Buffer overflow in Freebsd

CVE-2026-39457

When exchanging data over a socket, libnv uses select(2) to wait for data to arrive. However, it does not verify whether the provided socket descriptor fits in select(2)'s file descriptor set size limit of FD_SETSIZE (1024). An attacker…

Vulnerability class: Buffer Overflow

EPSS: 0.000 (1.2th 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, 13.5, 15.0

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-39457?
CVE-2026-39457 is a high-severity vulnerability in Freebsd, classified under Stack-based Buffer Overflow. CVSS score: 7.8/10. Published 2026-04-30.
How severe is CVE-2026-39457?
High severity. CVSS v3 base score is 7.8 out of 10.