DEBIAN-CVE-2026-93009

See a problem?
Please try reporting it to the source first.
Source
https://security-tracker.debian.org/tracker/CVE-2026-93009
Import Source
https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-93009.json
JSON Data
https://api.osv.dev/v1/vulns/DEBIAN-CVE-2026-93009
Upstream
  • CVE-2026-93009
Published
2026-10-29T14:18:00Z
Modified
2026-10-30T05:00:08Z
Severity
  • 4.3 (Medium) CVSS_V3 - CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N CVSS Calculator
Summary
[none]
Details

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.

References

Affected packages

Debian:12 / dnsmasq

Package

Name
dnsmasq
Purl
pkg:deb/debian/dnsmasq?arch=source&distro=bookworm

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.89-1
2.90-1
2.90-2
2.90-3
2.90-4~deb12u1
2.90-4~deb12u2
2.90-4
2.90-5
2.90-6
2.90-7
2.91~test6-1
2.91~test9-1
2.91-1
2.92~rc1-1
2.92~rc3-1
2.92-1~exp1
2.92-1
2.92-1+exp1
2.92-2
2.92-3
2.92-4
2.92-5
2.93-1
2.93-2
2.93-3

Ecosystem specific 

{
    "urgency":  "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-93009.json"

Debian:13 / dnsmasq

Package

Name
dnsmasq
Purl
pkg:deb/debian/dnsmasq?arch=source&distro=trixie

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.91-1
2.91-1+deb13u1
2.91-1+deb13u2
2.92~rc1-1
2.92~rc3-1
2.92-1~exp1
2.92-1
2.92-1+exp1
2.92-2
2.92-3
2.92-4
2.92-5
2.93-1
2.93-2
2.93-3

Ecosystem specific 

{
    "urgency":  "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-93009.json"

Debian:14 / dnsmasq

Package

Name
dnsmasq
Purl
pkg:deb/debian/dnsmasq?arch=source&distro=forky

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.91-1
2.92~rc1-1
2.92~rc3-1
2.92-1~exp1
2.92-1
2.92-1+exp1
2.92-2
2.92-3
2.92-4
2.92-5
2.93-1
2.93-2
2.93-3

Ecosystem specific 

{
    "urgency":  "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-93009.json"