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

Quick assessment

Affected
NetworkConfiguration dhcpcd
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

NetworkConfiguration dhcpcd是NetworkConfiguration团队的一款DHCP客户端软件。 NetworkConfiguration dhcpcd 10.3.2及之前版本存在资源管理错误漏洞，该漏洞源于src/control.c中控制套接字处理存在堆释放后重用，可能导致本地低权限攻击者在权限分离禁用时触发内存损坏。

CVSS 4.7 · Medium EPSS 0.14% · P3

Affected Version Matrix 2

VendorProduct Version RangeStatus
NetworkConfiguration dhcpcd ≤ 10.3.2 affected
78ea09ed1633a583dbcde6e7bab9df4639ec8a34 unaffected
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I. Basic Information for CVE-2026-56117

Vulnerability Information
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Vulnerability Title
dhcpcd Heap Use-After-Free via Control Socket Handling
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
释放后使用
Source: CVE Program / CVE List V5
Vulnerability Title
NetworkConfiguration dhcpcd 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
NetworkConfiguration dhcpcd是NetworkConfiguration团队的一款DHCP客户端软件。 NetworkConfiguration dhcpcd 10.3.2及之前版本存在资源管理错误漏洞，该漏洞源于src/control.c中控制套接字处理存在堆释放后重用，可能导致本地低权限攻击者在权限分离禁用时触发内存损坏。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
NetworkConfiguration dhcpcd 0 ~ 10.3.2 -

II. Public POCs for CVE-2026-56117

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III. Intelligence Information for CVE-2026-56117

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News Coverage for CVE-2026-56117 (1)

Same Patch Batch · NetworkConfiguration · 2026-06-23 · 4 CVEs total

CVE-2026-56116 6.5 MEDIUM dhcpcd Memory Leak DoS via IPv6 Router Advertisement Handling
CVE-2026-56113 5.3 MEDIUM dhcpcd Heap Use-After-Free in dhcp6_deprecateaddrs via DHCPv6 RENEW
CVE-2026-56114 5.3 MEDIUM dhcpcd Stack Out-of-Bounds Write in dhcp6_makemessage()

IV. Related Vulnerabilities

Same product: dhcpcd
Same vendor: NetworkConfiguration
Same weakness: CWE-416