# CVE-2026-56116 — NetworkConfiguration dhcpcd

> 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.

**Last updated:** 2026-06-23

## 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](https://intel.threadlinqs.com/cwe/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

- [NetworkConfiguration](https://intel.threadlinqs.com/vendors/networkconfiguration): dhcpcd

## 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 2026-06-25. This product uses the NVD API but is not endorsed or certified by the NVD.

**Vendor advisory and patch**

- [github.com — patch](https://github.com/NetworkConfiguration/dhcpcd/commit/708b4a56bae080a5b18c2e0c4c6fbe103131a2b0)

**Third-party advisory**

- [vulncheck.com — third party advisory](https://www.vulncheck.com/advisories/dhcpcd-memory-leak-dos-via-ipv6-router-advertisement-handling)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-56116
Full detection coverage and IOCs for threats exploiting CVE-2026-56116 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp