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VulnerabilityCVE-2026-56113Published 2026-06-23

CVE-2026-56113 — NetworkConfiguration dhcpcd

medium

As of 2026-06-23, CVE-2026-56113 is a MEDIUM-severity vulnerability in NetworkConfiguration dhcpcd, CVSS v3.1 5.3, EPSS 0.1% (7.1th percentile). No Threadlinqs-tracked threat campaign has been attributed to CVE-2026-56113 as of 2026-06-23; the identifier is re-checked against the Threadlinqs threat corpus on every daily ingest.

CVSS v3.1
5.3/10Medium
EPSS
0.1%Higher than 7.1% of scored CVEs
CISA KEV
NoNot in the KEV catalog
Tracked threats
0None linked yet
Priority
2.9/10Threadlinqs triage score
Published
CVSS v3.1 5.3 (MEDIUM) · CVSS v4.0 6 · EPSS 0.1% (higher than 7.1% of all scored CVEs) · Priority 2.9/10 · Published 2026-06-23

Last updated:

What is 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.

The record classifies CVE-2026-56113 under weakness class CWE-416. 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
5.3 — MEDIUM
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0 base score
6
CVSS:4.0/AV:A/AC:L/AT:P/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 7.1% of all scored CVEs
CISA KEV
Not listed in the CISA Known Exploited Vulnerabilities catalog
Threadlinqs priority
2.9/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
Published
2026-06-23

Is CVE-2026-56113 being exploited?

It currently carries a trending score of 31 in the Threadlinqs vulnerability feed.

Affected products and versions

How to fix CVE-2026-56113

No vendor patch reference has been recorded for CVE-2026-56113 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-2026-56113

No threat campaign in the Threadlinqs corpus currently references CVE-2026-56113, 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, GitHub Security Advisories. 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