CVE-2026-56113
published 2026-06-23CVE-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…
PriorityP428medium6.5CVSS 3.1
AVAACLPRNUINSUCNINAH
EPSS
0.18%
7.2th percentile
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
3 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| dhcpcd_project | dhcpcd | <= 10.3.2 | — |
| dhcpcd_project | dhcpcd | — | — |
| networkconfiguration | dhcpcd | <= 10.3.2 | — |
CVSS provenance
nvdv3.16.5MEDIUMCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
nvdv4.06.0MEDIUMCVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vendor_redhat5.3MEDIUM
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VulDB
NetworkConfiguration dhcpcd up to 10.3.2 dhcp6_deprecatedele use after free
vuldb·2026-06-24·CVSS 5.3
CVE-2026-56113 [MEDIUM] NetworkConfiguration dhcpcd up to 10.3.2 dhcp6_deprecatedele use after free
A vulnerability was found in NetworkConfiguration dhcpcd up to 10.3.2 and classified as critical. This vulnerability affects the function dhcp6_deprecatedele. Executing a manipulation can lead to use after free.
This vulnerability is registered as CVE-2026-56113. The attack requires access to the local network. No exploit is available.
It is suggested to upgrade the affected component.
GHSA
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
ghsa_unreviewed·2026-06-23
CVE-2026-56113 [MEDIUM] CWE-416 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
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.
Red Hat
dhcpcd: dhcpcd: Denial of Service via crafted DHCPv6 RENEW reply
vendor_redhat·2026-06-23·CVSS 5.3
CVE-2026-56113 [MEDIUM] CWE-825 dhcpcd: dhcpcd: Denial of Service via crafted DHCPv6 RENEW reply
dhcpcd: dhcpcd: Denial of Service via crafted DHCPv6 RENEW reply
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.
A flaw was found in dhcpcd. An unauthenticated attacker on the same network link can exploit this vulnerability by sending a specially crafted DHCPv6 RENEW reply. This can l
No detection rules found.
No public exploits indexed.
Bugzilla
CVE-2026-56113 dhcpcd: dhcpcd: Denial of Service via crafted DHCPv6 RENEW reply [epel-all]
bugzilla·2026-06-23·CVSS 5.3
CVE-2026-56113 [MEDIUM] CVE-2026-56113 dhcpcd: dhcpcd: Denial of Service via crafted DHCPv6 RENEW reply [epel-all]
CVE-2026-56113 dhcpcd: dhcpcd: Denial of Service via crafted DHCPv6 RENEW reply [epel-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
Bugzilla
CVE-2026-56113 dhcpcd: dhcpcd: Denial of Service via crafted DHCPv6 RENEW reply [fedora-all]
bugzilla·2026-06-23·CVSS 5.3
CVE-2026-56113 [MEDIUM] CVE-2026-56113 dhcpcd: dhcpcd: Denial of Service via crafted DHCPv6 RENEW reply [fedora-all]
CVE-2026-56113 dhcpcd: dhcpcd: Denial of Service via crafted DHCPv6 RENEW reply [fedora-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
Bugzilla
CVE-2026-56113 dhcpcd: dhcpcd: Denial of Service via crafted DHCPv6 RENEW reply
bugzilla·2026-06-23·CVSS 5.3
CVE-2026-56113 [MEDIUM] CVE-2026-56113 dhcpcd: dhcpcd: Denial of Service via crafted DHCPv6 RENEW reply
CVE-2026-56113 dhcpcd: dhcpcd: Denial of Service via crafted DHCPv6 RENEW reply
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.
2026-06-23
Published