CVE-2026-18784

o6 open62541 ua_client_highlevel.c UA_Client_readNodeClassAttribute heap-based overflow

MEDIUM
5.3
CVSS Score
Published: August 4, 2026 at 04:30 PM UTC
Updated: October 24, 2026 at 04:10 PM UTC
2 products affected across 2 vendorsOPEN62541OPEN62541

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Severity
MEDIUM5.3
Exploit prediction
EPSS 0.2%
SSVC
PoC

Description

A vulnerability was found in o6 open62541 up to 1.5.5. This issue affects the function UA_Client_readNodeClassAttribute of the file src/client/ua_client_highlevel.c. Performing a manipulation results in heap-based buffer overflow. Attacking locally is a requirement. The exploit has been made public and could be used. The project closed the issue report, stating that this is not the official way to report a security vulnerability.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (6)

VDB EntryTechnical Description
Source: cverecord
https://vuldb.com/vuln/385786
SignaturePermissions Required
Source: cverecord
https://vuldb.com/vuln/385786/cti
Third Party Advisory
Source: cverecord
https://vuldb.com/cve/CVE-2026-18784
Third Party Advisory
Source: cverecord
https://vuldb.com/submit/857012
ExploitIssue Tracking
Source: cverecord
https://github.com/gff-cw/information/issues/11

SSVC — Action Prioritization

SSVCPoCNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.3MEDIUMVulDB
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-122CWE-119

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