CVE-2026-47302Network attack vector

Application crash via unbounded XML encryption parsing

Published Jul 14, 2026 · Updated Jul 14, 2026

Denial of service in Microsoft .NET XML processing allows remote attackers to crash applications through crafted XML encryption data. The System.Security.Cryptography.Xml and System.Xml paths parse XML encryption structures without bounding resource allocation, causing excessive consumption or an application crash. Exploitation requires a network-facing application to parse attacker-controlled encrypted XML; confidentiality and integrity remain unaffected.

CVSS severity7.5
High
EPSS probability1.03%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Microsoft .NET XML processing allows remote attackers to crash applications through crafted XML encryption data. The System.Security.Cryptography.Xml and System.Xml paths parse XML encryption structures without bounding resource allocation, causing excessive consumption or an application crash. Exploitation requires a network-facing application to parse attacker-controlled encrypted XML; confidentiality and integrity remain unaffected.

The record

CVE
CVE-2026-47302
Published
Jul 14, 2026
Updated
Jul 14, 2026
Vendor
Microsoft
Product
Microsoft .NET Framework 3.5 and 4.8
Classifications
CWE-770, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 14, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.8.0 <2.0.50727.9069 & 3.0.30729.9067 & 4.8.4803.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Microsoft · Microsoft .NET Framework 3.5 and 4.8version=4.8.0 <2.0.50727.9069 & 3.0.30729.9067 & 4.8.4803.0
Microsoft · .NET 9.0version=9.0.0 <9.0.18
Microsoft · .NET 10.0version=10.0.0 <10.0.6
Microsoft · Microsoft Visual Studio 2022 version 17.12version=17.12.0 <17.12.22
Microsoft · Microsoft Visual Studio 2022 version 17.14version=17.14.0 <17.14.36
Microsoft · .NET 8.0version=8.0.0 <8.0.29
Microsoft · Microsoft Visual Studio 2026version=18.0 <18.7.4
Microsoft · Microsoft .NET Frameworkversion=4.7.0 <2.0.50727.9069 & 3.0.30729.9067 & 4.7.4143.0; version=4.7.0 <4.7.4143.0; version=4.8.1 <2.0.50727.9182 & 3.0.30729.9168 & 4.8.9339.0
Microsoft · Microsoft .NET Framework 3.5version=3.5.0 <2.0.50727.8983 & 3.0.30729.8978
Microsoft · Microsoft .NET Framework 4.8version=4.8.0 <4.8.4803.0

Published CVSS scores

7.5Microsoft CorporationCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
T1499.004Application or System Exploitation DoS

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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