CVE-2026-56114: dhcpcd through 10.3.2, fixed in commit 2f00c7b, contains a one-byte stack out-of-bounds write vulnerability in

Q: How do I fix CVE-2026-56114?

dhcpcd: upgrade to newer than 10.3.2. Exact commands for each OS are on this page.

Q: Is CVE-2026-56114 being exploited?

CVE-2026-56114 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-56114 affect?

CVE-2026-56114 affects dhcpcd. Severity is medium (CVSS 5.3). 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 serial

Q: How urgent is CVE-2026-56114?

Priority 23/100. No elevated risk signals yet.

Routine

MEDIUM 5.3UPGRADE

CVE-2026-56114 is a medium-severity flaw (CVSS 5.3) affecting dhcpcd. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 /

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Adjacent network
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 81%)
CISA exploited list	No
Weakness	CWE-787
Published	2026-06-23
Last modified	2026-10-25

Publisher (CNA): VulnCheck · Vendor: dhcpcd project

Last updated 2026-10-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-23 17:17 UTCPublished CVE record published
2026-10-25 23:10 UTCUpdated Record last modified

dhcpcd project dhcpcd UPGRADE

Affected: <= 10.3.2

Fixed in: newer than 10.3.2

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy dhcpcd || rpm -q dhcpcd || dhcpcd --version

2. UPGRADE to newer than 10.3.2 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade dhcpcd

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade dhcpcd

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-56114?

dhcpcd: upgrade to newer than 10.3.2. Exact commands for each OS are on this page.

Is CVE-2026-56114 being exploited?

CVE-2026-56114 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-56114 affect?

CVE-2026-56114 affects dhcpcd. Severity is medium (CVSS 5.3). 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 serial

How urgent is CVE-2026-56114?

Priority 23/100. No elevated risk signals yet.

Related CVEs

CVE-2026-56116 MEDIUM 6.5 UPGRADE dhcpcd through 10.3.2, fixed in commit 708b4a5, contains a memory leak vulnerability in the IPv6 Router Advert
CVE-2026-56113 MEDIUM 5.3 UPGRADE dhcpcd through 10.3.2, fixed in commit 5733d3c, contains a heap use-after-free vulnerability that allows unaut
CVE-2026-56117 MEDIUM 4.7 UPGRADE dhcpcd through 10.3.2, fixed in commit 78ea09e, contains a heap use-after-free vulnerability in the control so

References

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