CVE-2026-18790

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 2.2% 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:N/VI:N/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 17:30Z1 MO AGO

Last updated

2026-08-04 19:51Z1 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:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P

Weaknesses

• CWE-119Improper Restriction of Operations within the Bounds of a Memory BufferClass
• CWE-125Out-of-bounds ReadBase

Data version

5.2

Document digest

ec2b1d23baeece5f169572865baaeaac39d40a714222d827732c88345686a828

• vuldb.comVDB-385790 | Systerel S2OPC DeleteMonitoredItemsRequest state_machine.c out-of-boundshttps://vuldb.com/vuln/385790vdb-entrytechnical-description
• vuldb.comVDB-385790 | CTI Indicators (IOB, IOC, IOA)https://vuldb.com/vuln/385790/ctisignaturepermissions-required
• vuldb.comCVE-2026-18790 | CVE Analysis and Reporthttps://vuldb.com/cve/CVE-2026-18790third-party-advisory
• vuldb.comSubmit #857761 | Systerel S2OPC 1.7.3 Out-of-bounds Readhttps://vuldb.com/submit/857761third-party-advisory
• github.comhttps://github.com/gff-cw/information/issues/13issue-tracking
• github.comhttps://github.com/user-attachments/files/28907371/poc.zipexploit