# CVE-2026-56116: dhcpcd: dhcpcd through 10.3.2, fixed in commit 708b4a5, contains a memory leak vulnerability in the IPv6 Router Advertisement...

CVE-2026-56116 is fixed in dhcpcd on 1 platform, first by DEBIAN-CVE-2026-56116, released July 2, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-56116
- Priority: Routine
- CVSS: n/a
- EPSS: 0.0029
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jun 23, 2026

## Description

dhcpcd through 10.3.2, fixed in commit 708b4a5, contains a memory leak vulnerability in the IPv6 Router Advertisement route information handling that allows an unauthenticated same-link attacker to cause denial of service by sending crafted Router Advertisements. Attackers can repeatedly send Router Advertisements containing Route Information options with a lifetime of zero, triggering unfreed allocations in routeinfo_findalloc() that cause linear memory exhaustion and eventual daemon crash.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | dhcpcd Debian 13.5 (trixie) | 1:10.1.0-11+deb13u3 | [DEBIAN-CVE-2026-56116](https://patchblox.com/security/data/fix/linux/debian-cve-2026-56116.md) | Jul 2, 2026 |
| Linux | dhcpcd Debian 14 | 1:10.3.2-4 | [DEBIAN-CVE-2026-56116](https://patchblox.com/security/data/fix/linux/debian-cve-2026-56116.md) | Jul 2, 2026 |
| Linux | dhcpcd opensuse-leap 16.0 | 10.5.0-160000.1.1 | [OPENSUSE-SU-2026:21692-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21692-1.md) | Aug 30, 2026 |
| Linux | dhcpcd sles 16.0 | 10.5.0-160000.1.1 | [SUSE-SU-2026:23562-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-23562-1.md) | Aug 30, 2026 |

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Data as of 2026-11-09T01:18:40Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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