What is CVE-2026-39461?

CVE-2026-39461 is a high-severity vulnerability in Freebsd, classified under Stack-based Buffer Overflow. CVSS score: 8.8/10. Published 2026-05-21.

How severe is CVE-2026-39461?

High severity. CVSS v3 base score is 8.8 out of 10.

Buffer overflow in Freebsd

CVE-2026-39461

libcasper(3) communicates with helper processes via UNIX domain sockets, and uses the select(2) system call to wait for data to become available. However, it does not verify that its socket descriptor fits within select(2)'s descriptor se…

Vulnerability class: Buffer Overflow

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

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.

Affected products

Freebsd — versions 14.3, 15.0, 14.4-RELEASE

Weakness classification (CWE)

CWE-121 — Stack-based Buffer Overflow

References

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

Frequently asked questions

What is CVE-2026-39461?: CVE-2026-39461 is a high-severity vulnerability in Freebsd, classified under Stack-based Buffer Overflow. CVSS score: 8.8/10. Published 2026-05-21.
How severe is CVE-2026-39461?: High severity. CVSS v3 base score is 8.8 out of 10.