What is CVE-2026-42512?

CVE-2026-42512 is a high-severity vulnerability in Freebsd, classified under Heap-based Buffer Overflow. CVSS score: 8.1/10. Published 2026-04-30.

How severe is CVE-2026-42512?

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

Buffer overflow in Freebsd

CVE-2026-42512

As dhclient is building an environment to pass to dhclient-script, it may need to resize the array of string pointers. The code which expands the array incorrectly calculates its new size when requesting memory, resulting in a heap buffer…

Vulnerability class: Buffer Overflow

EPSS: 0.001 (20.4th 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-122 — Heap-based Buffer Overflow

References

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

Frequently asked questions

What is CVE-2026-42512?: CVE-2026-42512 is a high-severity vulnerability in Freebsd, classified under Heap-based Buffer Overflow. CVSS score: 8.1/10. Published 2026-04-30.
How severe is CVE-2026-42512?: High severity. CVSS v3 base score is 8.1 out of 10.