# CVE-2026-14258: Dhcpcd: dhcpcd infinite loop and out-of-bounds read via zero-length ipv6 nd option in router advertisement handling

CVE-2026-14258 is fixed in dhcpcd on 1 platform, first by RHSA-2026:54210, released December 1, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-14258
- Priority: Routine
- CVSS: 6.5 (Moderate)
- EPSS: 0.0040
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Dec 1, 2024
- Weakness: Loop with Unreachable Exit Condition ('Infinite Loop')
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-14258

## Description

A flaw was found in dhcpcd's IPv6 Neighbor Discovery Router Advertisement processing. A specially crafted IPv6 Router Advertisement containing a zero-length Neighbor Discovery option can bypass validation during packet storage and later be reparsed without adequate validation, causing the parser to enter a non-advancing loop. Successful exploitation may result in excessive CPU consumption, leading to a denial of service.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | dhcpcd Debian 13.5 (trixie) | 1:10.1.0-11+deb13u4 | [DEBIAN-CVE-2026-14258](https://patchblox.com/security/data/fix/linux/debian-cve-2026-14258.md) | Jul 2, 2026 |
| Linux | dhcpcd Debian 14 | 1:10.2.4-3 | [DEBIAN-CVE-2026-14258](https://patchblox.com/security/data/fix/linux/debian-cve-2026-14258.md) | Jul 2, 2026 |
| Linux | dhcpcd RHEL 10 | 10.0.6-11.el10_2 | [RHSA-2026:54210](https://patchblox.com/security/data/fix/linux/rhsa-2026-54210.md) | Dec 1, 2024 |
| Linux | dhcpcd almalinux 10 | 10.0.6-11.el10_2 | [ALSA-2026:54210](https://patchblox.com/security/data/fix/linux/alsa-2026-54210.md) | Aug 12, 2026 |
| Linux | dhcpcd ol 10 | 0:10.0.6-11.el10_2 | [ELSA-2026-54210](https://patchblox.com/security/data/fix/linux/elsa-2026-54210.md) | Aug 13, 2026 |
| Linux | dhcpcd rocky 10 | 0:10.0.6-11.el10_2 | [RLSA-2026:54210](https://patchblox.com/security/data/fix/linux/rlsa-2026-54210.md) | Aug 13, 2026 |

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Data as of 2026-11-08T19:12:23Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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