dhcpcd: dhcpcd through 10.3.2, fixed in commit 5733d3c, contains a heap use-after-free vulnerability that allows unauthentica...
CVE-2026-56113 is fixed in dhcpcd on 1 platform, first by DEBIAN-CVE-2026-56113, released July 2, 2026. It is not reported as exploited. Patch Radar priority: Routine.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| dhcpcd · Debian 13.5 (trixie) | 1:10.1.0-11+deb13u3 | DEBIAN-CVE-2026-56113 | Jul 2, 2026 |
| dhcpcd · Debian 14 | 1:10.3.2-4 | DEBIAN-CVE-2026-56113 | Jul 2, 2026 |
| dhcpcd · opensuse-leap 16.0 | 10.5.0-160000.1.1 | OPENSUSE-SU-2026:21692-1 | Aug 30, 2026 |
| dhcpcd · sles 16.0 | 10.5.0-160000.1.1 | SUSE-SU-2026:23562-1 | Aug 30, 2026 |
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