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Vulnerability · Published Jun 23, 2026 · Assigned by VulnCheck

CVE-2026-56117dhcpcd Heap Use-After-Free via Control Socket Handling

Medium 4.7

In plain English

A medium-severity use-after-free in dhcpcd from NetworkConfiguration. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 3% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)4.7Medium
Exploit odds (30 days)0.1%top 97.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Alpine:v3.23dhcpcd10.5.2-r0ALPINE-CVE-2026-56117
Alpine:v3.24dhcpcd10.5.2-r0ALPINE-CVE-2026-56117
Debian:13dhcpcd1:10.1.0-11+deb13u3DEBIAN-CVE-2026-56117
Debian:14dhcpcd1:10.3.2-4DEBIAN-CVE-2026-56117
Ubuntu:24.04:LTSdhcpcdno fix listedUBUNTU-CVE-2026-56117
Ubuntu:25.10dhcpcdno fix listedUBUNTU-CVE-2026-56117
Ubuntu:26.04:LTSdhcpcdno fix listedUBUNTU-CVE-2026-56117

Affected products (as reported)

VendorProductVersions
NetworkConfiguration dhcpcd 0 – through 10.3.2

Weakness: CWE-416 · Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

References