CVE-2026-56117 | dhcpcd through 10.3.2, fixed in commit 78ea09e, contains a h… | CVSS 4.7 MEDIUM

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.

Metadata

CVE ID: CVE-2026-56117
State: PUBLISHED
Assigner: VulnCheck
Reserved: 2026-06-18 19:15 UTC
Published: 2026-06-23 16:14 UTC
Last updated: 2026-06-23 16:14 UTC
Primary CWE: CWE-416
Use After Free
Vendor / Product: NetworkConfiguration / dhcpcd
Sources: cve.org · NVD

Severity & Metrics

4.7 MEDIUM CVSS 3.1

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected products (1)

Vendor	Product	Platform	Versions
NetworkConfiguration	dhcpcd	—	0 ≤ 10.3.2, 78ea09ed1633a583dbcde6e7bab9df4639ec8a34

Weakness (CWE)

CWE	Source	Description
CWE-416	cna	Use After Free

CVSS scores (2)

Score	Severity	Version	Source	Vector
5.7	MEDIUM	4.0	cna	CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
4.7	MEDIUM	3.1	cna	CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

References (2)