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CVE-2026-93008

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

CVSS score

6.8

EPSS probability

—

Risk score

0.7

Published

1 h ago

OverviewPublic Exploits (0)NewsroomVulnerability Timeline
Patch status has not yet been verified

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Vulnerability description

DayBreach AI Explanation

Verified against sources

CVE-2026-93008: Dnsmasq Out-of-Bailiwick Cache Injection Vulnerability in Split-DNS

Sources read

1

Source agreement

Tam uyum

Evidence confidence

%55

Short explanation

A flaw exists in Dnsmasq allowing out-of-bailiwick cache injection through CNAME chase in split-DNS configurations.

Why does it matter?

Attackers controlling an upstream server can inject cache entries for unrelated names, causing subsequent clients to receive attacker-chosen addresses.

What should be done?

  • Follow vendor advisory guidance
  • Review split-DNS configurations
Chain of evidence and sources2 verified claims

Dnsmasq, bir DNS yanıtındaki CNAME kaydını takip ederken hedef kayıtların yetkili bölgeye ait olup olmadığını kontrol etmeden önbelleğe alabilir.

S0 · daybreach-canonicalS1 · cvelist

Bölünmüş DNS dağıtımlarında üst akışı kontrol eden bir saldırgan, ilişkisiz adlar için önbellek girdileri enjekte edebilir.

S0 · daybreach-canonicalS1 · cvelist
Show the technical text from the sources

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.

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

CWE: CWE-345

This explanation was compiled automatically from the source records. Scores, active exploitation, patch and exploit status come straight from the sources.

IMPACT: Affected Products and Software

Affected Products

The following products are affected by CVE-2026-93008 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.

IDVENDORPRODUCTACTION
1Red HatRed Hat Ceph Storage 9 View
2Red HatRed Hat Enterprise Linux 10 View
3Red HatRed Hat Enterprise Linux 6 View
4Red HatRed Hat Enterprise Linux 7 View
5Red HatRed Hat Enterprise Linux 8 View
6Red HatRed Hat Enterprise Linux 9 View
7Red HatRed Hat OpenShift Container Platform 4 View
8Red HatRed Hat OpenStack Platform 13 (Queens) View
9Red HatRed Hat OpenStack Platform 18.0 View
Total affected vendors: 1|Products: 9

RED HAT CSAF/VEX: Product Impact Check

Red Hat has not yet published a CSAF/VEX impact record for this CVE. This does not mean “not affected”.

SCORING: CVSS from Multiple Sources

CVSS Scores

The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.

SCOREVERSIONSEVERITYVECTORSOURCE
6.8CVSS V3_1MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:NCVE CNA
6.8CVSS V31MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:NNVD

Patch and Remediation Guide

Solution & Remediation Advisory

Patch status unknown

İncelenen resmî kaynaklarda yama durumu doğrulanamadı. Bu sonuç “yama yok” anlamına gelmez.

Confirm the affected product and version against the source evidence above.
Restrict access to internet-facing services and apply network segmentation.
Until a patch is confirmed, follow the vendor advisory; do not read an unknown status as “no patch”.
Monitor server logs and network endpoints for signs of anomalous execution.

Public exploit and active exploitation status

Verified exploit intelligence

No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.

Weakness Classification and Attack Patterns (CWE & CAPEC)

CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-93008 is associated with the following CWEs:

CWE-345: Common Weakness Enumeration Entry CWE-345

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-93008 weaknesses.

CAPEC-66: SQL InjectionCAPEC-126: Path TraversalCAPEC-28: OS Command Injection

Attack Vector and Accessibility

ExposureAğ üzerinden
PermissionsGerekmiyor
UserGerekmiyor

Official Sources and Advisories

https://access.redhat.com/security/cve/CVE-2026-93008vendor-advisoryRHBZ#2536079vendor-advisory

CVSS Vector Radar Chart

6.8 / 10
Attack VectorNetworkComplexityHighPrivilegesNoneUser Interact.NoneConfidentialityHighIntegrityNoneAvailabilityNone

Vulnerability Scoring Details

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N
Attack VectorNetwork
Attack ComplexityHigh
Privileges RequiredNone required
User InteractionNone required
Confidentiality (Gizlilik)High
Integrity (Bütünlük)None
Availability (Erişilebilirlik)None

Yama durumu bilinmiyor

İncelenen resmî kaynaklarda yama durumu doğrulanamadı. Bu sonuç “yama yok” anlamına gelmez.

Follow the vendor

RH
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Red Hat

Weakness Type (CWE & CAPEC)

CWE-345

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CVE-2026-93008 · Dnsmasq: dnsmasq: out-of-bailiwick cache…