CVE-2026-18784

Exploitation

Public exploit code exists. CISA's assessment records a public proof of concept. That is not a report of exploitation in the wild.

SSVC decision

• ExploitationpocPublic proof-of-concept exploit code exists. Not a report of exploitation in the wild.
• AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
• Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.12% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 2.5% of scored records. A rank, not a probability.

NVD base score

1.9 (CVSS v4.0), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

NVD analysis status

Deferred. NVD last modified this record on 2026-08-12.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2026-08-04 16:30Z1 MO AGO

Last updated

2026-08-05 14:55Z1 MO AGO

Reserved

2026-08-04

Assigning CNA

VulDB

Record state

PUBLISHED

Severity

Medium (CVSS 4.8)

CNA CVSS vector

CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P

Weaknesses

• CWE-119Improper Restriction of Operations within the Bounds of a Memory BufferClass
• CWE-122Heap-based Buffer OverflowVariant

Data version

5.2

Document digest

df624d2c7ade74ebf03851064ca6e5999a0866acb44dfbf3b2e497cac949cea0

• vuldb.comVDB-385786 | o6 open62541 ua_client_highlevel.c UA_Client_readNodeClassAttribute heap-based overflowhttps://vuldb.com/vuln/385786vdb-entrytechnical-description
• vuldb.comVDB-385786 | CTI Indicators (IOB, IOC, IOA)https://vuldb.com/vuln/385786/ctisignaturepermissions-required
• vuldb.comCVE-2026-18784 | CVE Analysis and Reporthttps://vuldb.com/cve/CVE-2026-18784third-party-advisory
• vuldb.comSubmit #857012 | open62541 Project open62541 master (commit ca356b088ada7dee824d1b4acd07c1ff07ce242b) Heap-based Buffer Overflow (Out-of-Bounds Read)https://vuldb.com/submit/857012third-party-advisory
• github.comhttps://github.com/open62541/open62541/issues/8139issue-tracking
• github.comhttps://github.com/gff-cw/information/issues/11exploitissue-tracking