CVE catalog
CVE-2026-56117
dhcpcd through 10.3.2, fixed in commit 78ea09e, contains a heap use-after-free vulnerability in the control socket handling within src/control.c that allows local unprivileged attackers to trigger mem
- Severity
- Medium · CVSS 5.7
CVSS:4.0/AV:L/AC:L/AT:P/PR:L/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 - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.14% · Oct 27, 2026
dhcpcd through 10.3.2, fixed in commit 78ea09e, contains a heap use-after-free vulnerability in the control socket handling within src/control.c that allows local unprivileged attackers to trigger memory corruption when privilege separation is disabled. Attackers can connect to the control socket and send a privileged command such as -x, causing control_recvdata() to free the client object while the same READ+HANGUP event subsequently reaches control_hangup() with the stale pointer, resulting in a use-after-free condition exploitable in deployments using --disable-privsep or where privsep initialization has failed with the control socket operating in mode 0666.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Cpe | dhcpcd | Not reported | Not reported | unknown |
| Debian | dhcpcd | 13 | 1:10.1.0-11 | vulnerable |
| Debian | dhcpcd | 13 | 1:10.1.0-11+deb13u1 | vulnerable |
| Debian | dhcpcd | 13 | 1:10.1.0-11+deb13u2 | vulnerable |
| Debian | dhcpcd | 13 | 1:10.1.0-11+deb13u3 | fixed |
| Debian | dhcpcd | 14 | 1:10.1.0-11 | vulnerable |
| Debian | dhcpcd | 14 | 1:10.1.0-12 | vulnerable |
| Debian | dhcpcd | 14 | 1:10.2.0-1 | vulnerable |
| Debian | dhcpcd | 14 | 1:10.2.2-1 | vulnerable |
| Debian | dhcpcd | 14 | 1:10.2.2-2 | vulnerable |
| Debian | dhcpcd | 14 | 1:10.2.2-3 | vulnerable |
| Debian | dhcpcd | 14 | 1:10.2.2-4 | vulnerable |
| Debian | dhcpcd | 14 | 1:10.2.2-5 | vulnerable |
| Debian | dhcpcd | 14 | 1:10.2.2-6 | vulnerable |
| Debian | dhcpcd | 14 | 1:10.2.3-1 | vulnerable |
| Debian | dhcpcd | 14 | 1:10.2.4-1 | vulnerable |
| Debian | dhcpcd | 14 | 1:10.2.4-2 | vulnerable |
| Debian | dhcpcd | 14 | 1:10.2.4-3 | vulnerable |
| Debian | dhcpcd | 14 | 1:10.2.4-4 | vulnerable |
| Debian | dhcpcd | 14 | 1:10.2.4-4~bpo13+1 | vulnerable |
| Debian | dhcpcd | 14 | 1:10.3.0-1 | vulnerable |
| Debian | dhcpcd | 14 | 1:10.3.0-2 | vulnerable |
| Debian | dhcpcd | 14 | 1:10.3.0-2~bpo13+1 | vulnerable |
| Debian | dhcpcd | 14 | 1:10.3.0-3 | vulnerable |
| Debian | dhcpcd | 14 | 1:10.3.0-3~bpo13+1 | vulnerable |
| Debian | dhcpcd | 14 | 1:10.3.0-4 | vulnerable |
| Debian | dhcpcd | 14 | 1:10.3.0-5 | vulnerable |
| Debian | dhcpcd | 14 | 1:10.3.0-6 | vulnerable |
| Debian | dhcpcd | 14 | 1:10.3.0-7 | vulnerable |
| Debian | dhcpcd | 14 | 1:10.3.0-7~bpo13+1 | vulnerable |
| Debian | dhcpcd | 14 | 1:10.3.1-1 | vulnerable |
| Debian | dhcpcd | 14 | 1:10.3.1-1~bpo13+1 | vulnerable |
| Debian | dhcpcd | 14 | 1:10.3.1-2 | vulnerable |
| Debian | dhcpcd | 14 | 1:10.3.1-3 | vulnerable |
| Debian | dhcpcd | 14 | 1:10.3.1-4 | vulnerable |
| Debian | dhcpcd | 14 | 1:10.3.1-5 | vulnerable |
| Debian | dhcpcd | 14 | 1:10.3.1-5~bpo13+1 | vulnerable |
| Debian | dhcpcd | 14 | 1:10.3.2-1 | vulnerable |
| Debian | dhcpcd | 14 | 1:10.3.2-2 | vulnerable |
| Debian | dhcpcd | 14 | 1:10.3.2-3 | vulnerable |
| Debian | dhcpcd | 14 | 1:10.3.2-3~bpo13+1 | vulnerable |
| Debian | dhcpcd | 14 | 1:10.3.2-4~bpo13+1 | vulnerable |
| Debian | dhcpcd | 14 | 1:10.3.2-4 | fixed |
| Alpine | dhcpcd | 3.23 | 10.5.2-r0 | fixed |
| Alpine | dhcpcd | 3.24 | 10.5.2-r0 | fixed |
| Ubuntu | dhcpcd | 24.04 | 1:10.0.2-3ubuntu3 | vulnerable |
| Ubuntu | dhcpcd | 24.04 | 1:10.0.5-1 | vulnerable |
| Ubuntu | dhcpcd | 24.04 | 1:10.0.5-2 | vulnerable |
| Ubuntu | dhcpcd | 24.04 | 1:10.0.5-3 | vulnerable |
| Ubuntu | dhcpcd | 24.04 | 1:10.0.5-4 | vulnerable |
| Ubuntu | dhcpcd | 24.04 | 1:10.0.5-5 | vulnerable |
| Ubuntu | dhcpcd | 24.04 | 1:10.0.6-1 | vulnerable |
| Ubuntu | dhcpcd | 24.04 | 1:10.0.6-1ubuntu1 | vulnerable |
| Ubuntu | dhcpcd | 24.04 | 1:10.0.6-1ubuntu2 | vulnerable |
| Ubuntu | dhcpcd | 24.04 | 1:10.0.6-1ubuntu3 | vulnerable |
| Ubuntu | dhcpcd | 24.04 | 1:10.0.6-1ubuntu3.1 | vulnerable |
| Ubuntu | dhcpcd | 24.04 | 1:10.0.6-1ubuntu3.2 | vulnerable |
| Ubuntu | dhcpcd | 25.10 | 1:10.1.0-8 | vulnerable |
| Ubuntu | dhcpcd | 25.10 | 1:10.1.0-10 | vulnerable |
| Ubuntu | dhcpcd | 25.10 | 1:10.1.0-11 | vulnerable |
| Ubuntu | dhcpcd | 25.10 | 1:10.1.0-12 | vulnerable |
| Ubuntu | dhcpcd | 25.10 | 1:10.2.4-3 | vulnerable |
| Ubuntu | dhcpcd | 25.10 | 1:10.2.4-4 | vulnerable |
| Ubuntu | dhcpcd | 26.04 | 1:10.2.4-4 | vulnerable |
| Ubuntu | dhcpcd | 26.04 | 1:10.3.0-2 | vulnerable |
| Ubuntu | dhcpcd | 26.04 | 1:10.3.0-3 | vulnerable |
| Ubuntu | dhcpcd | 26.04 | 1:10.3.0-7 | vulnerable |
| Cpe | dhcpcd | Not reported | Not reported | unknown |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | dhcpcd | deb | 13 | 1:10.1.0-11+deb13u3 | Not reported | DEBIAN-CVE-2026-56117 | Not reported |
| Debian | dhcpcd | deb | 14 | 1:10.3.2-4 | Not reported | DEBIAN-CVE-2026-56117 | Not reported |
| Alpine | dhcpcd | apk | 3.23 | 10.5.2-r0 | Not reported | ALPINE-CVE-2026-56117 | Not reported |
| Alpine | dhcpcd | apk | 3.24 | 10.5.2-r0 | Not reported | ALPINE-CVE-2026-56117 | Not reported |
OpenFactory catalog packages
[Debian 13 (Trixie)]
- [dhcpcd]Fixed
Details (4)
1:10.1.0-11+deb13u3· all · trixieFixed · Fixed:
1:10.1.0-11+deb13u3nvd · dhcpcd · debian · 13
1:10.1.0-11+deb13u3· all · trixieFixed · Fixed:
1:10.1.0-11+deb13u3nvd · dhcpcd · debian · 13
1:10.5.2-1~bpo13+1· all · trixie-backportsFixed · Fixed:
1:10.1.0-11+deb13u3nvd · dhcpcd · debian · 13
1:10.5.2-1~bpo13+1· all · trixie-backportsFixed · Fixed:
1:10.1.0-11+deb13u3nvd · dhcpcd · debian · 13
- [dhcpcd5]Fixed
Source package: [dhcpcd]
Details (4)
1:10.1.0-11+deb13u3· all · trixieFixed · Fixed:
1:10.1.0-11+deb13u3nvd · dhcpcd · debian · 13
1:10.1.0-11+deb13u3· all · trixieFixed · Fixed:
1:10.1.0-11+deb13u3nvd · dhcpcd · debian · 13
1:10.5.2-1~bpo13+1· all · trixie-backportsFixed · Fixed:
1:10.1.0-11+deb13u3nvd · dhcpcd · debian · 13
1:10.5.2-1~bpo13+1· all · trixie-backportsFixed · Fixed:
1:10.1.0-11+deb13u3nvd · dhcpcd · debian · 13
- [dhcpcd-base]Fixed
Source package: [dhcpcd]
Details (4)
1:10.1.0-11+deb13u3· amd64 · trixieFixed · Fixed:
1:10.1.0-11+deb13u3nvd · dhcpcd · debian · 13
1:10.1.0-11+deb13u3· arm64 · trixieFixed · Fixed:
1:10.1.0-11+deb13u3nvd · dhcpcd · debian · 13
1:10.5.2-1~bpo13+1· amd64 · trixie-backportsFixed · Fixed:
1:10.1.0-11+deb13u3nvd · dhcpcd · debian · 13
1:10.5.2-1~bpo13+1· arm64 · trixie-backportsFixed · Fixed:
1:10.1.0-11+deb13u3nvd · dhcpcd · debian · 13
Observed:
References
- [https://ftp.suse.com/pub/projects/security/csaf/opensuse-su-2026_11473-1.json]
- [https://github.com/NetworkConfiguration/dhcpcd/commit/78ea09ed1633a583dbcde6e7bab9df4639ec8a34]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-56117]
- [https://osv.dev/vulnerability/ALPINE-CVE-2026-56117]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-56117]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2026-56117]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-56117.json]
- [https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-2046.json]
- [https://www.vulncheck.com/advisories/dhcpcd-heap-use-after-free-via-control-socket-handling]
[CERT-Bund public advisories] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]