What is CVE-2026-45259?

CVE-2026-45259 is a medium-severity vulnerability in Freebsd, classified under Incorrect Privilege Assignment. CVSS score: 6.5/10. Published 2026-06-27.

How severe is CVE-2026-45259?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Privilege escalation in Freebsd

CVE-2026-45259

sigqueue(2) was marked as permitted in capability mode with the introduction of Capsicum in 2011, but the implementation of kern_sigqueue did not include a capability mode check restricting signal delivery to the calling process's own PID…

EPSS: 0.001 (0.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H.

Affected products

Freebsd — versions 14.3, 15.0, 14.4-RELEASE

Weakness classification (CWE)

CWE-266 — Incorrect Privilege Assignment

References

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

Frequently asked questions

What is CVE-2026-45259?: CVE-2026-45259 is a medium-severity vulnerability in Freebsd, classified under Incorrect Privilege Assignment. CVSS score: 6.5/10. Published 2026-06-27.
How severe is CVE-2026-45259?: Medium severity. CVSS v3 base score is 6.5 out of 10.