{"id":"CVE-2026-56116","title":"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 craf…","summary":"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 craf…","severity":"medium","cvss":6.5,"cvssVector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-401"],"vendor":"dhcpcd_project","product":"dhcpcd","affected":["dhcpcd >= 10.0.7, < 10.5.0"],"patched":["dhcpcd 10.5.0"],"published":"2026-06-23","updated":"2026-10-08","sourceUpdated":"2026-10-08T18:06:14.020","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-56116","references":[{"url":"https://github.com/NetworkConfiguration/dhcpcd/commit/708b4a56bae080a5b18c2e0c4c6fbe103131a2b0","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/dhcpcd-memory-leak-dos-via-ipv6-router-advertisement-handling","label":"disclosure@vulncheck.com"}],"tags":["nvd"],"epss":0.00288,"epssPercentile":0.19562,"ingestedAt":"2026-10-08T18:58:11.292Z","slug":"CVE-2026-56116","body":"## Overview\n\ndhcpcd 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.\n\n## Affected\n\n- `dhcpcd >= 10.0.7, < 10.5.0`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `dhcpcd 10.5.0`","depth":"sunlit","depthScore":36,"depthScoreParts":{"impact":35.8,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}