Vulnerability-Lookup

CVE-2026-84008 (GCVE-0-2026-84008)

Vulnerability from cvelistv5 – Published: 2026-10-13 19:01 – Updated: 2026-10-14 17:58

Title

.NET Denial of Service Vulnerability

Summary

Inefficient algorithmic complexity in .NET allows an unauthorized attacker to deny service over a network.

Severity

7.5 (High)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-10-13 22:07 UTC

CWE

CWE-407 - Inefficient Algorithmic Complexity

Assigner

microsoft CNA under the mitre root

CNA scorecard B 82/100 over 3924 records in the last 180 days details

References

1 reference

URL	Tags
https://msrc.microsoft.com/update-guide/vulnerabi…	vendor-advisorypatch

Impacted products

11 products

Vendor	Product	Version	CPE status
Microsoft	Microsoft .NET Framework 3.5	Affected: 3.5.0 , < 2.0.50727.9188 AND 3.0.30729.9171 (custom)	guessed
Microsoft	Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2	Affected: 3.0.0.0 , < 2.0.50727.9073 AND 3.0.30729.9070 AND 4.7.4150.0 (custom)	guessed
Microsoft	Microsoft .NET Framework 3.5 AND 4.7.2	Affected: 4.7.0 , < 2.0.50727.9073 AND 3.0.30729.9070 AND 4.7.4150.0 (custom)	guessed
Microsoft	Microsoft .NET Framework 3.5 AND 4.8	Affected: 4.8.0 , < 2.0.50727.9073 AND 3.0.30729.9070 AND 4.8.4811.0 (custom)	guessed
Microsoft	Microsoft .NET Framework 3.5 AND 4.8.1	Affected: 4.8.1 , < 2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.9363.0 (custom)	guessed
Microsoft	Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2	Affected: 4.7.0 , < 4.7.4150.0 (custom)	guessed
Microsoft	Microsoft .NET Framework 4.8	Affected: 4.8.0 , < 4.8.4811.0 (custom)	guessed
Microsoft	Microsoft .NET Framework 4.8.1	Affected: 4.8.0.0 , < 4.8.9363.0 (custom)	guessed
Microsoft	Microsoft Visual Studio 2022 version 17.14	Affected: 17.14.0 , < 17.14.42 (custom)	guessed
Microsoft	Microsoft Visual Studio 2026 version 18.10	Affected: 18.10.0 , < 18.10.4 (custom)	guessed
Microsoft	System.Security.Cryptography.Pkcs	Affected: 10.0.0 , < 10.0.13 (custom)	guessed

Date Public

2026-10-13 14:00

Show details on NVD website

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FKIE_CVE-2026-84008

Vulnerability from fkie_nvd - Published: 2026-10-13 19:20 - Updated: 2026-10-13 23:18

Severity

7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Summary

Inefficient algorithmic complexity in .NET allows an unauthorized attacker to deny service over a network.

References

	URL	Tags
	secure@microsoft.com	https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-84008

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
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}

GHSA-846F-F764-76MX

Vulnerability from github – Published: 2026-10-13 20:03 – Updated: 2026-10-13 20:03

Summary

Microsoft Security Advisory CVE-2026-84008 - .NET Denial of Service Vulnerability

Details

Executive summary

Microsoft is releasing this security advisory to provide information about a vulnerability in System.Security.Cryptography.Pkcs. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability.

SignedCms.CheckSignature can repeatedly reparse attacker-controlled X.509 data, causing unauthenticated quadratic CPU exhaustion.

Announcement

Announcement for this issue can be found at https://github.com/dotnet/announcements/issues/468

CVSS Details

Version: 3.1
Severity: High
Score: 7.5
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness: CWE-407 (Inefficient Algorithmic Complexity)

Affected Platforms

Platforms: Windows, Linux, macOS
Architectures: All

Affected Packages

The vulnerability affects Microsoft .NET projects that use an affected package version listed below.

Package name	Affected version	Patched version
System.Security.Cryptography.Pkcs	>= 10.0.0, <= 10.0.12	10.0.13
System.Security.Cryptography.Pkcs	>= 11.0.0-preview.1, <= 11.0.0-rc.1	11.0.0-rc.2
System.Security.Cryptography.Pkcs	>= 8.0.0, <= 8.0.1	8.0.2
System.Security.Cryptography.Pkcs	>= 9.0.0, <= 9.0.20	9.0.21

Advisory FAQ

How do I know if I am affected?

If using a package listed in affected packages, you're exposed to the vulnerability.

How do I fix the issue?

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.
If your application references the vulnerable 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 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. Further information can be found in the MSRC Report an Issue FAQ.

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-2026-84008

Acknowledgements

Dr.-Ing Ashar Javed (@soaj1664ashar)

Revisions

V1.0 (10/13/2026): Advisory published.

Severity

7.5 (High)


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

Show details on source website

JSON

To clipboard

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    "severity": "HIGH"
  },
  "details": "## Executive summary\n\nMicrosoft is releasing this security advisory to provide information about a vulnerability in System.Security.Cryptography.Pkcs. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability.\n\n`SignedCms.CheckSignature` can repeatedly reparse attacker-controlled X.509 data, causing unauthenticated quadratic CPU exhaustion.\n\n## Announcement\n\nAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/468\n\n## CVSS Details\n\n- **Version:** 3.1\n- **Severity:** High\n- **Score:** 7.5\n- **Vector:** `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`\n\n- **Weakness:** CWE-407 (Inefficient Algorithmic Complexity)\n## Affected Platforms\n\n- **Platforms:** Windows, Linux, macOS\n- **Architectures:** All\n\n## \u003ca name=\"affected-packages\"\u003e\u003c/a\u003eAffected Packages\n\nThe vulnerability affects Microsoft .NET projects that use an affected package version listed below.\n\nPackage name | Affected version | Patched version\n------------ | ---------------- | ---------------\n[System.Security.Cryptography.Pkcs](https://www.nuget.org/packages/System.Security.Cryptography.Pkcs) | \u003e= 10.0.0, \u003c= 10.0.12 | 10.0.13\n[System.Security.Cryptography.Pkcs](https://www.nuget.org/packages/System.Security.Cryptography.Pkcs) | \u003e= 11.0.0-preview.1, \u003c= 11.0.0-rc.1 | 11.0.0-rc.2\n[System.Security.Cryptography.Pkcs](https://www.nuget.org/packages/System.Security.Cryptography.Pkcs) | \u003e= 8.0.0, \u003c= 8.0.1 | 8.0.2\n[System.Security.Cryptography.Pkcs](https://www.nuget.org/packages/System.Security.Cryptography.Pkcs) | \u003e= 9.0.0, \u003c= 9.0.20 | 9.0.21\n\n## Advisory FAQ\n\n### \u003ca name=\"how-affected\"\u003e\u003c/a\u003eHow do I know if I am affected?\n\nIf using a package listed in [affected packages](#affected-packages), you\u0027re exposed to the vulnerability.\n\n### \u003ca name=\"how-fix\"\u003e\u003c/a\u003eHow do I fix the issue?\n\n1. 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.\n2. If your application references the vulnerable package, update the package reference to the patched version. You can list the versions you have installed by running the `dotnet --info` command.\n\nOnce you have installed the updated runtime or SDK, restart your apps for the update to take effect.\n\nAdditionally, if you\u0027ve 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.\n\n## Other Information\n\n### Reporting Security Issues\n\nIf 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).\n\nSecurity 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.\n\n### Support\n\nYou 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.\n\n### Disclaimer\n\nThe 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.\n\n### External Links\n\n[CVE-2026-84008](https://www.cve.org/CVERecord?id=CVE-2026-84008)\n\n### Acknowledgements\n\n- Dr.-Ing Ashar Javed (@soaj1664ashar)\n\n### Revisions\n\nV1.0 (10/13/2026): Advisory published.",
  "id": "GHSA-846f-f764-76mx",
  "modified": "2026-10-13T20:03:30Z",
  "published": "2026-10-13T20:03:30Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/dotnet/runtime/security/advisories/GHSA-846f-f764-76mx"
    },
    {
      "type": "WEB",
      "url": "https://github.com/dotnet/announcements/issues/468"
    },
    {
      "type": "WEB",
      "url": "https://github.com/dotnet/runtime/issues/135703"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/dotnet/runtime"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Microsoft Security Advisory CVE-2026-84008 - .NET Denial of Service Vulnerability"
}

NCSC-2026-0426

Vulnerability from csaf_ncscnl - Published: 2026-10-13 18:56 - Updated: 2026-10-13 18:56

Summary

Kwetsbaarheden verholpen in Microsoft Developer Tools

Scope

62 vulnerabilities in this advisory, including CVE-2026-84008.

CVE-2026-84008

Known affected: 36 products

Open the full advisory

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-84008 (GCVE-0-2026-84008)

FKIE_CVE-2026-84008

GHSA-846F-F764-76MX

Executive summary

Announcement

CVSS Details

Affected Platforms

Affected Packages

Advisory FAQ

How do I know if I am affected?

How do I fix the issue?

Other Information

Reporting Security Issues

Support

Disclaimer

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Acknowledgements

Revisions

NCSC-2026-0426

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