How severe is CVE-2026-56116?

CVE-2026-56116 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-56116 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (9th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-56116?

CVE-2026-56116 affects Dhcpcd Project Dhcpcd. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-56116?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-56116 have an EU (EUVD) identifier?

Yes. CVE-2026-56116 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-38496.

When was CVE-2026-56116 published?

CVE-2026-56116 was published on 2026-06-23 and last updated on 2026-07-01.

CVE-2026-56116

CVE-2026-56116 is a medium-severity vulnerability in Dhcpcd Project Dhcpcd with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-401.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v4: 7.1
EPSS exploit prediction: 0% (9th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-38496
Weakness: CWE-401
Affected product: Dhcpcd Project Dhcpcd
Published: 2026-06-23
Last modified: 2026-07-01

Description

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.

Frequently asked questions

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.
How severe is CVE-2026-56116?: CVE-2026-56116 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-56116 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (9th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-56116?: CVE-2026-56116 affects Dhcpcd Project Dhcpcd. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-56116?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-56116 have an EU (EUVD) identifier?: Yes. CVE-2026-56116 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-38496.
When was CVE-2026-56116 published?: CVE-2026-56116 was published on 2026-06-23 and last updated on 2026-07-01.

References

Affected products (1)

cpe:2.3:a:dhcpcd_project:dhcpcd:*:*:*:*:*:*:*:*

More vulnerabilities in Dhcpcd Project Dhcpcd

CVE-2019-11766 — Critical (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 feature.
CVE-2019-11577 — Critical (CVSS 9.8): dhcpcd before 7.2.1 contains a buffer overflow in dhcp6_findna in dhcp6.c when reading NA/TA addresses.
CVE-2016-1503 — Critical (CVSS 9.8): dhcpcd before 6.10.0, as used in Android 4.x before 4.4.4, 5.0.x before 5.0.2, 5.1.x before 5.1.1, and 6.x before…
CVE-2016-1504 — High (CVSS 7.5): dhcpcd before 6.10.0 allows remote attackers to cause a denial of service (invalid read and crash) via vectors related…
CVE-2012-6700 — High (CVSS 7.5): The decode_search function in dhcp.c in dhcpcd 3.x does not properly free allocated memory, which allows remote DHCP…
CVE-2012-6699 — High (CVSS 7.5): The decode_search function in dhcp.c in dhcpcd 3.x allows remote DHCP servers to cause a denial of service…

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