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VulnerabilityCVE-2026-56116Published 2026-06-23

CVE-2026-56116 — NetworkConfiguration dhcpcd

medium

As of 2026-06-23, CVE-2026-56116 is a MEDIUM-severity vulnerability in NetworkConfiguration dhcpcd, CVSS v3.1 6.5, EPSS 0.1% (8.4th percentile). No Threadlinqs-tracked threat campaign has been attributed to CVE-2026-56116 as of 2026-06-23; the identifier is re-checked against the Threadlinqs threat corpus on every daily ingest.

CVSS v3.1
6.5/10Medium
EPSS
0.1%Higher than 8.4% of scored CVEs
CISA KEV
NoNot in the KEV catalog
Tracked threats
0None linked yet
Priority
3.6/10Threadlinqs triage score
Published
CVSS v3.1 6.5 (MEDIUM) · CVSS v4.0 7.1 · EPSS 0.1% (higher than 8.4% of all scored CVEs) · Priority 3.6/10 · Published 2026-06-23

Last updated:

What is 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.

The record classifies CVE-2026-56116 under weakness class CWE-401. Its CVSS v3 base vector states that the flaw is reachable from an adjacent network, needs no prior authentication, needs no user interaction, and has high impact on availability. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 104 days ago.

Severity and exploitation probability

CVSS v3.1 base score
6.5 — MEDIUM
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0 base score
7.1
CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
EPSS (FIRST)
0.1% probability of exploitation in the next 30 days, higher than 8.4% of all scored CVEs
CISA KEV
Not listed in the CISA Known Exploited Vulnerabilities catalog
Threadlinqs priority
3.6/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
Published
2026-06-23

Is CVE-2026-56116 being exploited?

It currently carries a trending score of 32 in the Threadlinqs vulnerability feed.

Affected products and versions

How to fix CVE-2026-56116

No vendor patch reference has been recorded for CVE-2026-56116 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

Threat activity tracking CVE-2026-56116

No threat campaign in the Threadlinqs corpus currently references CVE-2026-56116, in its CVE list or as an indicator. The linkage is recomputed from the live corpus on every daily ingest, so this section fills in as soon as a tracked campaign cites the identifier.

Sources

Enriched from CVE.org, NVD, FIRST EPSS. Last verified by Threadlinqs on . This product uses the NVD API but is not endorsed or certified by the NVD.

Vendor advisory and patch

Third-party advisory