What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-01 · updated 2026-10-25
• Weakness: CWE-835

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.

Affected products

• Red Hat Enterprise Linux 10: all versions — fixed in 0:10.0.6-11.el10_2

How to fix

Upgrade to a fixed version: Red Hat Enterprise Linux 10 0:10.0.6-11.el10_2. Check the vendor advisory for mitigations.

References

• https://access.redhat.com/errata/RHSA-2026:54210
• https://access.redhat.com/security/cve/CVE-2026-14258
• https://bugzilla.redhat.com/show_bug.cgi?id=2462305
• https://github.com/NetworkConfiguration/dhcpcd/commit/75289ca
• https://github.com/NetworkConfiguration/dhcpcd/issues/415
• https://github.com/NetworkConfiguration/dhcpcd/issues/415

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