---
id: CVE-2026-96958
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
vendor: System
product: System.Security.Cryptography.Xml
affected:
  - 'System.Security.Cryptography.Xml >= 10.0.0, <= 10.0.12'
  - 'System.Security.Cryptography.Xml >= 11.0.0-preview.1, <= 11.0.0-rc.1'
  - 'System.Security.Cryptography.Xml >= 8.0.0, <= 8.0.4'
  - 'System.Security.Cryptography.Xml >= 9.0.0, <= 9.0.20'
patched:
  - System.Security.Cryptography.Xml 10.0.13
  - System.Security.Cryptography.Xml 11.0.0-rc.2
  - System.Security.Cryptography.Xml 8.0.5
  - System.Security.Cryptography.Xml 9.0.21
published: '2026-10-13'
updated: '2026-10-13'
sourceUpdated: '2026-10-13T20:19:33.493'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-96958'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-96958'
    label: secure@microsoft.com
  - url: 'https://github.com/dotnet/runtime/security/advisories/GHSA-r955-8q5j-3h83'
  - url: 'https://github.com/dotnet/announcements/issues/488'
  - url: 'https://github.com/dotnet/runtime/issues/135709'
  - url: 'https://github.com/advisories/GHSA-r955-8q5j-3h83'
tags:
  - nvd
  - ghsa
  - nuget
aliases:
  - GHSA-r955-8q5j-3h83
ecosystem: nuget
ingestedAt: '2026-10-13T19:43:29.286Z'
---

## 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-2026-96958)

Affected packages:

- `System.Security.Cryptography.Xml >= 10.0.0, <= 10.0.12`
- `System.Security.Cryptography.Xml >= 11.0.0-preview.1, <= 11.0.0-rc.1`
- `System.Security.Cryptography.Xml >= 8.0.0, <= 8.0.4`
- `System.Security.Cryptography.Xml >= 9.0.0, <= 9.0.20`

Patched in:

- `System.Security.Cryptography.Xml 10.0.13`
- `System.Security.Cryptography.Xml 11.0.0-rc.2`
- `System.Security.Cryptography.Xml 8.0.5`
- `System.Security.Cryptography.Xml 9.0.21`

Source: https://github.com/advisories/GHSA-r955-8q5j-3h83