What is CVE-2026-57589?

CVE-2026-57589 is a high-severity vulnerability in Openbsd, classified under Use After Free. CVSS score: 7.4/10. Published 2026-06-25.

How severe is CVE-2026-57589?

High severity. CVSS v3 base score is 7.4 out of 10.

Use After Free in Openbsd

CVE-2026-57589

sys/kern/sysv_sem.c in OpenBSD through 7.9 has a use-after-free allowing local privilege escalation to root. This is a context switch use-after-free after tsleep in sys_semget().

Vulnerability class: Use-After-Free

EPSS: 0.001 (2.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.4 (High). Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Openbsd — versions 0

Weakness classification (CWE)

CWE-416 — Use After Free

References

cve@mitre.org
cve@mitre.org

Frequently asked questions

What is CVE-2026-57589?: CVE-2026-57589 is a high-severity vulnerability in Openbsd, classified under Use After Free. CVSS score: 7.4/10. Published 2026-06-25.
How severe is CVE-2026-57589?: High severity. CVSS v3 base score is 7.4 out of 10.