CVE-2026-67858

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-67858
StatePUBLISHED
Assignermitre
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-04 22:17:16 UTC
Updated2026-08-05 15:17:06 UTC
DescriptionBuffer 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.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.004870000 probability, percentile 0.393820000 (date 2026-08-07)

Problem Types: CWE-120 | n/a | CWE-120 CWE-120 Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1CNADECLARED7.5HIGHCVSS:3.1/AC:L/AV:N/A:H/C:N/I:N/PR:N/S:U/UI:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Na N/a affected n/a Not specified

References

ReferenceSourceLinkTags
github.com/open62541/open62541/tree/master/examples/discovery [email protected] github.com
github.com/open62541/open62541/blob/master/doc/building.rst [email protected] github.com
github.com/open62541/open62541/issues/8094 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
github.com/open62541/open62541/blob/master/src/server/ua_discovery_mdns.c [email protected] github.com
github.com/open62541/open62541/blob/master/src/server/ua_services_discov... [email protected] github.com
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