DEBIAN-CVE-2026-56114

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Source
https://security-tracker.debian.org/tracker/CVE-2026-56114
Import Source
https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-56114.json
JSON Data
https://api.osv.dev/v1/vulns/DEBIAN-CVE-2026-56114
Upstream
Published
2026-06-23T17:17:09Z
Modified
2026-09-14T17:03:46Z
Severity
  • 6.5 (Medium) CVSS_V3 - CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
[none]
Details

dhcpcd through 10.3.2, fixed in commit 2f00c7b, contains a one-byte stack out-of-bounds write vulnerability in dhcp6_makemessage() in src/dhcp6.c that allows unauthenticated same-link attackers to write beyond a fixed local buffer by serializing an oversized RFC6603 OPTION_PD_EXCLUDE option body. Attackers can send a crafted DHCPv6 ADVERTISE message containing an IA_PD IAPREFIX /0 with a valid OPTION_PD_EXCLUDE using an exclude prefix length of /121 through /128 to trigger the out-of-bounds write and potentially corrupt adjacent stack memory.

References

Affected packages

Debian:13 / dhcpcd

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
1:10.1.0-11+deb13u3

Affected versions

1:10.*
1:10.1.0-11
1:10.1.0-11+deb13u1
1:10.1.0-11+deb13u2

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-56114.json"

Debian:14 / dhcpcd

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
1:10.3.2-4

Affected versions

1:10.*
1:10.1.0-11
1:10.1.0-12
1:10.2.0-1
1:10.2.2-1
1:10.2.2-2
1:10.2.2-3
1:10.2.2-4
1:10.2.2-5
1:10.2.2-6
1:10.2.3-1
1:10.2.4-1
1:10.2.4-2
1:10.2.4-3
1:10.2.4-4~bpo13+1
1:10.2.4-4
1:10.3.0-1
1:10.3.0-2~bpo13+1
1:10.3.0-2
1:10.3.0-3~bpo13+1
1:10.3.0-3
1:10.3.0-4
1:10.3.0-5
1:10.3.0-6
1:10.3.0-7~bpo13+1
1:10.3.0-7
1:10.3.1-1~bpo13+1
1:10.3.1-1
1:10.3.1-2
1:10.3.1-3
1:10.3.1-4
1:10.3.1-5~bpo13+1
1:10.3.1-5
1:10.3.2-1
1:10.3.2-2
1:10.3.2-3~bpo13+1
1:10.3.2-3
1:10.3.2-4~bpo13+1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-56114.json"

Debian:12 / dhcpcd5

Package

Name
dhcpcd5
Purl
pkg:deb/debian/dhcpcd5?arch=source&distro=bookworm

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
9.4.1-24~deb12u5

Affected versions

9.*
9.4.1-22
9.4.1-23
9.4.1-24~deb12u1
9.4.1-24~deb12u2
9.4.1-24~deb12u3
9.4.1-24~deb12u4

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-56114.json"