What is CVE-2026-42511?

CVE-2026-42511 is a high-severity vulnerability in Freebsd, classified under CWE-149. CVSS score: 8.1/10. Published 2026-04-30.

How severe is CVE-2026-42511?

High severity. CVSS v3 base score is 8.1 out of 10.

Vulnerability in Freebsd

CVE-2026-42511

The BOOTP file field is written to the lease file without escaping embedded double-quotes, allowing injection of arbitrary dhclient.conf directives. When the lease file is subsequently re-parsed by dhclient, e.g., after a system restart…

EPSS: 0.000 (11.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Freebsd — versions 14.3, 13.5, 15.0

Weakness classification (CWE)

CWE-149

References

secteam@freebsd.org (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2026-42511?: CVE-2026-42511 is a high-severity vulnerability in Freebsd, classified under CWE-149. CVSS score: 8.1/10. Published 2026-04-30.
How severe is CVE-2026-42511?: High severity. CVSS v3 base score is 8.1 out of 10.