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CVE-2026-56116

dhcpcd Memory Leak DoS via IPv6 Router Advertisement Handling

Published: Jun 23, 2026Updated: Jul 14, 2026 Sources: CVE List NVDCWE-401
6.5MEDIUM
NVD MITRE
EPSS Score
0.2%
Top 91.4%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
Not available

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:AAC:LPR:NUI:NS:UC:NI:NA:H
Exploitability
AV:AAttack Vector
Adjacent
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
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Weaknesses

CWE-401

Affected Products

dhcpcd project
oss-projectaka dhcpcd
dhcpcdOn-prem
Networking Infrastructure / dns-dhcp-ntp
NetworkConfiguration
oss-project
dhcpcdLibrary
Networking Infrastructure / dns-dhcp-ntp

Exploitability

Official Patch Available

References

https://github.com/NetworkConfiguration/dhcpcd/commit/708b4a56bae080a5b18c2e0c4c6fbe103131a2b0
github.com
https://www.vulncheck.com/advisories/dhcpcd-memory-leak-dos-via-ipv6-router-advertisement-handling
vulncheck.com

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