CVE-2026-93008
Dnsmasq: dnsmasq: out-of-bailiwick cache injection through cname chase in split-dns configurations
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- High
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- High
- Availability
- None
Exploit likelihood
What each source reports
CVE List Score used
Dnsmasq: dnsmasq: out-of-bailiwick cache injection through cname chase in split-dns configurations
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.
- Record
CVE-2026-93008- CVSS 3.1
- 6.8 Medium
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N - Weakness
- CWE-345
- Updated
- 2026-11-03
EUVDEUVD-2026-112787
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.
- Record
EUVD-2026-112787- CVSS 3.1
- 6.8 Medium
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N - Updated
- 2026-11-05
GitHub AdvisoriesGHSA-wpph-r7r5-526c
A flaw was found in dnsmasq. When following a CNAME in a DNS response, the resolver can cache...
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.
- Record
GHSA-wpph-r7r5-526c- CVSS 3.1
- 6.8 Medium
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N - Weakness
- CWE-345
- Updated
- 2026-11-02
NVD
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.
- Record
CVE-2026-93008- CVSS 3.1
- 6.8 Medium
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N - Weakness
- CWE-345
- Updated
- 2026-11-05
OSVDEBIAN-CVE-2026-93008
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.
- Record
DEBIAN-CVE-2026-93008- CVSS 3.1
- 6.8 Medium
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N - Updated
- 2026-11-05
OSVUBUNTU-CVE-2026-93008
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.
- Record
UBUNTU-CVE-2026-93008- CVSS 3.1
- 6.8 Medium
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N - Updated
- 2026-11-05
OSVAZL-112424 No score
CVE-2026-93008 affecting package dnsmasq 2.93-1
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.
- Record
AZL-112424- Updated
- 2026-11-05
OSVopenSUSE-SU-2026:12415-1 No score
dnsmasq-2.93-3.1 on GA media
These are all security issues fixed in the dnsmasq-2.93-3.1 package on the GA media of openSUSE Tumbleweed.
- Record
openSUSE-SU-2026:12415-1- Updated
- 2026-11-05
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
dnsmasqAzure Linux:3 |
through 2.93-1 | None known |
dnsmasqDebian:12 |
All versions, plus listed versions 2.89-12.90-12.90-22.90-32.90-4 Show 20 moreShow less2.90-4~deb12u12.90-4~deb12u22.90-52.90-62.90-72.91-12.91~test6-12.91~test9-12.92-12.92-1+exp12.92-1~exp12.92-22.92-32.92-42.92-52.92~rc1-12.92~rc3-12.93-12.93-22.93-3 |
None known |
dnsmasqDebian:13 |
All versions, plus listed versions 2.91-12.91-1+deb13u12.91-1+deb13u22.92-12.92-1+exp1 Show 10 moreShow less2.92-1~exp12.92-22.92-32.92-42.92-52.92~rc1-12.92~rc3-12.93-12.93-22.93-3 |
None known |
dnsmasqDebian:14 |
All versions, plus listed versions 2.91-12.92-12.92-1+exp12.92-1~exp12.92-2 Show 8 moreShow less2.92-32.92-42.92-52.92~rc1-12.92~rc3-12.93-12.93-22.93-3 |
None known |
dnsmasqUbuntu:Pro:14.04:LTS |
All versions, plus listed versions 2.66-4ubuntu12.67-12.68-12.68-1ubuntu0.12.68-1ubuntu0.2 Show 5 moreShow less2.68-1ubuntu0.2+esm12.68-1ubuntu0.2+esm22.68-1ubuntu0.2+esm32.68-1ubuntu0.2+esm52.68-1ubuntu0.2+esm6 |
None known |
dnsmasqUbuntu:Pro:16.04:LTS |
All versions, plus listed versions 2.75-12.75-1ubuntu0.16.04.12.75-1ubuntu0.16.04.22.75-1ubuntu0.16.04.32.75-1ubuntu0.16.04.4 Show 10 moreShow less2.75-1ubuntu0.16.04.52.75-1ubuntu0.16.04.72.75-1ubuntu0.16.04.82.75-1ubuntu0.16.04.102.75-1ubuntu0.16.04.10+esm12.79-1ubuntu0.16.04.1+esm12.79-1ubuntu0.16.04.1+esm22.90-0ubuntu0.16.04.1+esm12.90-0ubuntu0.16.04.1+esm32.90-0ubuntu0.16.04.1+esm4 |
None known |
dnsmasqUbuntu:Pro:18.04:LTS |
All versions, plus listed versions 2.78-12.78-32.79-12.79-1ubuntu0.22.79-1ubuntu0.3 Show 7 moreShow less2.79-1ubuntu0.42.79-1ubuntu0.52.79-1ubuntu0.62.79-1ubuntu0.72.90-0ubuntu0.18.04.1+esm12.90-0ubuntu0.18.04.1+esm32.90-0ubuntu0.18.04.1+esm4 |
None known |
dnsmasqUbuntu:Pro:20.04:LTS |
All versions, plus listed versions 2.80-1ubuntu22.80-1ubuntu42.80-1.1ubuntu12.80-1.1ubuntu1.22.80-1.1ubuntu1.3 Show 7 moreShow less2.80-1.1ubuntu1.42.80-1.1ubuntu1.52.80-1.1ubuntu1.62.80-1.1ubuntu1.72.90-0ubuntu0.20.04.12.90-0ubuntu0.20.04.1+esm22.90-0ubuntu0.20.04.1+esm3 |
None known |
dnsmasqUbuntu:22.04:LTS |
All versions, plus listed versions 2.85-1ubuntu22.86-1.12.86-1.1ubuntu0.12.86-1.1ubuntu0.22.86-1.1ubuntu0.3 Show 7 moreShow less2.86-1.1ubuntu0.42.86-1.1ubuntu0.52.90-0ubuntu0.22.04.12.90-0ubuntu0.22.04.32.90-0ubuntu0.22.04.42.91-0ubuntu0.22.04.12.91-0ubuntu0.22.04.2 |
None known |
dnsmasqUbuntu:24.04:LTS |
All versions, plus listed versions 2.89-12.90-22.90-2build12.90-2build22.90-2ubuntu0.1 Show 4 moreShow less2.90-2ubuntu0.32.90-2ubuntu0.42.91-0ubuntu0.24.04.12.91-0ubuntu0.24.04.2 |
None known |
dnsmasqUbuntu:26.10 |
All versions, plus listed versions 2.92-12.93-12.93-3ubuntu1 |
None known |
dnsmasqUbuntu:26.04:LTS |
All versions, plus listed versions 2.91-1build12.92~rc3-12.92-12.92-1ubuntu0.22.92-1ubuntu0.32.92-1ubuntu0.42.92-1ubuntu0.5 |
None known |
dnsmasqopenSUSE:Tumbleweed From an advisory covering 5 CVEs |
before 2.93-3.1 | 2.93-3.1 |
History
| Recorded | Changed | Sources |
|---|---|---|
| affected, facts | ||
| affected, aliases, facts, references | EUVD, NVD, OSV | |
| facts | CVE List, EUVD | |
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-93008 is a medium vulnerability (CVSS 6.8) in Red Hat Ceph Storage 9, published October 29, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.15%, the 4th percentile. No source names a fixed version.