How severe is CVE-2026-56117?

CVE-2026-56117 has a CVSS 3.x base score of 4.7, rated medium severity. It is exploitable over local access with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-56117 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (1st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-56117?

CVE-2026-56117 affects Dhcpcd Project Dhcpcd. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-56117?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-56117 have an EU (EUVD) identifier?

Yes. CVE-2026-56117 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-38498.

When was CVE-2026-56117 published?

CVE-2026-56117 was published on 2026-06-23 and last updated on 2026-06-28.

CVE-2026-56117

CVE-2026-56117 is a medium-severity vulnerability in Dhcpcd Project Dhcpcd with a CVSS 3.x base score of 4.7. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-416.

Key facts

Severity: Medium (CVSS 3.x base score 4.7)
CVSS v4: 5.7
EPSS exploit prediction: 0% (1st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-38498
Weakness: CWE-416
Affected product: Dhcpcd Project Dhcpcd
Published: 2026-06-23
Last modified: 2026-06-28

Description

dhcpcd through 10.3.2, fixed in commit 78ea09e, contains a heap use-after-free vulnerability in the control socket handling within src/control.c that allows local unprivileged attackers to trigger memory corruption when privilege separation is disabled. Attackers can connect to the control socket and send a privileged command such as -x, causing control_recvdata() to free the client object while the same READ+HANGUP event subsequently reaches control_hangup() with the stale pointer, resulting in a use-after-free condition exploitable in deployments using --disable-privsep or where privsep initialization has failed with the control socket operating in mode 0666.

Frequently asked questions

What is CVE-2026-56117?: dhcpcd through 10.3.2, fixed in commit 78ea09e, contains a heap use-after-free vulnerability in the control socket handling within src/control.c that allows local unprivileged attackers to trigger memory corruption when privilege separation is disabled. Attackers can connect to the control socket and send a privileged command such as -x, causing control_recvdata() to free the client object while the same READ+HANGUP event subsequently reaches control_hangup() with the stale pointer, resulting in a use-after-free condition exploitable in deployments using --disable-privsep or where privsep initialization has failed with the control socket operating in mode 0666.
How severe is CVE-2026-56117?: CVE-2026-56117 has a CVSS 3.x base score of 4.7, rated medium severity. It is exploitable over local access with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-56117 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (1st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-56117?: CVE-2026-56117 affects Dhcpcd Project Dhcpcd. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-56117?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-56117 have an EU (EUVD) identifier?: Yes. CVE-2026-56117 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-38498.
When was CVE-2026-56117 published?: CVE-2026-56117 was published on 2026-06-23 and last updated on 2026-06-28.

References

Affected products (1)

cpe:2.3:a:dhcpcd_project:dhcpcd:*:*:*:*:*:*:*:*

More vulnerabilities in Dhcpcd Project Dhcpcd

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