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  4. CVE 2026 93009 dnsmasq dnsmasq heap out of bounds read in dhcpv6
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Back to active CVEs
Medium · CVSS 4.3CVE-2026-93009

Dnsmasq: dnsmasq: heap out-of-bounds read in dhcpv6 option 39 fqdn decoderCVE-2026-93009

Answer in brief

CVE-2026-93009 records a Medium severity (CVSS 4.3) vulnerability in Dnsmasq: dnsmasq: heap out-of-bounds read in dhcpv6 option 39 fqdn decoder. 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 4.3
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 4.3. 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. If DHCPv6 is not required, do not configure any IPv6 dhcp-range. 2. Compile without DHCPv6 using COPTS=-DNO_DHCP6 if IPv6 DHCP is not needed. 3. Restrict dnsmasq to trusted interfaces with --interface=<iface>.

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. The DHCPv6 client hostname parser can read one byte past the end of a crafted FQDN option because it checks the next label length before confirming the pointer is still inside the option. An attacker on the local network can trigger this with a single DHCPv6 packet. The extra byte is not returned to the client or logged, and no crash has been demonstrated.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Dnsmasq: dnsmasq: --leasequery without address argument applies no source address checkSame red hat/dnsmasq package
  • lwIP 2.0.0 through 2.2.1 SNMP Agent Out-of-Bounds Read via snmp_pbuf_stream_writeto()Also CWE-125

Record context

Vulnerability class
Buffer Overflow
EPSS
Not reported
CWE IDs
CWE-125
Source
CVE List V5
Source checked
Oct 29, 2026
References
2 linked sources
Open source record