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High, CVSS 7.5

Security Update for the OPC UA .NET Standard Stack

GHSA-qm9f-c3v9-wphv

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (opcfoundation.netstandard.opc.ua 1.05.374.54; opcfoundation.netstandard.opc.ua.core 1.05.374.54), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
7.5 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS
No dated EPSS signal available.
Source description

As published by the source; long descriptions are shortened.

This security update resolves a vulnerability in the OPC UA .NET Standard Stack that enables an unauthorized attacker to trigger a rapid increase in memory consumption.

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 1 · created ·

    Published from ghsa record GHSA-qm9f-c3v9-wphv

Agent brief

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: GHSA-qm9f-c3v9-wphv

Advisory: Security Update for the OPC UA .NET Standard Stack
IDs: GHSA-qm9f-c3v9-wphv
Record: https://patchnext.com/advisories/ghsa-qm9f-c3v9-wphv (revision 1, source checked 26 Oct 2026, 17:00 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 7.5)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: opcfoundation.netstandard.opc.ua 1.05.374.54; opcfoundation.netstandard.opc.ua.core 1.05.374.54. A vendor fix does not mean a deployment is fixed.

## Affected components
- NuGet opcfoundation.netstandard.opc.ua: affected < 1.05.374.54; fixed in 1.05.374.54
- NuGet opcfoundation.netstandard.opc.ua.core: affected < 1.05.374.54; fixed in 1.05.374.54

## Suggested inspection (read-only)
- NuGet opcfoundation.netstandard.opc.ua: check the installed version with your package manager.
- NuGet opcfoundation.netstandard.opc.ua.core: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on opcfoundation.netstandard.opc.ua, opcfoundation.netstandard.opc.ua.core.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-qm9f-c3v9-wphv (GitHub-reviewed advisory GHSA-qm9f-c3v9-wphv lists affected ranges: NuGet opcfoundation.netstandard.opc.ua.core >=0 =0 <1.05.374.54)

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