CVE-2026-93008medium6.8

Dnsmasq: dnsmasq: out-of-bailiwick cache injection through cname chase in split-dns configurations

Impact

A flaw in dnsmasq allows an attacker controlling an upstream DNS server to inject cache entries for unrelated names in split-DNS configurations. The weakness is due to insufficient verification of data authenticity. Affected products include various Red Hat Enterprise Linux and OpenShift Container Platform versions.

Summarized by @cf/meta/llama-3.3-70b-instruct-fp8-fast. Verify details against the original sources.

What to do

The following measures reduce risk:

Do not point server=/domain/ at untrusted or attacker-reachable DNS servers.
Restrict dnsmasq to communicate only with trusted upstream resolvers at the firewall.
For local=/domain/ zones, define all names that should be served locally.
Do not rely on --dnssec to mitigate this for unsigned zones. Insecure records are still cached.

redhat guidance

Affected packages

This source has no supported package-version data for matching. You can read the advisory here, but this record alone cannot power a dependency check.

Affected products

Vendor version evidence. Product records are separate from automatic dependency matching.

Red Hat · redhat

Red Hat Ceph Storage 9

0 ranges

redhat version evidence

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Other versions: affected

Product identifiers (CPE)

cpe:/a:redhat:ceph_storage:9

Red Hat · redhat

Red Hat Enterprise Linux 10

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redhat version evidence

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Other versions: affected

Product identifiers (CPE)

cpe:/o:redhat:enterprise_linux:10

Red Hat · redhat

Red Hat Enterprise Linux 6

0 ranges

redhat version evidence

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Other versions: affected

Product identifiers (CPE)

cpe:/o:redhat:enterprise_linux:6

Red Hat · redhat

Red Hat Enterprise Linux 7

0 ranges

redhat version evidence

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Other versions: affected

Product identifiers (CPE)

cpe:/o:redhat:enterprise_linux:7

Red Hat · redhat

Red Hat Enterprise Linux 8

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redhat version evidence

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Other versions: affected

Product identifiers (CPE)

cpe:/o:redhat:enterprise_linux:8

Red Hat · redhat

Red Hat Enterprise Linux 9

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redhat version evidence

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Other versions: affected

Product identifiers (CPE)

cpe:/o:redhat:enterprise_linux:9

Red Hat · redhat

Red Hat OpenShift Container Platform 4

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redhat version evidence

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Other versions: affected

Product identifiers (CPE)

cpe:/a:redhat:openshift:4

Red Hat · redhat

Red Hat OpenShift Container Platform 4

0 ranges

redhat version evidence

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Other versions: affected

Product identifiers (CPE)

cpe:/a:redhat:openshift:4

Red Hat · redhat

Red Hat OpenShift Container Platform 4

0 ranges

redhat version evidence

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Other versions: affected

Product identifiers (CPE)

cpe:/a:redhat:openshift:4

Red Hat · redhat

Red Hat OpenShift Container Platform 4

0 ranges

redhat version evidence

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Other versions: affected

Product identifiers (CPE)

cpe:/a:redhat:openshift:4

Red Hat · redhat

Red Hat OpenShift Container Platform 5

0 ranges

redhat version evidence

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Other versions: affected

Product identifiers (CPE)

cpe:/a:redhat:openshift:5

Red Hat · redhat

Red Hat OpenShift Container Platform 5

0 ranges

redhat version evidence

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Other versions: affected

Product identifiers (CPE)

cpe:/a:redhat:openshift:5

Red Hat · redhat

Red Hat OpenStack Platform 13 (Queens)

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redhat version evidence

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Other versions: affected

Product identifiers (CPE)

cpe:/a:redhat:openstack:13

Red Hat · redhat

Red Hat OpenStack Platform 18.0

0 ranges

redhat version evidence

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Other versions: affected

Product identifiers (CPE)

cpe:/a:redhat:openstack:18.0

Original 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.

Inside the record

Evidence available

Package identity · not supplied

Version evidence · not supplied

Remediation guidance

Weakness classification

Additional publishers · not supplied

Describes the evidence in this view, not whether the product is safe.

Original records

CVE-2026-93008

View the latest unmodified CVE JSON from the official source. It may be newer than this imported page.

cve.new JSON →

Underlying weaknesses

The source’s classification of what caused the vulnerability.

CWE-345 ↗

Insufficient Verification of Data Authenticity

redhat

Contributing organizations · 1

redhat

Assigning organization

2026-10-30

What changed

Follow changes

CVE · CVE-2026-930082026-10-30

Observed 2026-10-30T02:47:30.783Z · upstream updated 2026-10-30T00:23:28.723Z

Product or version evidence changed

before

[
  {
    "vendor": "Red Hat",
    "name": "Red Hat Ceph Storage 9",
    "platforms": [],
    "versions": [],
    "defaultStatus": "affected",
    "cpes": [
      "cpe:/a:redhat:ceph_storage:9"
    ],
    "source": "redhat",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-93008"
  },
  {
    "vendor": "Red Hat",
    "name": "Red Hat Enterprise Linux 10",
    "platforms": [],
    "versions": [],
    "defaultStatus": "affected",
    "cpes": [
      "cpe:/o:redhat:enterprise_linux:10"
    ],
    "source": "redhat",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-93008"
  },
  {
    "vendor": "Red Hat",
    "name": "Red Hat Enterprise Linux 6",
    "platforms": [],
    "versions": [],
    "defaultStatus": "affected",
    "cpes": [
      "cpe:/o:redhat:enterprise_linux:6"
    ],
    "source": "redhat",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-93008"
  },
  {
    "vendor": "Red Hat",
    "name": "Red Hat Enterprise Linux 7",
    "platforms": [],
    "versions": [],
    "defaultStatus": "affected",
    "cpes": [
      "cpe:/o:redhat:enterprise_linux:7"
    ],
    "source": "redhat",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-93008"
  },
  {
    "vendor": "Red Hat",
    "name": "Red Hat Enterprise Linux 8",
    "platforms": [],
    "versions": [],
    "defaultStatus": "affected",
    "cpes": [
      "cpe:/o:redhat:enterprise_linux:8"
    ],
    "source": "redhat",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-93008"
  },
  {
    "vendor": "Red Hat",
    "name": "Red Hat Enterprise Linux 9",
    "platforms": [],
    "versions": [],
    "defaultStatus": "affected",
    "cpes": [
      "cpe:/o:redhat:enterprise_linux:9"
    ],
    "source": "redhat",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-93008"
  },
  {
    "vendor": "Red Hat",
    "name": "Red Hat OpenShift Container Platform 4",
    "platforms": [],
    "versions": [],
    "defaultStatus": "affected",
    "cpes": [
      "cpe:/a:redhat:openshift:4"
    ],
    "source": "redhat",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-93008"
  },
  {
    "vendor": "Red Hat",
    "name": "Red Hat OpenShift Container Platform 4",
    "platforms": [],
    "versions": [],
    "defaultStatus": "affected",
    "cpes": [
      "cpe:/a:redhat:openshift:4"
    ],
    "source": "redhat",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-93008"
  },
  {
    "vendor": "Red Hat",
    "name": "Red Hat OpenShift Container Platform 4",
    "platforms": [],
    "versions": [],
    "defaultStatus": "affected",
    "cpes": [
      "cpe:/a:redhat:openshift:4"
    ],
    "source": "redhat",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-93008"
  },
  {
    "vendor": "Red Hat",
    "name": "Red Hat OpenShift Container Platform 4",
    "platforms": [],
    "versions": [],
    "defaultStatus": "affected",
    "cpes": [
      "cpe:/a:redhat:openshift:4"
    ],
    "source": "redhat",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-93008"
  },
  {
    "vendor": "Red Hat",
    "name": "Red Hat OpenStack Platform 13 (Queens)",
    "platforms": [],
    "versions": [],
    "defaultStatus": "affected",
    "cpes": [
      "cpe:/a:redhat:openstack:13"
    ],
    "source": "redhat",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-93008"
  },
  {
    "vendor": "Red Hat",
    "name": "Red Hat OpenStack Platform 18.0",
    "platforms": [],
    "versions": [],
    "defaultStatus": "affected",
    "cpes": [
      "cpe:/a:redhat:openstack:18.0"
    ],
    "source": "redhat",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-93008"
  }
]

after

[
  {
    "vendor": "Red Hat",
    "name": "Red Hat Ceph Storage 9",
    "platforms": [],
    "versions": [],
    "defaultStatus": "affected",
    "cpes": [
      "cpe:/a:redhat:ceph_storage:9"
    ],
    "source": "redhat",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-93008"
  },
  {
    "vendor": "Red Hat",
    "name": "Red Hat Enterprise Linux 10",
    "platforms": [],
    "versions": [],
    "defaultStatus": "affected",
    "cpes": [
      "cpe:/o:redhat:enterprise_linux:10"
    ],
    "source": "redhat",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-93008"
  },
  {
    "vendor": "Red Hat",
    "name": "Red Hat Enterprise Linux 6",
    "platforms": [],
    "versions": [],
    "defaultStatus": "affected",
    "cpes": [
      "cpe:/o:redhat:enterprise_linux:6"
    ],
    "source": "redhat",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-93008"
  },
  {
    "vendor": "Red Hat",
    "name": "Red Hat Enterprise Linux 7",
    "platforms": [],
    "versions": [],
    "defaultStatus": "affected",
    "cpes": [
      "cpe:/o:redhat:enterprise_linux:7"
    ],
    "source": "redhat",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-93008"
  },
  {
    "vendor": "Red Hat",
    "name": "Red Hat Enterprise Linux 8",
    "platforms": [],
    "versions": [],
    "defaultStatus": "affected",
    "cpes": [
      "cpe:/o:redhat:enterprise_linux:8"
    ],
    "source": "redhat",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-93008"
  },
  {
    "vendor": "Red Hat",
    "name": "Red Hat Enterprise Linux 9",
    "platforms": [],
    "versions": [],
    "defaultStatus": "affected",
    "cpes": [
      "cpe:/o:redhat:enterprise_linux:9"
    ],
    "source": "redhat",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-93008"
  },
  {
    "vendor": "Red Hat",
    "name": "Red Hat OpenShift Container Platform 4",
    "platforms": [],
    "versions": [],
    "defaultStatus": "affected",
    "cpes": [
      "cpe:/a:redhat:openshift:4"
    ],
    "source": "redhat",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-93008"
  },
  {
    "vendor": "Red Hat",
    "name": "Red Hat OpenShift Container Platform 4",
    "platforms": [],
    "versions": [],
    "defaultStatus": "affected",
    "cpes": [
      "cpe:/a:redhat:openshift:4"
    ],
    "source": "redhat",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-93008"
  },
  {
    "vendor": "Red Hat",
    "name": "Red Hat OpenShift Container Platform 4",
    "platforms": [],
    "versions": [],
    "defaultStatus": "affected",
    "cpes": [
      "cpe:/a:redhat:openshift:4"
    ],
    "source": "redhat",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-93008"
  },
  {
    "vendor": "Red Hat",
    "name": "Red Hat OpenShift Container Platform 4",
    "platforms": [],
    "versions": [],
    "defaultStatus": "affected",
    "cpes": [
      "cpe:/a:redhat:openshift:4"
    ],
    "source": "redhat",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-93008"
  },
  {
    "vendor": "Red Hat",
    "name": "Red Hat OpenShift Container Platform 5",
    "platforms": [],
    "versions": [],
    "defaultStatus": "affected",
    "cpes": [
      "cpe:/a:redhat:openshift:5"
    ],
    "source": "redhat",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-93008"
  },
  {
    "vendor": "Red Hat",
    "name": "Red Hat OpenShift Container Platform 5",
    "platforms": [],
    "versions": [],
    "defaultStatus": "affected",
    "cpes": [
      "cpe:/a:redhat:openshift:5"
    ],
    "source": "redhat",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-93008"
  },
  {
    "vendor": "Red Hat",
    "name": "Red Hat OpenStack Platform 13 (Queens)",
    "platforms": [],
    "versions": [],
    "defaultStatus": "affected",
    "cpes": [
      "cpe:/a:redhat:openstack:13"
    ],
    "source": "redhat",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-93008"
  },
  {
    "vendor": "Red Hat",
    "name": "Red Hat OpenStack Platform 18.0",
    "platforms": [],
    "versions": [],
    "defaultStatus": "affected",
    "cpes": [
      "cpe:/a:redhat:openstack:18.0"
    ],
    "source": "redhat",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-93008"
  }
]

Large field values are marked as truncated previews. Original source snapshots remain retained.

Showing up to 50 most recent observed changes.

References

2 sources

access.redhat.com/security/cve/CVE-2026-93008

vdb-entryredhat

bugzilla.redhat.com/show_bug.cgi

issue-trackingredhat

Priority and evidence

Not in CISA KEVNo package fix recorded

KEV coverage does not rule out exploitation.

KEV checked 30/10/2026, 23:40:32 UTC

redhat · CVSS:3.1 · 6.8

Assessment vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N

Reading the signals

Severity · CVSS: Technical impact and attack conditions. The headline is the highest imported catalog score; sources may disagree.
Observed exploitation · KEV: An absent or unavailable KEV listing does not establish that exploitation has not occurred.
Predicted exploitation · EPSS: No EPSS estimate available in this record.

Record details

Published: 29/10/2026, 12:33:22 UTC
Modified: 30/10/2026, 00:23:28 UTC
Last imported by cve.new: 30/10/2026, 02:47:30 UTC
Aliases: None recorded

Source evidence

Request a correction or dispute

Start with the assigning organization for this record. Include the CVE ID, the disputed information, and supporting evidence. A dispute does not itself reject a record.

Find the responsible CNA →Official dispute and escalation process ↗

CVE CVE-2026-93008

Enrichment coverage

NVDNo result

Checked 29/10/2026, 12:45:40 UTC

GHSANo result

Checked 29/10/2026, 12:45:38 UTC

EUVDRefresh failed

Previous evidence retained where available.

EPSSNo result

Checked 29/10/2026, 12:45:38 UTC

Sponsored by MoxsoBuild security habits with adaptive training and phishing simulations.View as JSON

Dnsmasq: dnsmasq: out-of-bailiwick cache injection through cname chase in split-dns configurations

Impact

What to do

Affected packages

Affected products

Red Hat Ceph Storage 9

affected

unaffected

unknown

Red Hat Enterprise Linux 10

affected

unaffected

unknown

Red Hat Enterprise Linux 6

affected

unaffected

unknown

Red Hat Enterprise Linux 7

affected

unaffected

unknown

Red Hat Enterprise Linux 8

affected

unaffected

unknown

Red Hat Enterprise Linux 9

affected

unaffected

unknown

Red Hat OpenShift Container Platform 4

affected

unaffected

unknown

Red Hat OpenShift Container Platform 4

affected

unaffected

unknown

Red Hat OpenShift Container Platform 4

affected

unaffected

unknown

Red Hat OpenShift Container Platform 4

affected

unaffected

unknown

Red Hat OpenShift Container Platform 5

affected

unaffected

unknown

Red Hat OpenShift Container Platform 5

affected

unaffected

unknown

Red Hat OpenStack Platform 13 (Queens)

affected

unaffected

unknown

Red Hat OpenStack Platform 18.0

affected

unaffected

unknown

Original source description

Inside the record

Evidence available

Original records

Underlying weaknesses

What changed

References