# CVE-2026-93010: Dnsmasq: dnsmasq: --leasequery without address argument applies no source address check

Status: published. Published: 2026-10-29. Updated: 2026-11-06.

A flaw was found in dnsmasq. When DHCP leasequery is enabled without listing allowed source addresses, the server does not check who sent the query. A host on the local network can request DHCP lease records and learn assigned addresses, MAC addresses, hostnames, and related lease metadata. The feature is off unless an administrator turns it on.

## Remediation

- workaround: The following measures reduce risk:

1. Prefer --leasequery=<addr>[/prefix] so only designated relays may query.
2. If leasequery is not needed, do not enable it. It is off by default.
3. If unrestricted leasequery is required, use firewall rules to limit which hosts can send DHCP packets to dnsmasq. (source: CNA: redhat)

## Affected products and versions

- Red Hat / Red Hat Ceph Storage 9 (rhceph/alloy-rhel10): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 10 (dnsmasq): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 6 (dnsmasq): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 7 (dnsmasq): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8 (dnsmasq): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9 (dnsmasq): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift Container Platform 4 (openshift4/ose-baremetal-runtimecfg-rhel8): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift Container Platform 4 (openshift4/ose-baremetal-runtimecfg-rhel9): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift Container Platform 4 (openshift/ose-rhel-coreos-8): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift Container Platform 4 (openshift/ose-rhel-coreos-9): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift Container Platform 5 (openshift5/ose-baremetal-runtimecfg-rhel9): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift Container Platform 5 (openshift/ose-rhel-coreos-9): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenStack Platform 13 (Queens) (dnsmasq): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenStack Platform 18.0 (rhoso-operators/infra-rhel9-operator): Version range not reported. Source: CNA: redhat

## Severity and prioritization

- CVSS 3.1: 4.3 (medium); CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N; source: CNA: redhat

- CVSS 3.1: 4.3 (medium); CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N; source: NVD: secalert@redhat.com

- CISA KEV: No listing in collected sources

- EPSS: 0.19% as of 2026-11-06; percentile 8.93%

- SSVC: exploitation none; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-862

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://access.redhat.com/security/cve/CVE-2026-93010 (CNA: redhat; vdb-entry, x_refsource_REDHAT)

- https://bugzilla.redhat.com/show_bug.cgi?id=2536081 (CNA: redhat; issue-tracking, x_refsource_REDHAT)

- https://access.redhat.com/security/cve/CVE-2026-93010 (secalert@redhat.com)

- https://bugzilla.redhat.com/show_bug.cgi?id=2536081 (secalert@redhat.com)

## Provenance

- CNA: redhat: https://www.cve.org/CVERecord?id=CVE-2026-93010; retrieved 2026-11-06; source updated 2026-11-06

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-93010; retrieved 2026-11-03; source updated 2026-11-03

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-93010; retrieved 2026-11-06; source updated Not reported

Revision: e6083ac35d83234fe3c2d0c3f1e14af27c93f4702739ac017c064f4f8d9ed523

Canonical: https://y2.dev/cve/CVE-2026-93010

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