CVE-2026-56116

dhcpcd through 10.3.2, fixed in commit 708b4a5, contains a memory leak vulnerability in the IPv6 Router Advertisement route information handling that allows an unauthenticated same-link attacker to cause denial of service by sending crafted Router Advertisements. Attackers can repeatedly send Router Advertisements containing Route Information options with a lifetime of zero, triggering unfreed allocations in routeinfo_findalloc() that cause linear memory exhaustion and eventual daemon crash.

Database specific

{
    "cna_assigner": "VulnCheck",
    "cwe_ids": [
        "CWE-401"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/56xxx/CVE-2026-56116.json"
}

References

Affected packages

Git / github.com/networkconfiguration/dhcpcd

Affected ranges

Type

GIT

Repo

https://github.com/networkconfiguration/dhcpcd

Events

Introduced

Fixed

708b4a56bae080a5b18c2e0c4c6fbe103131a2b0

Database specific

Show details

{
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "last_affected": "10.3.2"
        }
    ],
    "source": [
        "CPE_RANGE",
        "REFERENCES"
    ],
    "cpe": "cpe:2.3:a:dhcpcd_project:dhcpcd:*:*:*:*:*:*:*:*"
}

Affected versions

v10.*

v10.0.0

v10.0.1

v10.0.10

v10.0.2

v10.0.3

v10.0.4

v10.0.5

v10.0.6

v10.0.7

v10.0.8

v10.0.9

v10.1.0

v10.2.0

v10.2.1

v10.2.2

v10.2.3

v10.2.4

v10.3.0

v10.3.1

v10.3.2

v3.*

v3.2.3

v5.*

v5.0.1

v5.0.2

v5.0.3

v5.0.4

v5.0.5

v5.0.6

v5.1.0

v5.1.1

v5.1.2

v5.1.3

v5.1.4

v5.1.5

v5.2.0

v5.2.1

v5.2.10

v5.2.11

v5.2.12

v5.2.2

v5.2.3

v5.2.4

v5.2.6

v5.2.7

v5.2.9

v5.5.0

v5.5.1

v5.5.2

v5.5.3

v5.5.4

v5.5.5

v5.5.6

v5.6.0

v5.6.1

v5.6.2

v5.99.3

v5.99.6

v5.99.7

v6.*

v6.0.0

v6.0.1

v6.0.2

v6.0.3

v6.0.4

v6.0.5

v6.1.0

v6.10.0

v6.10.1

v6.10.2

v6.10.3

v6.11.0

v6.11.1

v6.11.2

v6.11.3

v6.2.0

v6.2.1

v6.3.0

v6.3.1

v6.3.2

v6.4.0

v6.4.1

v6.4.2

v6.4.3

v6.4.4

v6.4.5

v6.4.6

v6.4.7

v6.5.0

v6.5.1

v6.6.0

v6.6.1

v6.6.2

v6.6.3

v6.6.4

v6.6.5

v6.6.6

v6.6.7

v6.7.0

v6.7.1

v6.8.0

v6.8.1

v6.8.2

v6.9.0

v6.9.1

v6.9.2

v6.9.3

v6.9.4

v7.*

v7.0.0

v7.0.0-beta1

v7.0.0-beta2

v7.0.0-beta3

v7.0.0-rc1

v7.0.0-rc2

v7.0.0-rc3

v7.0.0-rc4

v7.0.1

v7.0.2

v7.0.3

v7.0.4

v7.0.5

v7.0.5a

v7.0.5b

v7.0.6

v7.0.7

v7.0.8

v7.1.0

v7.1.1

v8.*

v8.0.0

v8.0.1

v8.0.2

v8.0.3

v8.0.4

v8.0.5

v8.0.6

v8.1.0

v8.1.1

v8.1.2

v9.*

v9.0.0

v9.0.1

v9.0.2

v9.1.0

v9.1.1

v9.1.2

v9.1.3

v9.1.4

v9.2.0

v9.3.0

v9.3.1

v9.3.2

v9.3.3

v9.3.4

v9.4.0

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-56116.json"

vanir_signatures

[
    {
        "target": {
            "function": "ipv6nd_expirera",
            "file": "src/ipv6nd.c"
        },
        "deprecated": false,
        "source": "https://github.com/networkconfiguration/dhcpcd/commit/708b4a56bae080a5b18c2e0c4c6fbe103131a2b0",
        "id": "CVE-2026-56116-229095a6",
        "signature_version": "v1",
        "digest": {
            "length": 3337.0,
            "function_hash": "147220208220241771676475277637298184653"
        },
        "signature_type": "Function"
    },
    {
        "target": {
            "file": "src/ipv6nd.c"
        },
        "deprecated": false,
        "source": "https://github.com/networkconfiguration/dhcpcd/commit/708b4a56bae080a5b18c2e0c4c6fbe103131a2b0",
        "id": "CVE-2026-56116-2852a25f",
        "signature_version": "v1",
        "digest": {
            "threshold": 0.9,
            "line_hashes": [
                "126462191768933859182625905064871798288",
                "84695921800275119134825809965024024465",
                "312500445576796603602710037254256645037",
                "199358609586216563177532641102698207107"
            ]
        },
        "signature_type": "Line"
    }
]

vanir_signatures_modified

"2026-08-12T16:41:25Z"