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    CVE-2026-56113

    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.

    Published:Jun 23, 2026
    Last Modified:Jul 28, 2026
    EPS:Jun 23, 2026
    EPSS Score:0.00175
    CVSS Score:5.3

    Affected Products

    Vendor
    Dhcpcd Project
    Product
    Dhcpcd
    Vendor
    Networkconfiguration
    Product
    Dhcpcd

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

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    CVE-2026-56117 (CVSS 5.7) — dhcpcd through 10.3.2, fixed in commit 78ea09e, contains a heap use-after-free vulnerability in the control so…
    CVE-2026-56116 (CVSS 7.1) — dhcpcd through 10.3.2, fixed in commit 708b4a5, contains a memory leak vulnerability in the IPv6 Router Advert…
    CVE-2026-56114 (CVSS 6) — dhcpcd through 10.3.2, fixed in commit 2f00c7b, contains a one-byte stack out-of-bounds write vulnerability in…
    CVE-2025-70102 (CVSS 6.3) — A NULL pointer dereference occurs in Roy Marples NetworkConfiguration/dhcpcd 10.3.0 while parsing configuratio…
    CVE-2019-11766 (CVSS 9.8) — dhcp6.c in dhcpcd before 6.11.7 and 7.x before 7.2.2 has a buffer over-read in the D6_OPTION_PD_EXCLUDE featur…
    CVE-2019-11579 (CVSS 5.3) — dhcp.c in dhcpcd before 7.2.1 contains a 1-byte read overflow with DHO_OPTSOVERLOADED.…
    CVE-2019-11578 (CVSS 5.9) — auth.c in dhcpcd before 7.2.1 allowed attackers to infer secrets by performing latency attacks.…
    CVE-2019-11577 (CVSS 9.8) — dhcpcd before 7.2.1 contains a buffer overflow in dhcp6_findna in dhcp6.c when reading NA/TA addresses.…
    CVE-2016-1504 (CVSS 7.5) — dhcpcd before 6.10.0 allows remote attackers to cause a denial of service (invalid read and crash) via vectors…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High