High severity · published Oct 13, 2026
CVE-2026-96958
.NET Denial of Service Vulnerability
7.5
CVSS
1.2%
EPSS
No
On KEV
Description
Inefficient algorithmic complexity in .NET allows an unauthorized attacker to deny service over a network.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.2% · higher than 68% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MN
Microsoft .NET Framework 3.5 · Microsoft
3.5.0 before 2.0.50727.9188 AND 3.0.30729.9171 · source: vendor
MN
Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 · Microsoft
3.0.0.0 before 2.0.50727.8987 AND 3.0.30729.8982 AND 4.7.4150.0 · source: vendor
MN
Microsoft .NET Framework 3.5 AND 4.7.2 · Microsoft
4.7.0 before 2.0.50727.9073 AND 3.0.30729.9070 AND 4.7.4150.0 · source: vendor
MN
Microsoft .NET Framework 3.5 AND 4.8 · Microsoft
4.8.0 before 2.0.50727.9073 AND 3.0.30729.9070 AND 4.8.4811.0 · source: vendor
MN
Microsoft .NET Framework 3.5 AND 4.8.1 · Microsoft
4.8.1 before 2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.9363.0 · source: vendor
MN
Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 · Microsoft
4.7.0 before 4.7.4150.0 · source: vendor
MN
Microsoft .NET Framework 4.8 · Microsoft
4.8.0 before 4.8.4811.0 · source: vendor
MN
Microsoft .NET Framework 4.8.1 · Microsoft
4.8.0.0 before 4.8.9363.0 · source: vendor
SY
System.Security.Cryptography.Xml · Microsoft
10.0.0 before 10.0.13 · source: vendor
NE
.net · Microsoft
8.0.0 before 8.0.5; 9.0.0 before 9.0.21; 10.0.0 before 10.0.13; 11.0.0; 11.0.0; 11.0.0; +5 more · source: NVD
NF
.net Framework · Microsoft
4.8.1; 4.8; 4.6.2; 4.7; 4.7.1; 4.7.2; +12 more · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-96958
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-96958
vendor-advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-96958
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