse DNS lookup in Apache ZooKeeper's client and quorum protocols. This can be achieved by configuring the `zookeeper.ssl.hostnameVerification.disableReverseDns` property to `true`. This configuration option is available in Apache ZooKeeper versions 3.8.6 and 3.9.…
- No fix available, says the vendor Red Hat Product Security CVE-2026-24281 · 3 productsAffected
Advisories and patches
- lists.apache.orgVendor Advisory
Detection
- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
- Proof-of-concept repositories
- none listed PoC-in-GitHub
Sources
Technical details
- CVSS v3 Vector
- CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
- Published
- 2026-03-07
- Last Modified
- 2026-07-15
- NVD status
- Modified
Frequently asked questions
What is CVE-2026-24281?
Is CVE-2026-24281 actively exploited?
What is the CVSS score for CVE-2026-24281?
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Related vulnerabilities
Same product first, then the same vendor advisory and the same publication week.