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    CVE-2026-56114

    dhcpcd through 10.3.2, fixed in commit 2f00c7b, contains a one-byte stack out-of-bounds write vulnerability in dhcp6_makemessage() in src/dhcp6.c that allows unauthenticated same-link attackers to write beyond a fixed local buffer by serializing an oversized RFC6603 OPTION_PD_EXCLUDE option body. Attackers can send a crafted DHCPv6 ADVERTISE message containing an IA_PD IAPREFIX /0 with a valid OPTION_PD_EXCLUDE using an exclude prefix length of /121 through /128 to trigger the out-of-bounds write and potentially corrupt adjacent stack memory.

    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 Weakness Enumeration

    CWE-787 Out-of-bounds Write

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    CVE-2026-14258 (CVSS 6.5) — A flaw was found in dhcpcd's IPv6 Neighbor Discovery Router Advertisement processing. A specially crafted IPv6…
    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-2026-56113 (CVSS 6) — dhcpcd through 10.3.2, fixed in commit 5733d3c, contains a heap use-after-free vulnerability that allows unaut…
    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