EUVD-2026-44394Published

.NET Tampering Vulnerability

Collected exploitation and prediction evidence

CISA KEV is observed exploitation evidence. FIRST EPSS is a dated prediction of exploitation in the next 30 days. Missing scores are unknown. This collector requests predictions only for explicit CVE aliases in the public NuGet archive; Microsoft release views retain their existing prediction scope.

CVE-2026-50526

Exact risk observation. Current source statements above are a separate evidence layer. Latest risk evidence.

No KEV entry is attached to this observation; this is not evidence that exploitation is absent.

FIRST EPSS: 0.22 % · percentile 12.96 % · scored 28 Oct 2026. Retained older prediction.

Observed 28 Oct 2026 19:55:37 UTC · Complete immutable risk JSON

cve-program · CVE-2026-50526

Published

Improper link resolution before file access ('link following') in .NET allows an authorized attacker to perform tampering locally.

Source published: 14 Jul 2026 19:29:54 UTC
Source modified: 1 Nov 2026 17:35:39 UTC
Observed here: 1 Nov 2026 18:57:17 UTC
Source terms: CVE Program Terms of Use

Original source record · Cite this exact observation · Complete original publisher JSON

This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: cve-program · CVE Program Terms of Use. Source text is retained; field grouping and change labels are provided by ChangeIntel.

CVSS 3.1 · 7.0 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

euvd · EUVD-2026-44394

Published

Improper link resolution before file access ('link following') in .NET allows an authorized attacker to perform tampering locally.

EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON.

Original publisher date fields

datePublished: Jul 14, 2026, 7:29:54 PM

dateUpdated: Nov 1, 2026, 5:35:39 PM

20 related source bulletins · separate from aliases

RHSA-2026:42145: Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update

CVE-2026-47300 · CVE-2026-47302 · CVE-2026-47303 · CVE-2026-47304 · CVE-2026-50524 · CVE-2026-50525 · CVE-2026-50526 · CVE-2026-50527 · CVE-2026-50528 · CVE-2026-50646 · CVE-2026-50648 · CVE-2026-50649 · CVE-2026-50650 · CVE-2026-50651 · CVE-2026-50659 · CVE-2026-56170 · CVE-2026-57108

RHSA-2026:58569: Red Hat Security Advisory: .NET 8.0 security, bug fix, and enhancement update

RHSA-2026:41901: Red Hat Security Advisory: .NET 8.0 security, bug fix, and enhancement update

RHSA-2026:41898: Red Hat Security Advisory: .NET 10.0 security, bug fix, and enhancement update

NCSC-2026-0235: Kwetsbaarheden verholpen in Microsoft Developer Tools

CVE-2026-47300 · CVE-2026-47302 · CVE-2026-47303 · CVE-2026-50524 · CVE-2026-56170 · CVE-2026-47304 · CVE-2026-50525 · CVE-2026-50526 · CVE-2026-50527 · CVE-2026-50528 · CVE-2026-50648 · CVE-2026-50651 · CVE-2026-50659 · CVE-2026-57108 · CVE-2026-50646 · CVE-2026-50649 · CVE-2026-50650 · CVE-2026-50506 · CVE-2026-45646 · CVE-2026-47282 · CVE-2026-45496 · CVE-2026-50520 · CVE-2026-41109 · CVE-2026-57101 · CVE-2026-57102 · CVE-2026-47305

RHSA-2026:41899: Red Hat Security Advisory: .NET 9.0 security, bug fix, and enhancement update

msrc_CVE-2026-50526: .NET Tampering Vulnerability

CVE-2026-50526

RHSA-2026:41893: Red Hat Security Advisory: .NET 8.0 security, bug fix, and enhancement update

RHSA-2026:58566: Red Hat Security Advisory: .NET 8.0 security, bug fix, and enhancement update

WID-SEC-W-2026-2324: Microsoft DeveloperTools: Mehrere Schwachstellen

CVE-2026-45496 · CVE-2026-45646 · CVE-2026-47282 · CVE-2026-47300 · CVE-2026-47302 · CVE-2026-47303 · CVE-2026-47304 · CVE-2026-47305 · CVE-2026-50506 · CVE-2026-50520 · CVE-2026-50524 · CVE-2026-50525 · CVE-2026-50526 · CVE-2026-50527 · CVE-2026-50528 · CVE-2026-50646 · CVE-2026-50648 · CVE-2026-50649 · CVE-2026-50650 · CVE-2026-50651 · CVE-2026-50659 · CVE-2026-56170 · CVE-2026-57101 · CVE-2026-57102 · CVE-2026-57108

RHSA-2026:41894: Red Hat Security Advisory: .NET 8.0 security, bug fix, and enhancement update

RHSA-2026:58567: Red Hat Security Advisory: .NET 9.0 security, bug fix, and enhancement update

RHSA-2026:41897: Red Hat Security Advisory: .NET 10.0 security, bug fix, and enhancement update

RHSA-2026:26638: Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update

CVE-2026-45491 · CVE-2026-45591 · CVE-2026-45736 · CVE-2026-47300 · CVE-2026-47302 · CVE-2026-47303 · CVE-2026-50524 · CVE-2026-50525 · CVE-2026-50526 · CVE-2026-50527 · CVE-2026-50528 · CVE-2026-50648 · CVE-2026-50651 · CVE-2026-50659 · CVE-2026-56170 · CVE-2026-57108

RHSA-2026:41895: Red Hat Security Advisory: .NET 9.0 security, bug fix, and enhancement update

RHSA-2026:41900: Red Hat Security Advisory: .NET 10.0 security, bug fix, and enhancement update

RHSA-2026:41896: Red Hat Security Advisory: .NET 9.0 security, bug fix, and enhancement update

RHSA-2026:58568: Red Hat Security Advisory: .NET 8.0 security, bug fix, and enhancement update

RHSA-2026:27171: Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update

CVE-2026-45736 · CVE-2026-47302 · CVE-2026-50524 · CVE-2026-50525 · CVE-2026-50526 · CVE-2026-50527 · CVE-2026-50528 · CVE-2026-50646 · CVE-2026-50648 · CVE-2026-50649 · CVE-2026-50650 · CVE-2026-50651 · CVE-2026-57108

RHSA-2026:58570: Red Hat Security Advisory: .NET 9.0 security, bug fix, and enhancement update

Source published: Jul 14, 2026, 7:29:54 PM (timezone not stated)
Source modified: Nov 1, 2026, 5:35:39 PM (timezone not stated)
Observed here: 7 Nov 2026 11:34:07 UTC
Source terms: ENISA EUVD · source terms and attribution apply

Original source record · Cite this exact observation · Complete original publisher JSON

This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: euvd · ENISA EUVD · source terms and attribution apply. Source text is retained; field grouping and change labels are provided by ChangeIntel.

EUVD CVSS 3.1 · 7.0 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

nvd · CVE-2026-50526

Published

Improper link resolution before file access ('link following') in .NET allows an authorized attacker to perform tampering locally.

NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON.

Source analysis status: Analyzed

Weakness classifications: CWE-59 · CWE-345

Original publisher date fields

published: 2026-07-14T20:17:37.240

lastModified: 2026-10-28T20:17:53.770

6 source CPE criteria · context only

cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*
cpe:2.3:o:apple:macos:-:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:visual_studio_2022:*:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:visual_studio_2026:*:*:*:*:*:*:*:*

The original JSON retains the logical configuration operators, exclusions and version bounds.

Source published: 14 Jul 2026 20:17:37 UTC
Source modified: 28 Oct 2026 20:17:53 UTC
Observed here: 29 Oct 2026 14:14:23 UTC
Source terms: NIST NVD usage terms; underlying source attribution retained

Original source record · Cite this exact observation · Complete original publisher JSON

This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: nvd · NIST NVD usage terms; underlying source attribution retained. Source text is retained; field grouping and change labels are provided by ChangeIntel.

CVSS 3.1 · [email protected] · Secondary · 7.0 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS 3.1 · [email protected] · Primary · 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

osv · GHSA-55jh-fwmh-39m4

Published

## Executive summary Microsoft is releasing this security advisory to provide information about a vulnerability in .NET SDK (Microsoft.NET.Build.Containers). This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. A tampering vulnerability exists in the .NET SDK (.NET 8, .NET 9, and .NET 10) container image build process which could allow a local attacker to inject resources that could be incorporated into container images built by other users on the same machine. ## Announcement Announcement for this issue can be found at https://github.com/dotnet/announcements/issues/**TBD** ## CVSS Details - **Version:** 3.1 - **Severity:** High - **Score:** 7.0 - **Vector:** `CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H` - **Weakness:** CWE-59 (Improper Link Resolution Before File Access ('Link Following')) ## Affected Platforms - **Platforms:** All - **Architectures:** All ## <a name="affected-packages"></a>Affected Packages The vulnerability affects any Microsoft .NET project if it uses any of affected package versions listed below ### <a name=".NET 10.0"></a>.NET 10.0 Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- [Microsoft.NET.Build.Containers](https://www.nuget.org/packages/Microsoft.NET.Build.Containers) | >= 10.0.0, <= 10.0.9 | 10.0.10 ### <a name=".NET 9.0"></a>.NET 9.0 Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- [Microsoft.NET.Build.Containers](https://www.nuget.org/packages/Microsoft.NET.Build.Containers) | >= 9.0.0, <= 9.0.17 | 9.0.18 ### <a name=".NET 8.0"></a>.NET 8.0 Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- [Microsoft.NET.Build.Containers](https://www.nuget.org/packages/Microsoft.NET.Build.Containers) | >= 8.0.0, <= 8.0.28 | 8.0.29 ## Advisory FAQ ### <a name="how-affected"></a>How do I know if I am affected? If using a package listed in [affected packages](#affected-packages), you're exposed to the vulnerability. ### <a name="how-fix"></a>How do I fix the issue? 1. To fix the issue please install the latest version of .NET. If you have installed one or more .NET SDKs through Visual Studio, Visual Studio will prompt you to update Visual Studio, which will also update your .NET SDKs. 2. If your application references the vulnerable nuget package, update the package reference to the patched version. You can list the versions you have installed by running the `dotnet --info` command. Once you have installed the updated runtime or SDK, restart your apps for the update to take effect. Additionally, if you've deployed [self-contained applications](https://docs.microsoft.com/dotnet/core/deploying/#self-contained-deployments-scd) targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed. ## Other Information ### Reporting Security Issues If you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the [MSRC Researcher Portal](https://msrc.microsoft.com/report/vulnerability/new). Further information can be found in the MSRC [Report an Issue FAQ](https://www.microsoft.com/msrc/faqs-report-an-issue). Security reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty. ### Support You can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue. ### Disclaimer The information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. ### External Links [CVE-2026-50526]( https://www.cve.org/CVERecord?id=CVE-2026-50526) ### Acknowledgements **Anonymous, Siwei Li with Microsoft** ### Revisions V1.0 (July 14, 2026): Advisory published.

Source published: 21 Jul 2026 16:14:37 UTC
Source modified: 27 Jul 2026 09:11:24 UTC
Observed here: 23 Oct 2026 16:01:25 UTC
Source terms: GitHub Advisory Database · CC-BY-4.0

Original source record · Cite this exact observation · Complete original publisher JSON

This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: osv · GitHub Advisory Database · CC-BY-4.0. Source text is retained; field grouping and change labels are provided by ChangeIntel.

CVSS_V3 · CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Publisher rating · HIGH