---
id: CVE-2026-84008
title: >-
  Inefficient algorithmic complexity in .NET allows an unauthorized attacker to
  deny service over a network.
summary: >-
  Inefficient algorithmic complexity in .NET allows an unauthorized attacker to
  deny service over a network.
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-407
  - CWE-1333
vendor: System
product: System.Security.Cryptography.Pkcs
affected:
  - 'System.Security.Cryptography.Pkcs >= 10.0.0, <= 10.0.12'
  - 'System.Security.Cryptography.Pkcs >= 11.0.0-preview.1, <= 11.0.0-rc.1'
  - 'System.Security.Cryptography.Pkcs >= 8.0.0, <= 8.0.1'
  - 'System.Security.Cryptography.Pkcs >= 9.0.0, <= 9.0.20'
patched:
  - System.Security.Cryptography.Pkcs 10.0.13
  - System.Security.Cryptography.Pkcs 11.0.0-rc.2
  - System.Security.Cryptography.Pkcs 8.0.2
  - System.Security.Cryptography.Pkcs 9.0.21
published: '2026-10-13'
updated: '2026-10-13'
sourceUpdated: '2026-10-13T23:18:40.710'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-84008'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-84008'
    label: secure@microsoft.com
  - url: 'https://github.com/dotnet/runtime/security/advisories/GHSA-846f-f764-76mx'
  - url: 'https://github.com/dotnet/announcements/issues/468'
  - url: 'https://github.com/dotnet/runtime/issues/135703'
  - url: 'https://github.com/advisories/GHSA-846f-f764-76mx'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-84008'
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-84008.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-84008'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2550849'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-84008'
  - url: 'https://access.redhat.com/errata/RHSA-2026:84693'
tags:
  - nvd
  - ghsa
  - nuget
  - cve.org
  - csaf
  - vex
  - red-hat
aliases:
  - GHSA-846f-f764-76mx
ecosystem: nuget
ingestedAt: '2026-10-13T19:43:29.146Z'
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-10-13T22:07:10.813689Z'
epss: 0.00991
epssPercentile: 0.62356
---

## Overview

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

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Package advisory (CVE-2026-84008)

Affected packages:

- `System.Security.Cryptography.Pkcs >= 10.0.0, <= 10.0.12`
- `System.Security.Cryptography.Pkcs >= 11.0.0-preview.1, <= 11.0.0-rc.1`
- `System.Security.Cryptography.Pkcs >= 8.0.0, <= 8.0.1`
- `System.Security.Cryptography.Pkcs >= 9.0.0, <= 9.0.20`

Patched in:

- `System.Security.Cryptography.Pkcs 10.0.13`
- `System.Security.Cryptography.Pkcs 11.0.0-rc.2`
- `System.Security.Cryptography.Pkcs 8.0.2`
- `System.Security.Cryptography.Pkcs 9.0.21`

Source: https://github.com/advisories/GHSA-846f-f764-76mx

## Vendor advisories

- **RHSA-2026:84693** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-10-19 · [advisory](https://access.redhat.com/errata/RHSA-2026:84693)
- **Red Hat VEX** · Important · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat Hardened Images · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat Hardened Images · updated 2026-10-24 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-84008.json)