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CVE-2026-56113— dhcpcd Heap Use-After-Free in dhcp6_deprecateaddrs via DHCPv6 RENEW

CVSS 5.3 · Medium EPSS 0.18% · P7

Possible ATT&CK Techniques 1AI

T1498.001 · Direct Network Flood

Affected Version Matrix 2

VendorProductVersion RangeStatus
NetworkConfigurationdhcpcd≤ 10.3.2affected
5733d3c59a5651f64357ac11c98b4f39895c8d25unaffected
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I. Basic Information for CVE-2026-56113

Vulnerability Information
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Vulnerability Title
dhcpcd Heap Use-After-Free in dhcp6_deprecateaddrs via DHCPv6 RENEW
Source: CVE Program / CVE List V5
Vulnerability Description
dhcpcd through 10.3.2, fixed in commit 5733d3c, contains a heap use-after-free vulnerability that allows unauthenticated same-link attackers to crash the daemon by sending a crafted DHCPv6 RENEW reply with RFC6603 OPTION_PD_EXCLUDE and both preferred and valid lifetimes set to zero. Attackers acting as or impersonating a DHCPv6 server can trigger dhcp6_deprecatedele() to free a delegated child address while an outer TAILQ_FOREACH_SAFE iterator in dhcp6_deprecateaddrs() still holds the freed pointer, causing a use-after-free when TAILQ_REMOVE is reached.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:H/PR:N/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，该漏洞源于存在堆释放后重用问题，可能导致未经身份验证的同链路攻击者通过发送特制的带RFC6603 OPTION_PD_EXCLUDE且优先和有效期限设为零的DHCPv6 RENEW回复，导致守护进程崩溃。
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

VendorProductAffected VersionsCPESubscribe
NetworkConfigurationdhcpcd 0 ~ 10.3.2 -

II. Public POCs for CVE-2026-56113

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III. Intelligence Information for CVE-2026-56113

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Patches & Fixes for CVE-2026-56113 (1)

Vendor Advisories for CVE-2026-56113 (1)

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

CVE-2026-561166.5 MEDIUMdhcpcd Memory Leak DoS via IPv6 Router Advertisement Handling
CVE-2026-561145.3 MEDIUMdhcpcd Stack Out-of-Bounds Write in dhcp6_makemessage()
CVE-2026-561174.7 MEDIUMdhcpcd Heap Use-After-Free via Control Socket Handling

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-56113

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