What is CVE-2026-86509?

CVE-2026-86509 is a critical-severity vulnerability in D-Link Dir-895l, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 9.6/10. Published 2026-09-08.

How severe is CVE-2026-86509?

Critical severity. CVSS v3 base score is 9.6 out of 10.

Buffer overflow in D-Link Dir-895l

CVE-2026-86509

A flaw has been found in D-Link DIR-895L A1_102b07. This impacts the function sendOffer/sendACK of the file udhcpcd/serverpacket.c of the component udhcpcd. This manipulation causes stack-based buffer overflow. The attack can only be done within the local network. The exploit has been published and may be used.

Vulnerability class: Buffer Overflow

CVSS v3 metric

CVSS v3 base score 9.6 (Critical). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H.

Affected products

D-link Dir-895l — versions A1_102b07

Weakness classification (CWE)

References

cna@vuldb.com (exploit)
cna@vuldb.com (third-party-advisory)
cna@vuldb.com (third-party-advisory)
cna@vuldb.com (technical-description, vdb-entry)
cna@vuldb.com (signature, permissions-required)
cna@vuldb.com (product)

Frequently asked questions

What is CVE-2026-86509?: CVE-2026-86509 is a critical-severity vulnerability in D-Link Dir-895l, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 9.6/10. Published 2026-09-08.
How severe is CVE-2026-86509?: Critical severity. CVSS v3 base score is 9.6 out of 10.