Microsoft .NET/Visual Studio up to 10.0.12/11.0.0-rc.1/8.0.4/9.0.20 Signed XML algorithmic complexity

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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6.3$0-$5k1.44

Summaryinfo

A vulnerability, which was classified as problematic, has been found in Microsoft .NET and Visual Studio up to 10.0.12/11.0.0-rc.1/8.0.4/9.0.20. Impacted is an unknown function of the component Signed XML. This manipulation causes algorithmic complexity. This vulnerability is handled as CVE-2026-96958. The attack can be initiated remotely. There is not any exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic was found in Microsoft .NET and Visual Studio up to 10.0.12/11.0.0-rc.1/8.0.4/9.0.20. Affected by this vulnerability is an unknown functionality of the component Signed XML. The manipulation with an unknown input leads to a algorithmic complexity vulnerability. The CWE definition for the vulnerability is CWE-407. An algorithm in a product has an inefficient worst-case computational complexity that may be detrimental to system performance and can be triggered by an attacker, typically using crafted manipulations that ensure that the worst case is being reached. As an impact it is known to affect availability. The summary by CVE is:

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

It is possible to read the advisory at msrc.microsoft.com. This vulnerability is known as CVE-2026-96958 since 09/23/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 10/14/2026). The attack technique deployed by this issue is T1499 according to MITRE ATT&CK.

Upgrading to version 10.0.13, 11.0.0-rc.2, 8.0.5 or 9.0.21 eliminates this vulnerability.

Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.4
VulDB Meta Temp Score: 6.3

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 7.5
CNA Vector (microsoft): 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Algorithmic complexity
CWE: CWE-407 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: .NET/Visual Studio 10.0.13/11.0.0-rc.2/8.0.5/9.0.21

Timelineinfo

09/23/2026 CVE reserved
10/14/2026 +21 days Advisory disclosed
10/14/2026 +0 days VulDB entry created
10/14/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: microsoft.com

Advisory: msrc.microsoft.com
Status: Confirmed

CVE: CVE-2026-96958 (🔒)
GCVE (CVE): GCVE-0-2026-96958
GCVE (VulDB): GCVE-100-418951

Entryinfo

Created: 10/14/2026 03:11
Changes: 10/14/2026 03:11 (29), 10/14/2026 03:12 (35)
Complete: 🔍
Cache ID: 216::103

Be aware that VulDB is the high quality source for vulnerability data.

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