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Fencer Vulns
medium 6.5

CVE-2026-14258 json

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

published 2026-07-01 4 mo ago modified 2026-11-05 3 d ago also EUVD-2026-40941

cvss
6.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 34%
public exploits
0
none known

Summary

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.

Patch / fix

  • Red Hat Red Hat Enterprise Linux 10 0:10.0.6-11.el10_2
  • dhcpcd Debian 13 1:10.1.0-11+deb13u4
  • dhcpcd Debian 14 1:10.2.4-3

debian advisories DEBIAN-CVE-2026-14258

  • dhcpcd RHEL 10.2 10.0.6-11.el10_2

red hat advisories RHSA-2026:54210

  • dhcpcd AlmaLinux 10 10.0.6-11.el10_2

almalinux advisories ALSA-2026:54210

  • dhcpcd Rocky Linux 10 10.0.6-11.el10_2

rocky linux advisories RLSA-2026:54210

  • dhcpcd Azure Linux 3.0 10.0.8-4

azure linux advisories AZL-91710

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-14258 updated cvss 6.5

dhcpcd: dhcpcd infinite loop and out-of-bounds read via zero-length IPv6 ND option in Router Advertisement handling

  • Red Hat Enterprise Linux BaseOS (v. 10) dhcpcd 10.0.6-11.el10_2
    fixed: vendor fix RHSA-2026:54210

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
partial
Assessed
4 mo ago

Exploit prediction

0.40% chance of exploitation in the next 30 days, higher than 34% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/NetworkConfiguration/dhcpcd/issues/415 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 6.5 CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

  • Red Hat Red Hat Enterprise Linux 10

Classification

Weakness
  • CWE-835 Loop with Unreachable Exit Condition

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.