What is CVE-2026-67858?

CVE-2026-67858 is a high-severity vulnerability in N/a, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 7.5/10. Published 2026-08-04.

How severe is CVE-2026-67858?

High severity. CVSS v3 base score is 7.5 out of 10.

Buffer overflow in N/a

CVE-2026-67858

Buffer Overflow vulnerability exists in open62541 1.5.5 when the Local Discovery Server (LDS) is built with multicast discovery enabled through the MDNSD backend. An unauthenticated remote attacker can send a RegisterServer or RegisterServer2 request containing many unique discoveryUrls. This allows remote attackers to cause a denial of service.

Vulnerability class: Buffer Overflow

EPSS: 0.005 (40.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

N/a — versions n/a

Weakness classification (CWE)

CWE-120 — Buffer Copy without Checking Size of Input (Classic Buffer Overflow)

References

Frequently asked questions

What is CVE-2026-67858?: CVE-2026-67858 is a high-severity vulnerability in N/a, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 7.5/10. Published 2026-08-04.
How severe is CVE-2026-67858?: High severity. CVSS v3 base score is 7.5 out of 10.