VULNERABILITY INTELLIGENCE

CVE-2026-56113

CVSS score5.3 MEDIUM
EPSS probability0.27%
CISA KEVNot currently listed
Published2026-06-23
Last modified2026-10-25
CVSS vectorCVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Description

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.

Weakness classification

  • disclosure@vulncheck.com: CWE-416

Primary references