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  4. CVE 2026 93011 dnsmasq dnsmasq heap out of bounds write in
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Back to active CVEs
Medium · CVSS 5.3CVE-2026-93011

Dnsmasq: dnsmasq: heap out-of-bounds write in dnssec validator via to_wire/from_wire transformsCVE-2026-93011

Answer in brief

CVE-2026-93011 records a Medium severity (CVSS 5.3) vulnerability in Dnsmasq: dnsmasq: heap out-of-bounds write in dnssec validator via to_wire/from_wire transforms. 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 5.3
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 5.3. 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 enable --dnssec or --trust-anchor unless DNSSEC validation is required. 2. Omit -DHAVE_DNSSEC from COPTS (this is the default build). 3. If DNSSEC validation is required, restrict dnsmasq to trusted upstream resolvers.

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. After a reduction of internal domain-name buffer sizes, the DNSSEC validator can write a few bytes past a name buffer when converting names to and from DNS wire format. An attacker who can cause the server to validate a crafted DNSSEC response may overwrite a small amount of adjacent heap metadata. DNSSEC support is not compiled in by default and must also be enabled at runtime.

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
Memory Corruption
EPSS
Not reported
CWE IDs
CWE-787
Source
CVE List V5
Source checked
Oct 29, 2026
References
2 linked sources
Open source record