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Back to active CVEs
Medium · CVSS 6.8CVE-2026-93008

Dnsmasq: dnsmasq: out-of-bailiwick cache injection through cname chase in split-dns configurationsCVE-2026-93008

Answer in brief

CVE-2026-93008 records a Medium severity (CVSS 6.8) vulnerability in Dnsmasq: dnsmasq: out-of-bailiwick cache injection through cname chase in split-dns configurations. The current sources do not mark it as known exploited. The current feed maps Red Hat/dnsmasq (generic), Red Hat/openshift4/ose-baremetal-runtimecfg-rhel8 (generic), Red Hat/openshift4/ose-baremetal-runtimecfg-rhel9 (generic), Red Hat/openshift/ose-rhel-coreos-8 (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 29, 2026Updated Oct 29, 2026Source checked Oct 29, 2026First seen by HOL Oct 29, 2026Material review Oct 29, 2026
Upstream Advisory

Key facts

Risk
Medium · CVSS 6.8
Exploitation
Not marked as known exploited
Affected software
7 mapped packages or products
Fix availability
Not reported

Why this deserves its current priority

CVSS is 6.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Red Hat/dnsmasq (generic), Red Hat/openshift4/ose-baremetal-runtimecfg-rhel8 (generic), Red Hat/openshift4/ose-baremetal-runtimecfg-rhel9 (generic), Red Hat/openshift/ose-rhel-coreos-8 (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Red Hat/dnsmasqgeneric*Not reported
Red Hat/openshift4/ose-baremetal-runtimecfg-rhel8generic*Not reported
Red Hat/openshift4/ose-baremetal-runtimecfg-rhel9generic*Not reported
Red Hat/openshift/ose-rhel-coreos-8generic*Not reported
Red Hat/openshift/ose-rhel-coreos-9generic*Not reported
Red Hat/rhceph/alloy-rhel10generic*Not reported
Red Hat/rhoso-operators/infra-rhel9-operatorgeneric*Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Red Hat/dnsmasq, Red Hat/openshift4/ose-baremetal-runtimecfg-rhel8, Red Hat/openshift4/ose-baremetal-runtimecfg-rhel9.
  2. 2Review the reported fix. Source-reported workaround: The following measures reduce risk: 1. Do not point server=/domain/ at untrusted or attacker-reachable DNS servers. 2. Restrict dnsmasq to communicate only with trusted upstream resolvers at the firewall. 3. For local=/domain/ zones, define all names that should be served locally. 4. Do not rely on --dnssec to mitigate this for unsigned zones. Insecure records are still cached.

Evidence timeline and material changes

  1. Published upstream

    Oct 29, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 29, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 29, 2026

Sources and claim methodology

  • Source referenceaccess.redhat.com
  • Source referencebugzilla.redhat.com
Upstream source description

A flaw was found in dnsmasq. When following a CNAME in a DNS response, the resolver can cache records for the CNAME target without checking that those records belong to the responding server's authorized zone. In split-DNS deployments that send some domains to a specific upstream, an attacker who controls that upstream can inject cache entries for unrelated names. Later clients may then receive attacker-chosen addresses for those names.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Dnsmasq: dnsmasq: heap out-of-bounds read in dhcpv6 option 39 fqdn decoderSame red hat/dnsmasq package
  • Dnsmasq: dnsmasq: --leasequery without address argument applies no source address checkSame red hat/dnsmasq package

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-345
Source
CVE List V5
Source checked
Oct 29, 2026
References
2 linked sources
Open source record