CVE-2026-56114
published 2026-06-23CVE-2026-56114: dhcpcd through 10.3.2, fixed in commit 2f00c7b, contains a one-byte stack out-of-bounds write vulnerability in dhcp6_makemessage() in src/dhcp6.c that allows…
PriorityP429medium6.5CVSS 3.1
AVAACLPRNUINSUCNINAH
EPSS
0.18%
7.2th percentile
dhcpcd through 10.3.2, fixed in commit 2f00c7b, contains a one-byte stack out-of-bounds write vulnerability in dhcp6_makemessage() in src/dhcp6.c that allows unauthenticated same-link attackers to write beyond a fixed local buffer by serializing an oversized RFC6603 OPTION_PD_EXCLUDE option body. Attackers can send a crafted DHCPv6 ADVERTISE message containing an IA_PD IAPREFIX /0 with a valid OPTION_PD_EXCLUDE using an exclude prefix length of /121 through /128 to trigger the out-of-bounds write and potentially corrupt adjacent stack memory.
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 src/dhcp6.c dhcp6_makemessage out-of-bounds write
vuldb·2026-06-24·CVSS 5.3
CVE-2026-56114 [MEDIUM] NetworkConfiguration dhcpcd up to 10.3.2 src/dhcp6.c dhcp6_makemessage out-of-bounds write
A vulnerability was found in NetworkConfiguration dhcpcd up to 10.3.2. It has been rated as critical. The affected element is the function dhcp6_makemessage of the file src/dhcp6.c. This manipulation causes out-of-bounds write.
This vulnerability appears as CVE-2026-56114. The attacker needs to be present on the local network. There is no available exploit.
Upgrading the affected component is advised.
GHSA
dhcpcd through 10.3.2, fixed in commit 2f00c7b, contains a one-byte stack out-of-bounds write vulnerability in dhcp6_makemessage() in src/dhcp6.c that allows unauthenticated same-link attackers to wri
ghsa_unreviewed·2026-06-23
CVE-2026-56114 [MEDIUM] CWE-787 dhcpcd through 10.3.2, fixed in commit 2f00c7b, contains a one-byte stack out-of-bounds write vulnerability in dhcp6_makemessage() in src/dhcp6.c that allows unauthenticated same-link attackers to wri
dhcpcd through 10.3.2, fixed in commit 2f00c7b, contains a one-byte stack out-of-bounds write vulnerability in dhcp6_makemessage() in src/dhcp6.c that allows unauthenticated same-link attackers to write beyond a fixed local buffer by serializing an oversized RFC6603 OPTION_PD_EXCLUDE option body. Attackers can send a crafted DHCPv6 ADVERTISE message containing an IA_PD IAPREFIX /0 with a valid OPTION_PD_EXCLUDE using an exclude prefix length of /121 through /128 to trigger the out-of-bounds write and potentially corrupt adjacent stack memory.
Red Hat
dhcpcd: dhcpcd: Denial of Service due to stack out-of-bounds write via crafted DHCPv6 message
vendor_redhat·2026-06-23·CVSS 5.3
CVE-2026-56114 [MEDIUM] CWE-787 dhcpcd: dhcpcd: Denial of Service due to stack out-of-bounds write via crafted DHCPv6 message
dhcpcd: dhcpcd: Denial of Service due to stack out-of-bounds write via crafted DHCPv6 message
dhcpcd through 10.3.2, fixed in commit 2f00c7b, contains a one-byte stack out-of-bounds write vulnerability in dhcp6_makemessage() in src/dhcp6.c that allows unauthenticated same-link attackers to write beyond a fixed local buffer by serializing an oversized RFC6603 OPTION_PD_EXCLUDE option body. Attackers can send a crafted DHCPv6 ADVERTISE message containing an IA_PD IAPREFIX /0 with a valid OPTION_PD_EXCLUDE using an exclude prefix length of /121 through /128 to trigger the out-of-bounds write and potentially corrupt adjacent stack memory.
A flaw was found in dhcpcd. An unauthenticated attacker on the same network link could exploit a one-byte stack out-of-bounds write vulnerability in the `d
No detection rules found.
No public exploits indexed.
Bugzilla
CVE-2026-56114 dhcpcd: dhcpcd: Denial of Service due to stack out-of-bounds write via crafted DHCPv6 message
bugzilla·2026-06-23·CVSS 5.3
CVE-2026-56114 [MEDIUM] CVE-2026-56114 dhcpcd: dhcpcd: Denial of Service due to stack out-of-bounds write via crafted DHCPv6 message
CVE-2026-56114 dhcpcd: dhcpcd: Denial of Service due to stack out-of-bounds write via crafted DHCPv6 message
dhcpcd through 10.3.2, fixed in commit 2f00c7b, contains a one-byte stack out-of-bounds write vulnerability in dhcp6_makemessage() in src/dhcp6.c that allows unauthenticated same-link attackers to write beyond a fixed local buffer by serializing an oversized RFC6603 OPTION_PD_EXCLUDE option body. Attackers can send a crafted DHCPv6 ADVERTISE message containing an IA_PD IAPREFIX /0 with a valid OPTION_PD_EXCLUDE using an exclude prefix length of /121 through /128 to trigger the out-of-bounds write and potentially corrupt adjacent stack memory.
Bugzilla
CVE-2026-56114 dhcpcd: dhcpcd: Denial of Service due to stack out-of-bounds write via crafted DHCPv6 message [epel-all]
bugzilla·2026-06-23·CVSS 5.3
CVE-2026-56114 [MEDIUM] CVE-2026-56114 dhcpcd: dhcpcd: Denial of Service due to stack out-of-bounds write via crafted DHCPv6 message [epel-all]
CVE-2026-56114 dhcpcd: dhcpcd: Denial of Service due to stack out-of-bounds write via crafted DHCPv6 message [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-2026-56114 dhcpcd: dhcpcd: Denial of Service due to stack out-of-bounds write via crafted DHCPv6 message [fedora-all]
bugzilla·2026-06-23·CVSS 5.3
CVE-2026-56114 [MEDIUM] CVE-2026-56114 dhcpcd: dhcpcd: Denial of Service due to stack out-of-bounds write via crafted DHCPv6 message [fedora-all]
CVE-2026-56114 dhcpcd: dhcpcd: Denial of Service due to stack out-of-bounds write via crafted DHCPv6 message [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.
2026-06-23
Published