---
id: CVE-2026-96959
title: >-
  Allocation of resources without limits or throttling in .NET allows an
  unauthorized attacker to deny service over a network.
summary: >-
  Allocation of resources without limits or throttling 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-770
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: '2026-10-13T20:19:33.620'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-96959'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-96959'
    label: secure@microsoft.com
  - url: 'https://github.com/dotnet/runtime/security/advisories/GHSA-c399-9853-6jmj'
  - url: 'https://github.com/dotnet/announcements/issues/489'
  - url: 'https://github.com/dotnet/runtime/issues/135710'
  - url: 'https://github.com/advisories/GHSA-c399-9853-6jmj'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-96959'
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-96959.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-96959'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2550920'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-96959'
tags:
  - nvd
  - ghsa
  - nuget
  - cve.org
  - csaf
  - vex
  - red-hat
aliases:
  - GHSA-c399-9853-6jmj
ecosystem: nuget
ingestedAt: '2026-10-13T19:43:29.286Z'
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-10-13T19:37:58.924694Z'
epss: 0.00969
epssPercentile: 0.61693
---

## Overview

Allocation of resources without limits or throttling 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-2026-96959)

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-c399-9853-6jmj

## Vendor advisories

- **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 2026-10-23 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-96959.json)