What is CVE-2026-45251?

CVE-2026-45251 is a high-severity vulnerability in Freebsd, classified under Use After Free. CVSS score: 7.8/10. Published 2026-05-21.

How severe is CVE-2026-45251?

High severity. CVSS v3 base score is 7.8 out of 10.

Use After Free in Freebsd

CVE-2026-45251

A file descriptor can be closed while a thread is blocked in a poll(2) or select(2) call waiting for that descriptor. Because the blocked thread does not hold a reference to the underlying object, this closure may result in the object bei…

Vulnerability class: Use-After-Free

EPSS: 0.000 (0.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Affected products

Freebsd — versions 14.3, 15.0, 14.4-RELEASE

Weakness classification (CWE)

CWE-416 — Use After Free

References

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

Frequently asked questions

What is CVE-2026-45251?: CVE-2026-45251 is a high-severity vulnerability in Freebsd, classified under Use After Free. CVSS score: 7.8/10. Published 2026-05-21.
How severe is CVE-2026-45251?: High severity. CVSS v3 base score is 7.8 out of 10.