What is CVE-2026-58096?

CVE-2026-58096 is a critical-severity vulnerability in FreeBSD, classified under Improper Handling of Length Parameter Inconsistency. CVSS score: 9.8/10. Published 2026-08-26.

How severe is CVE-2026-58096?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Buffer overflow in FreeBSD

CVE-2026-58096

LcpDecodeConfig() did not validate the length of received endpoint discriminator options against the minimum required by RFC 1717. Undersized options would trigger an out-of-bounds write. A malicious PPP peer can exploit CVE-2026-58095 and CVE-2026-58096 to crash ppp(8) or potentially execute arbitrary code as root.

EPSS: 0.003 (20.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Freebsd

Weakness classification (CWE)

CWE-130 — Improper Handling of Length Parameter Inconsistency
CWE-787 — Out-of-bounds Write

References

secteam@freebsd.org (vendor-advisory)

Frequently asked questions

What is CVE-2026-58096?: CVE-2026-58096 is a critical-severity vulnerability in FreeBSD, classified under Improper Handling of Length Parameter Inconsistency. CVSS score: 9.8/10. Published 2026-08-26.
How severe is CVE-2026-58096?: Critical severity. CVSS v3 base score is 9.8 out of 10.