{"id":"DEBIAN-CVE-2026-56113","details":"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.","modified":"2026-09-14T17:03:20.649708120Z","published":"2026-06-23T17:17:09.030Z","upstream":["CVE-2026-56113"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-56113"}],"affected":[{"package":{"name":"dhcpcd","ecosystem":"Debian:13","purl":"pkg:deb/debian/dhcpcd?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:10.1.0-11+deb13u3"}]}],"versions":["1:10.1.0-11","1:10.1.0-11+deb13u1","1:10.1.0-11+deb13u2"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-56113.json"}},{"package":{"name":"dhcpcd","ecosystem":"Debian:14","purl":"pkg:deb/debian/dhcpcd?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:10.3.2-4"}]}],"versions":["1:10.1.0-11","1:10.1.0-12","1:10.2.0-1","1:10.2.2-1","1:10.2.2-2","1:10.2.2-3","1:10.2.2-4","1:10.2.2-5","1:10.2.2-6","1:10.2.3-1","1:10.2.4-1","1:10.2.4-2","1:10.2.4-3","1:10.2.4-4","1:10.2.4-4~bpo13+1","1:10.3.0-1","1:10.3.0-2","1:10.3.0-2~bpo13+1","1:10.3.0-3","1:10.3.0-3~bpo13+1","1:10.3.0-4","1:10.3.0-5","1:10.3.0-6","1:10.3.0-7","1:10.3.0-7~bpo13+1","1:10.3.1-1","1:10.3.1-1~bpo13+1","1:10.3.1-2","1:10.3.1-3","1:10.3.1-4","1:10.3.1-5","1:10.3.1-5~bpo13+1","1:10.3.2-1","1:10.3.2-2","1:10.3.2-3","1:10.3.2-3~bpo13+1","1:10.3.2-4~bpo13+1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-56113.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}