Security Update for the OPC UA .NET Standard Stack

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

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

EPSS

• CVE-2024-45526: 0.50% estimated exploitation activity in the next 30 days; percentile 43.14 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

This security update resolves a vulnerability in the OPC UA .NET Standard Stack that allows an unauthorized attacker to trigger a gradual degradation in performance.

Published by the source

18 Oct 2024, 20:05 UTC

Last modified by the source

22 Oct 2024, 21:44 UTC

Source last checked

26 Oct 2026, 17:00 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-7vfh-cqpc-4267

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# Patch Next advisory brief: CVE-2024-45526

Advisory: Security Update for the OPC UA .NET Standard Stack
IDs: CVE-2024-45526, GHSA-7vfh-cqpc-4267
Record: https://patchnext.com/advisories/cve-2024-45526 (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: Medium (CVSS 5.3)
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 1.5.374.118; opcfoundation.netstandard.opc.ua.core 1.5.374.118. A vendor fix does not mean a deployment is fixed.

## Affected components
- NuGet opcfoundation.netstandard.opc.ua: affected < 1.5.374.118; fixed in 1.5.374.118
- NuGet opcfoundation.netstandard.opc.ua.core: affected < 1.5.374.118; fixed in 1.5.374.118

## 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-7vfh-cqpc-4267 (GitHub-reviewed advisory GHSA-7vfh-cqpc-4267 lists affected ranges: NuGet opcfoundation.netstandard.opc.ua >=0 =0 <1.5.374.118)

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