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CVE-2026-93006

Dnsmasq: dnsmasq: tftp prefetch cache keyed on stale heap pointer serves wrong file content

6.8 Medium

A flaw was found in dnsmasq. The TFTP server can serve the wrong file contents because a recently used transfer cache is not invalidated when a transfer finishes. An attacker on the local network who can request a TFTP file may cause a later client to receive previously cached data instead of the requested file. In PXE network-boot environments this can substitute attacker-chosen boot content for a victim machine.

Attack profile

How easy it is to exploit

Attack vector
Adjacent network
Complexity
High
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
High
Availability
None

Exploit likelihood

0.30%Unchanged since Oct 30, 2026
90%50%10%1%

What each source reports

CVE List Score used 6.8

Dnsmasq: dnsmasq: tftp prefetch cache keyed on stale heap pointer serves wrong file content

A flaw was found in dnsmasq. The TFTP server can serve the wrong file contents because a recently used transfer cache is not invalidated when a transfer finishes. An attacker on the local network who can request a TFTP file may cause a later client to receive previously cached data instead of the requested file. In PXE network-boot environments this can substitute attacker-chosen boot content for a victim machine.

Record
CVE-2026-93006
CVSS 3.1
6.8 MediumCVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Weakness
CWE-672
Updated
2026-11-06
EUVDEUVD-2026-112791 6.8

A flaw was found in dnsmasq. The TFTP server can serve the wrong file contents because a recently used transfer cache is not invalidated when a transfer finishes. An attacker on the local network who can request a TFTP file may cause a later client to receive previously cached data instead of the requested file. In PXE network-boot environments this can substitute attacker-chosen boot content for a victim machine.

Record
EUVD-2026-112791
CVSS 3.1
6.8 MediumCVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Updated
2026-11-06
GitHub AdvisoriesGHSA-fp59-6rfj-9jgw 6.8

A flaw was found in dnsmasq. The TFTP server can serve the wrong file contents because a recently...

A flaw was found in dnsmasq. The TFTP server can serve the wrong file contents because a recently used transfer cache is not invalidated when a transfer finishes. An attacker on the local network who can request a TFTP file may cause a later client to receive previously cached data instead of the requested file. In PXE network-boot environments this can substitute attacker-chosen boot content for a victim machine.

Record
GHSA-fp59-6rfj-9jgw
CVSS 3.1
6.8 MediumCVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Weakness
CWE-672
Updated
2026-11-02
NVD 6.8

A flaw was found in dnsmasq. The TFTP server can serve the wrong file contents because a recently used transfer cache is not invalidated when a transfer finishes. An attacker on the local network who can request a TFTP file may cause a later client to receive previously cached data instead of the requested file. In PXE network-boot environments this can substitute attacker-chosen boot content for a victim machine.

Record
CVE-2026-93006
CVSS 3.1
6.8 MediumCVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Weakness
CWE-672
Updated
2026-11-06
OSVDEBIAN-CVE-2026-93006 6.8

A flaw was found in dnsmasq. The TFTP server can serve the wrong file contents because a recently used transfer cache is not invalidated when a transfer finishes. An attacker on the local network who can request a TFTP file may cause a later client to receive previously cached data instead of the requested file. In PXE network-boot environments this can substitute attacker-chosen boot content for a victim machine.

Record
DEBIAN-CVE-2026-93006
CVSS 3.1
6.8 MediumCVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Updated
2026-11-07
OSVUBUNTU-CVE-2026-93006 6.8

A flaw was found in dnsmasq. The TFTP server can serve the wrong file contents because a recently used transfer cache is not invalidated when a transfer finishes. An attacker on the local network who can request a TFTP file may cause a later client to receive previously cached data instead of the requested file. In PXE network-boot environments this can substitute attacker-chosen boot content for a victim machine.

Record
UBUNTU-CVE-2026-93006
CVSS 3.1
6.8 MediumCVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Updated
2026-11-05
OSVAZL-112415 No score

CVE-2026-93006 affecting package dnsmasq 2.93-1

A flaw was found in dnsmasq. The TFTP server can serve the wrong file contents because a recently used transfer cache is not invalidated when a transfer finishes. An attacker on the local network who can request a TFTP file may cause a later client to receive previously cached data instead of the requested file. In PXE network-boot environments this can substitute attacker-chosen boot content for a victim machine.

Record
AZL-112415
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

Affected packages
PackageAffectedFixed
dnsmasq
Azure Linux:3
through 2.93-1 None known
dnsmasq
Debian:12
All versions, plus listed versions
2.89-12.90-12.90-22.90-32.90-4
Show 20 moreShow less
2.90-4~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
dnsmasq
Debian:14
All versions, plus listed versions
2.91-12.92-12.92-1+exp12.92-1~exp12.92-2
Show 8 moreShow less
2.92-32.92-42.92-52.92~rc1-12.92~rc3-12.93-12.93-22.93-3
None known
dnsmasq
Ubuntu: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 less
2.68-1ubuntu0.2+esm12.68-1ubuntu0.2+esm22.68-1ubuntu0.2+esm32.68-1ubuntu0.2+esm52.68-1ubuntu0.2+esm6
None known
dnsmasq
Ubuntu: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 less
2.75-1ubuntu0.16.04.52.75-1ubuntu0.16.04.72.75-1ubuntu0.16.04.82.75-1ubuntu0.16.04.102.75-1ubuntu0.16.04.10+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
dnsmasq
Ubuntu: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 less
2.79-1ubuntu0.42.79-1ubuntu0.52.79-1ubuntu0.62.79-1ubuntu0.72.90-0ubuntu0.18.04.1+esm12.90-0ubuntu0.18.04.1+esm32.90-0ubuntu0.18.04.1+esm4
None known
dnsmasq
Ubuntu: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 less
2.80-1.1ubuntu1.42.80-1.1ubuntu1.52.80-1.1ubuntu1.62.80-1.1ubuntu1.72.90-0ubuntu0.20.04.12.90-0ubuntu0.20.04.1+esm22.90-0ubuntu0.20.04.1+esm3
None known
dnsmasq
Ubuntu: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 less
2.86-1.1ubuntu0.42.86-1.1ubuntu0.52.90-0ubuntu0.22.04.12.90-0ubuntu0.22.04.32.90-0ubuntu0.22.04.42.91-0ubuntu0.22.04.12.91-0ubuntu0.22.04.2
None known
dnsmasq
Ubuntu:24.04:LTS
All versions, plus listed versions
2.89-12.90-22.90-2build12.90-2build22.90-2ubuntu0.1
Show 4 moreShow less
2.90-2ubuntu0.32.90-2ubuntu0.42.91-0ubuntu0.24.04.12.91-0ubuntu0.24.04.2
None known
dnsmasq
Ubuntu:26.10
All versions, plus listed versions
2.92-12.93-12.93-3ubuntu1
None known
dnsmasq
Ubuntu: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
dnsmasq
openSUSE:Tumbleweed
From an advisory covering 5 CVEs
before 2.93-3.1
2.93-3.1

History

History
RecordedChangedSources
affectedOSV
affected, factsCVE List, EUVD, NVD
affected, aliases, facts, referencesOSV
factsCVE List, EUVD, NVD, OSV
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-93006 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 0.30%, the 23rd percentile. No source names a fixed version.

References

Show 6 moreShow less
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