CVE-2026-56113
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.
- Affected products
- Dhcpcd
- Dhcpcd Project Dhcpcd
- ≤ 10.3.2
- Fix
- Available
- CVSS 3.1
- 6.5 MEDIUM
- EPSS
- 0.3% (19th percentile)
- Weakness
- CWE-416
- NVD status
- Analyzed
- Published
- 2026-06-23
No indexed exploits for CVE-2026-56113 yet
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